xstate - npm Package Compare versions

Comparing version 4.0.0-7 to 4.0.0-8

dist/xstate.graph.js

@@ -1,1 +0,1 @@
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u=a.path,c=a,f=0,h=r.slice(u.length);f<h.length;f++){var p=h[f];c=c.getStateNode(p),n.exit.unshift(c)}a===this&&(e||(n.exit.push(this),n.entry.push(this))),c=a;for(var y=0,v=i.slice(u.length);y<v.length;y++){p=v[y];c=c.getStateNode(p),n.entry.push(c)}return{entry:new Set(n.entry),exit:new Set(n.exit)}},t.prototype.evaluateCond=function(t,e,n,r){var i,a=this.machine.options.guards;if("string"==typeof t){if(!a||!a[t])throw new Error("Condition '"+t+"' is not implemented on machine '"+this.machine.id+"'.");i=a[t]}else i=t;return i(e,n,r)},Object.defineProperty(t.prototype,"delays",{get:function(){var t=this;return Array.from(new Set(this.after.map(function(t){return t.delay}))).map(function(e){return{id:t.id,delay:e}})},enumerable:!0,configurable:!0}),t.prototype.getActions=function(t){var e=this,n=new Set,r={entry:t.entryExitStates?m(Array.from(t.entryExitStates.entry).map(function(r){if("final"===r.type){var i=e.getStateNodeValueTree(t.value);n.add(T(r.id));var a=r.parent?r.parent.parent:void 0;if(a){var s=v(a.path,"value")(i);Object.keys(s.value).every(function(t){return Object.keys(s.value[t].value).every(function(e){return"final"===s.value[t].value[e].stateNode.type})})&&n.add(T(s.stateNode.id))}}return r.onEntry.concat(r.activities.map(function(t){return J(t)}),r.delays.map(function(t){var e,n,r=t.delay,i=t.id;return e=R(r,i),n={delay:r},{type:O,event:N(e),delay:n?n.delay:void 0,id:n&&void 0!==n.id?n.id:o(e)}}))})).concat(Array.from(n).map(_)):[],exit:t.entryExitStates?m(Array.from(t.entryExitStates.exit).map(function(t){return t.onExit.concat(t.activities.map(function(t){return function(t){var e=P(t);return{type:l.Stop,activity:e,exec:e.stop?e.stop.exec:void 0}}(t)}),t.delays.map(function(t){var e,n=t.delay,r=t.id;return e=R(n,r),{type:j,sendId:e}}))})):[]};return r.exit.concat(t.actions).concat(r.entry).map(function(t){return"string"==typeof t?e.resolveAction(t):t})},t.prototype.resolveAction=function(t){var e=this.machine.options.actions;return(e?e[t]:t)||t},t.prototype.resolveActivity=function(t){var n=this.machine.options.activities;return"string"==typeof t?P(n?e({type:t},n[t]):t):t},t.prototype.getActivities=function(t,n){if(!t)return I;var r=e({},n);return Array.from(t.exit).forEach(function(t){t.activities&&t.activities.forEach(function(t){r[t.type]=!1})}),Array.from(t.entry).forEach(function(t){t.activities&&t.activities.forEach(function(t){r[t.type]=!0})}),r},t.prototype.transition=function(t,e,n){var r="string"==typeof t?this.resolve(f(this.getResolvedPath(t))):t instanceof a?t:this.resolve(t),i=n||(t instanceof a?t.context:void 0),o=N(e),s=o.type;if(this.strict&&-1===this.events.indexOf(s))throw new Error("Machine '"+this.id+"' does not accept event '"+s+"'");var u=a.from(r,i),c=this._transition(u.value,u,o,i);return this.resolveTransition(c,u,o)},t.prototype.resolveTransition=function(e,n,r){var i,o=n.historyValue?n.historyValue:e.source?this.machine.historyValue(n.value):void 0;try{this.ensureValidPaths(e.paths)}catch(t){throw new Error("Event '"+(r?r.type:"none")+"' leads to an invalid configuration: "+t.message)}var s=this.getActions(e),u=this.getActivities(e.entryExitStates,n.activities),c=s.filter(function(t){return"object"==typeof t&&(t.type===x||t.type===E)}),f=s.filter(function(t){return"object"!=typeof t||t.type!==x&&t.type!==E&&t.type!==w}),h=s.filter(function(t){return"object"==typeof t&&t.type===w}),p=n.context?h.reduce(function(t,e){var n=e.assignment,i={};return"function"==typeof n?i=n(t,r||{type:"xstate.init"}):Object.keys(n).forEach(function(e){var a=n[e];i[e]="function"==typeof a?a(t,r):a}),Object.assign({},t,i)},n.context):n.context,y=e.value?this.getStateNodes(e.value):[];y.some(function(t){return t.transient})&&c.push({type:E});var v=[this].concat(y).reduce(function(t,e){return void 0!==e.data&&(t[e.id]=e.data),t},{}),l=e.value?new a(e.value,p,o?t.updateHistoryValue(o,e.value):void 0,e.source?n:void 0,V(f,this.options.actions),u,v,c):void 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e=B(t)?t.slice("#".length):t;if(e===this.id)return this;var n=this.machine.idMap[e];if(!n)throw new Error("Substate '#"+e+"' does not exist on '"+this.id+"'");return n},t.prototype.getStateNodeByPath=function(t){for(var e=u(t,this.delimiter),n=this;e.length;){var r=e.shift();n=n.getStateNode(r)}return n},t.prototype.resolve=function(t){var e,n=this;if("string"==typeof t){var r=this.getStateNode(t);return r.initial?((e={})[t]=r.initialStateValue,e):t}return"parallel"===this.type?h(this.initialStateValue,function(e,r){return e?n.getStateNode(r).resolve(t[r]||e):I}):h(t,function(t,e){return t?n.getStateNode(e).resolve(t):I})},Object.defineProperty(t.prototype,"resolvedStateValue",{get:function(){var t,e,n=this.key;return"parallel"===this.type?((t={})[n]=p(this.states,function(t){return 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Set([i].concat(u?Array.from(u.exit):[]))},actions:c,paths:f}}return a},t.prototype.transitionNestedNode=function(t,e,n,r){var i=Object.keys(t),a=this.getStateNode(i[0]),o=a._transition(t[i[0]],e,n,r);if(!o.value){var s=this.next(e,n,r),u=s.value,c=s.entryExitStates,f=s.actions,h=s.paths;return{value:u,source:e,entryExitStates:{entry:c?c.entry:new Set,exit:new Set((o.entryExitStates?Array.from(o.entryExitStates.exit):[]).concat([a],c?Array.from(c.exit):[]))},actions:f,paths:h}}return o},t.prototype.transitionParallelNode=function(t,e,n,r){var i=this,a={};if(Object.keys(t).forEach(function(o){var s=t[o];if(s){var u=i.getStateNode(o)._transition(s,e,n,r);u.value,a[o]=u}}),!Object.keys(a).some(function(t){return void 0!==a[t].value})){var o=this.next(e,n,r),s=o.value,u=o.entryExitStates,c=o.actions,h=o.paths;return{value:s,source:e,entryExitStates:{entry:u?u.entry:new Set,exit:new Set(Object.keys(this.states).map(function(t){return i.states[t]}).concat(u?Array.from(u.exit):[]))},actions:c,paths:h}}var p=m(Object.keys(a).map(function(t){return a[t].paths}));if(1===p.length&&!b(f(this.path),f(p[0])))return{value:this.machine.resolve(g(p)),source:e,entryExitStates:Object.keys(a).map(function(t){return a[t].entryExitStates}).reduce(function(t,e){var n=e,r=n.entry,i=n.exit;return{entry:new Set(Array.from(t.entry).concat(Array.from(r))),exit:new Set(Array.from(t.exit).concat(Array.from(i)))}},{entry:new Set,exit:new Set}),actions:m(Object.keys(a).map(function(t){return a[t].actions})),paths:p};var v=m(Object.keys(a).map(function(t){var n=a[t].value||e.value;return d(y(i.path)(n)[t]).map(function(e){return i.path.concat(t,e)})})),l=this.machine.resolve(g(v));return{value:l,source:e,entryExitStates:Object.keys(a).reduce(function(t,e){var n=a[e],r=n.value,i=n.entryExitStates;if(!r||!i)return t;var o=i.entry,s=i.exit;return{entry:new Set(Array.from(t.entry).concat(Array.from(o))),exit:new Set(Array.from(t.exit).concat(Array.from(s)))}},{entry:new Set,exit:new Set}),actions:m(Object.keys(a).map(function(t){return a[t].actions})),paths:d(l)}},t.prototype._transition=function(t,e,n,r){return"string"==typeof t?this.transitionLeafNode(t,e,n,r):1===Object.keys(t).length?this.transitionNestedNode(t,e,n,r):this.transitionParallelNode(t,e,n,r)},t.prototype.next=function(t,e,n){var r=this,i=e.type,a=this.on[i],o=this.transient?[{type:E}]:[];if(!a||!a.length)return{value:void 0,source:t,entryExitStates:void 0,actions:o,paths:[]};for(var s,u=[],f=0,h=a;f<h.length;f++){var p=h[f],v=p,l=v.cond,d=v.in,x=n||C,O=!d||b(c(d,this.delimiter),y(this.path.slice(0,-2))(t.value));if((!l||this.evaluateCond(l,x,e,t.value))&&O){u=S(p.target),o.push.apply(o,S(p.actions)),s=p;break}}if(s&&0===u.length)return{value:t.value,source:t,entryExitStates:void 0,actions:o,paths:[]};if(!s&&0===u.length)return{value:void 0,source:t,entryExitStates:void 0,actions:o,paths:[]};var j=m(u.map(function(e){return r.getRelativeStateNodes(e,t.historyValue)})),w=j.map(function(t){return t.path}),N=j.reduce(function(t,e){var n=r.getEntryExitStates(e,!!s.internal),i=n.entry,a=n.exit;return{entry:new Set(Array.from(t.entry).concat(Array.from(i))),exit:new Set(Array.from(t.exit).concat(Array.from(a)))}},{entry:new Set,exit:new Set});return{value:this.machine.resolve(g(m(u.map(function(e){return r.getRelativeStateNodes(e,t.historyValue).map(function(t){return t.path})})))),source:t,entryExitStates:N,actions:o,paths:w}},t.prototype.getStateNodeValueTree=function(t){var e,n=this;return"string"==typeof t?{stateNode:this,value:(e={},e[t]={stateNode:this.getStateNode(t),value:void 0},e)}:{stateNode:this,value:h(t,function(t,e){return n.getStateNode(e).getStateNodeValueTree(t)})}},t.prototype.getEntryExitStates=function(t,e){for(var n={entry:[],exit:[]},r=this.path,i=t.path,a=this.machine,o=0;o<Math.min(r.length,i.length);o++){var s=r[o];if(s!==i[o])break;a=a.getStateNode(s)}for(var u=a.path,c=a,f=0,h=r.slice(u.length);f<h.length;f++){var p=h[f];c=c.getStateNode(p),n.exit.unshift(c)}a===this&&(e||(n.exit.push(this),n.entry.push(this))),c=a;for(var y=0,v=i.slice(u.length);y<v.length;y++){p=v[y];c=c.getStateNode(p),n.entry.push(c)}return{entry:new Set(n.entry),exit:new Set(n.exit)}},t.prototype.evaluateCond=function(t,e,n,r){var i,a=this.machine.options.guards;if("string"==typeof t){if(!a||!a[t])throw new Error("Condition '"+t+"' is not implemented on machine '"+this.machine.id+"'.");i=a[t]}else i=t;return i(e,n,r)},Object.defineProperty(t.prototype,"delays",{get:function(){var t=this;return Array.from(new Set(this.after.map(function(t){return t.delay}))).map(function(e){return{id:t.id,delay:e}})},enumerable:!0,configurable:!0}),t.prototype.getActions=function(t){var e=this,n=new Set,r={entry:t.entryExitStates?m(Array.from(t.entryExitStates.entry).map(function(r){if("final"===r.type){var i=e.getStateNodeValueTree(t.value);n.add(T(r.id));var a=r.parent?r.parent.parent:void 0;if(a){var s=v(a.path,"value")(i);Object.keys(s.value).every(function(t){return Object.keys(s.value[t].value).every(function(e){return"final"===s.value[t].value[e].stateNode.type})})&&n.add(T(s.stateNode.id))}}return r.onEntry.concat(r.activities.map(function(t){return J(t)}),r.delays.map(function(t){var e,n,r=t.delay,i=t.id;return e=R(r,i),n={delay:r},{type:O,event:N(e),delay:n?n.delay:void 0,id:n&&void 0!==n.id?n.id:o(e)}}))})).concat(Array.from(n).map(_)):[],exit:t.entryExitStates?m(Array.from(t.entryExitStates.exit).map(function(t){return t.onExit.concat(t.activities.map(function(t){return function(t){var e=P(t);return{type:l.Stop,activity:e,exec:e.stop?e.stop.exec:void 0}}(t)}),t.delays.map(function(t){var e,n=t.delay,r=t.id;return e=R(n,r),{type:j,sendId:e}}))})):[]};return r.exit.concat(t.actions).concat(r.entry).map(function(t){return"string"==typeof t?e.resolveAction(t):t})},t.prototype.resolveAction=function(t){var e=this.machine.options.actions;return(e?e[t]:t)||t},t.prototype.resolveActivity=function(t){var n=this.machine.options.activities;return"string"==typeof t?P(n?e({type:t},n[t]):t):t},t.prototype.getActivities=function(t,n){if(!t)return C;var r=e({},n);return Array.from(t.exit).forEach(function(t){t.activities&&t.activities.forEach(function(t){r[t.type]=!1})}),Array.from(t.entry).forEach(function(t){t.activities&&t.activities.forEach(function(t){r[t.type]=!0})}),r},t.prototype.transition=function(t,e,n){var r="string"==typeof t?this.resolve(f(this.getResolvedPath(t))):t instanceof a?t:this.resolve(t),i=n||(t instanceof a?t.context:void 0),o=N(e),s=o.type;if(this.strict&&-1===this.events.indexOf(s))throw new Error("Machine '"+this.id+"' does not accept event '"+s+"'");var u=a.from(r,i),c=this._transition(u.value,u,o,i);return this.resolveTransition(c,u,o)},t.prototype.resolveTransition=function(e,n,r){var i,o=n.historyValue?n.historyValue:e.source?this.machine.historyValue(n.value):void 0,s=this.getActions(e),u=this.getActivities(e.entryExitStates,n.activities),c=s.filter(function(t){return"object"==typeof t&&(t.type===x||t.type===E)}),f=s.filter(function(t){return"object"!=typeof t||t.type!==x&&t.type!==E&&t.type!==w}),h=s.filter(function(t){return"object"==typeof t&&t.type===w}),p=n.context?h.reduce(function(t,e){var n=e.assignment,i={};return"function"==typeof n?i=n(t,r||{type:l.Init}):Object.keys(n).forEach(function(e){var a=n[e];i[e]="function"==typeof a?a(t,r):a}),Object.assign({},t,i)},n.context):n.context,y=e.value?this.getStateNodes(e.value):[];y.some(function(t){return t.transient})&&c.push({type:E});var v=[this].concat(y).reduce(function(t,e){return void 0!==e.data&&(t[e.id]=e.data),t},{}),d=e.value?new a(e.value,p,o?t.updateHistoryValue(o,e.value):void 0,e.source?n:void 0,V(f,this.options.actions),u,v,c):void 0;if(!d)return a.inert(n,p);n.history&&delete n.history.history;for(var g=d;c.length;){var m=g.actions,S=c.shift();(i=(g=this.transition(g,S.type===E?I:S.event,g.context)).actions).unshift.apply(i,m)}return g},t.prototype.ensureValidPaths=function(t){var e=this,n=new Map;t:for(var r=0,i=m(t.map(function(t){return e.getRelativeStateNodes(t)}));r<i.length;r++)for(var a=i[r],o=a;o.parent;){if(n.has(o.parent)){if("parallel"===o.parent.type)continue t;throw new Error("State node '"+a.id+"' shares parent '"+o.parent.id+"' with state node '"+n.get(o.parent).map(function(t){return t.id})+"'")}n.get(o.parent)?n.get(o.parent).push(a):n.set(o.parent,[a]),o=o.parent}},t.prototype.getStateNode=function(t){if(B(t))return this.machine.getStateNodeById(t);if(!this.states)throw new Error("Unable to retrieve child state '"+t+"' from '"+this.id+"'; no child states exist.");var e=this.states[t];if(!e)throw new Error("Child state '"+t+"' does not exist on '"+this.id+"'");return e},t.prototype.getStateNodeById=function(t){var e=B(t)?t.slice("#".length):t;if(e===this.id)return this;var n=this.machine.idMap[e];if(!n)throw new Error("Substate '#"+e+"' does not exist on '"+this.id+"'");return n},t.prototype.getStateNodeByPath=function(t){for(var e=u(t,this.delimiter),n=this;e.length;){var r=e.shift();n=n.getStateNode(r)}return n},t.prototype.resolve=function(t){var e,n=this;if("string"==typeof t){var r=this.getStateNode(t);return r.initial?((e={})[t]=r.initialStateValue,e):t}return"parallel"===this.type?h(this.initialStateValue,function(e,r){return e?n.getStateNode(r).resolve(t[r]||e):C}):h(t,function(t,e){return t?n.getStateNode(e).resolve(t):C})},Object.defineProperty(t.prototype,"resolvedStateValue",{get:function(){var t,e,n=this.key;return"parallel"===this.type?((t={})[n]=p(this.states,function(t){return t.resolvedStateValue[t.key]},function(t){return!t.history}),t):this.initial?((e={})[n]=this.states[this.initial].resolvedStateValue,e):n},enumerable:!0,configurable:!0}),t.prototype.getResolvedPath=function(t){if(B(t)){var e=this.machine.idMap[t.slice("#".length)];if(!e)throw new Error("Unable to find state node '"+t+"'");return e.path}return u(t,this.delimiter)},Object.defineProperty(t.prototype,"initialStateValue",{get:function(){if(this.__cache.initialState)return this.__cache.initialState;var t="parallel"===this.type?p(this.states,function(t){return t.initialStateValue||C},function(t){return!t.history}):"string"==typeof this.resolvedStateValue?void 0:this.resolvedStateValue[this.key];return this.__cache.initialState=t,this.__cache.initialState},enumerable:!0,configurable:!0}),t.prototype.getState=function(t,e){var n=this;void 0===e&&(e=this.machine.context);var r={},i=[];this.getStateNodes(t).forEach(function(t){t.onEntry&&i.push.apply(i,t.onEntry),t.activities&&t.activities.forEach(function(t){r[o(t)]=!0,i.push(J(t))})});var s=i.filter(function(t){return"object"==typeof t&&(t.type===x||t.type===E)}),u=i.filter(function(t){return"object"==typeof t&&t.type===w}),c=e?u.reduce(function(t,e){var n=e.assignment,r={};return"function"==typeof n?r=n(t,{type:"init"}):Object.keys(n).forEach(function(e){var i=n[e];r[e]="function"==typeof i?i(t,{type:"init"}):i}),Object.assign({},t,r)},e):e,f=new a(t,c,void 0,void 0,V(i,this.options.actions),r,void 0,[]);return s.reduce(function(t,e){var r,i=t.actions;return(r=(t=n.transition(t,e.type===E?I:e.event,t.context)).actions).unshift.apply(r,i),t},f)},Object.defineProperty(t.prototype,"initialState",{get:function(){var t=this.initialStateValue;if(!t)throw new Error("Cannot retrieve initial state from simple state '"+this.id+"'.");var e=this.getState(t);return this.resolveTransition({value:e.value,source:void 0,entryExitStates:{entry:new Set(this.getStateNodes(e.value)),exit:new Set},actions:[],paths:[]},e)},enumerable:!0,configurable:!0}),Object.defineProperty(t.prototype,"target",{get:function(){var t;if(this.history){var e=this.config;t=e.target&&"string"==typeof e.target&&B(e.target)?f(this.machine.getStateNodeById(e.target).path.slice(this.path.length-1)):e.target}return t},enumerable:!0,configurable:!0}),t.prototype.getStates=function(t){var e=this;if("string"==typeof t)return[this.states[t]];var n=[];return Object.keys(t).forEach(function(r){n.push.apply(n,e.states[r].getStates(t[r]))}),n},t.prototype.getRelativeStateNodes=function(t,e,n){if(void 0===n&&(n=!0),"string"==typeof t&&B(t)){var r=this.getStateNodeById(t);return n?r.history?r.resolveHistory(e):r.initialStateNodes:[r]}var i=u(t,this.delimiter),a=(this.parent||this).getFromRelativePath(i,e);return n?m(a.map(function(t){return t.initialStateNodes})):a},Object.defineProperty(t.prototype,"initialStateNodes",{get:function(){var t=this;if("atomic"===this.type||"final"===this.type)return[this];var e=this.initialStateValue;return m(d(e).map(function(e){return t.getFromRelativePath(e)}))},enumerable:!0,configurable:!0}),t.prototype.getFromRelativePath=function(t,e){if(!t.length)return[this];var n=t[0],r=t.slice(1);if(!this.states)throw new Error("Cannot retrieve subPath '"+n+"' from node with no states");var i=this.getStateNode(n);if(i.history)return i.resolveHistory(e);if(!this.states[n])throw new Error("Child state '"+n+"' does not exist on '"+this.id+"'");return this.states[n].getFromRelativePath(r,e)},t.updateHistoryValue=function(t,e){return{current:e,states:function t(e,n){return h(e.states,function(e,r){if(e){var i=("string"==typeof n?void 0:n[r])||(e?e.current:void 0);if(i)return{current:i,states:t(e,i)}}})}(t,e)}},t.prototype.historyValue=function(t){if(Object.keys(this.states).length)return{current:t||this.initialStateValue,states:p(this.states,function(e,n){if(!t)return e.historyValue();var r="string"==typeof t?void 0:t[n];return e.historyValue(r||e.initialStateValue)},function(t){return!t.history})}},t.prototype.resolveHistory=function(t){var e=this;if(!this.history)return[this];var n=this.parent;if(!t)return this.target?m(d(this.target).map(function(t){return n.getFromRelativePath(t)})):this.parent.initialStateNodes;var r=v(n.path,"states")(t).current;return"string"==typeof r?[n.getStateNode(r)]:m(d(r).map(function(t){return"deep"===e.history?n.getFromRelativePath(t):[n.states[t[0]]]}))},Object.defineProperty(t.prototype,"stateIds",{get:function(){var t=this,e=m(Object.keys(this.states).map(function(e){return t.states[e].stateIds}));return[this.id].concat(e)},enumerable:!0,configurable:!0}),Object.defineProperty(t.prototype,"events",{get:function(){if(this.__cache.events)return this.__cache.events;var t=this.states,e=new Set(Object.keys(this.on));return t&&Object.keys(t).forEach(function(n){var r=t[n];if(r.states)for(var i=0,a=r.events;i<a.length;i++){var o=a[i];e.add(""+o)}}),this.__cache.events=Array.from(e)},enumerable:!0,configurable:!0}),t.prototype.formatTransition=function(t,n,r){var i=this,a=!!n&&n.internal;if(void 0===t||""===t)return e({},n,{actions:n?S(n.actions):[],target:void 0,internal:!n||(void 0===n.internal||n.internal),event:r});var o=S(t).map(function(t){var e="string"==typeof t&&t[0]===i.delimiter;return a=a||e,e&&!i.parent?t.slice(1):e?i.key+t:t});return e({},n,{actions:n?S(n.actions):[],target:o,internal:a,event:r})},t.prototype.formatTransitions=function(){var t=this,e=this.config.on||C,n=this.after,r=h(e,function(e,n){return void 0===e?[{target:void 0,event:n,actions:[]}]:Array.isArray(e)?e.map(function(e){return t.formatTransition(e.target,e,n)}):"string"==typeof e?[t.formatTransition([e],void 0,n)]:[t.formatTransition(e.target,e,n)]});return n.forEach(function(t){r[t.event]=r[t.event]||[],r[t.event].push(t)}),r}}(),{});function D(t,e){return m(t.definition.on[e].map(function(n){var r=n.target?[].concat(n.target):void 0;return r?r.map(function(r){try{var i=r?t.getRelativeStateNodes(r,void 0,!1)[0]:t;return{source:t,target:i,event:e,actions:n.actions?n.actions.map(s):[],cond:n.cond,transition:n}}catch(e){return void console.warn("Target '"+r+"' not found on '"+t.id+"'")}}).filter(function(t){return void 0!==t}):[{source:t,target:t,event:e,actions:n.actions?n.actions.map(s):[],cond:n.cond,transition:n}]}))}function U(t,e){var n={},r=t.events;return function i(a){var o=JSON.stringify(a);if(!n[o]){n[o]={};for(var s=0,u=r;s<u.length;s++){var c=u[s],f=t.transition(a,c,e);n[o][c]={state:f.value},i(f.value)}}}(t.initialState.value),n}function z(t){if("string"==typeof t||"number"==typeof t)return""+t;var e=t.type,r=n(t,["type"]);return e+" | "+JSON.stringify(r)}function G(t){var e=t.value,n=t.context;return JSON.stringify(e)+" | "+JSON.stringify(n)}function q(t,e){var n=e.events,r=e.filter,i={},a=m(t.events.map(function(t){return n[t]||[t]}));return function e(n){var o=G(n);if(!i[o]){i[o]={};for(var s=0,u=a;s<u.length;s++){var c=u[s],f=t.transition(n,c);r&&!r(f)||(i[o][z(c)]={value:f.value,context:f.context},e(f))}}}(t.initialState),i}function K(t,e){var n;if(!t.states)return L;var r=U(t,e),i=((n={})[JSON.stringify(t.initialState.value)]=[],n),a=new Set;return function e(n){var o=JSON.stringify(n);a.add(o);for(var s=r[o],u=0,f=Object.keys(s);u<f.length;u++){var h=f[u];if(l=s[h].state){var p=JSON.stringify(c(l,t.delimiter));(!i[p]||i[p].length>i[o].length+1)&&(i[p]=(i[o]||[]).concat([{state:n,event:h}]))}}for(var y=0,v=Object.keys(s);y<v.length;y++){var l;(l=s[v[y]].state)&&(p=JSON.stringify(l),a.has(p)||e(l))}return i}(t.initialState.value),i}function Q(t,e){if(!t.states)return L;var n=U(t,e),r=new Set,i=[],a={};var o=JSON.stringify(t.initialState.value);return Object.keys(n).forEach(function(t){!function t(e,o){if(r.add(e),e===o)a[o]=a[o]||[],a[o].push(i.slice());else for(var s=0,u=Object.keys(n[e]);s<u.length;s++){var c=u[s],f=n[e][c].state;if(f){var h=JSON.stringify(f);r.has(h)||(i.push({state:JSON.parse(e),event:c}),t(h,o))}}i.pop(),r.delete(e)}(o,t)}),a}t.getNodes=function t(e){var n=e.states;return Object.keys(n).reduce(function(e,r){var i=n[r],a=t(n[r]);return e.push.apply(e,[i].concat(a)),e},[])},t.getEventEdges=D,t.getEdges=function t(e,n){var r=(n||{}).depth,i=void 0===r?null:r,a=[];return e.states&&null===i?Object.keys(e.states).forEach(function(n){a.push.apply(a,t(e.states[n]))}):i&&i>0&&Object.keys(e.states).forEach(function(n){a.push.apply(a,t(e.states[n],{depth:i-1}))}),Object.keys(e.on).forEach(function(t){a.push.apply(a,D(e,t))}),a},t.getAdjacencyMap=U,t.deserializeStateString=function(t){var e=t.split(" | "),n=e[0],r=e[1];return{value:JSON.parse(n),context:JSON.parse(r)}},t.getValueAdjacencyMap=q,t.getShortestValuePaths=function(t,e){if(!t.states)return L;var n=q(t,e),r={},i=new Set;return function t(e){var o=G(e);i.add(o);for(var s=n[o],u=0,c=Object.keys(s);u<c.length;u++){var f=c[u],h=s[f],p=h.value,y=h.context;if(p){var v=G(S=a.from(p,y));(!r[v]||r[v].length>r[o].length+1)&&(r[v]=(r[o]||[]).concat([{state:p,event:f}]))}}for(var l=0,d=Object.keys(s);l<d.length;l++){var g=s[d[l]],m=(p=g.value,g.context);if(p){var S=a.from(p,m);v=G(a.from(p,m)),i.has(v)||t(S)}}return r}(t.initialState),r},t.getShortestPaths=K,t.getShortestPathsAsArray=function(t,e){var n=K(t,e);return Object.keys(n).map(function(t){return{state:JSON.parse(t),path:n[t]}})},t.getSimplePaths=Q,t.getSimplePathsAsArray=function(t,e){var n=Q(t,e);return Object.keys(n).map(function(t){return{state:JSON.parse(t),paths:n[t]}})},Object.defineProperty(t,"__esModule",{value:!0})});

dist/xstate.interpreter.js

@@ -1,1 +0,1 @@
-!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?e(exports):"function"==typeof define&&define.amd?define(["exports"],e):e(t.xstateInterpreter={})}(this,function(t){"use strict";var e,n=function(){return(n=Object.assign||function(t){for(var e,n=1,r=arguments.length;n<r;n++)for(var i in e=arguments[n])Object.prototype.hasOwnProperty.call(e,i)&&(t[i]=e[i]);return t}).apply(this,arguments)};!function(t){t.Start="xstate.start",t.Stop="xstate.stop",t.Raise="xstate.raise",t.Send="xstate.send",t.Cancel="xstate.cancel",t.Null="xstate.null",t.Assign="xstate.assign",t.After="xstate.after",t.DoneState="done.state",t.Log="xstate.log"}(e||(e={}));e.Start,e.Stop;var r=e.Raise,i=e.Send,o=e.Cancel,a=e.Null,s=e.Assign,u=(e.After,e.DoneState,e.Log),c=".",h={};function f(t,e,n){void 0===n&&(n=c);var r=b(t,n),i=b(e,n);return"string"==typeof i?"string"==typeof r&&i===r:"string"==typeof r?r in i:Object.keys(r).every(function(t){return t in i&&f(r[t],i[t])})}var p=".",l="",y={},v=[],d=function(t){return"#"===t[0]},g=function(){return{guards:y}},m=(function(){function t(e,r,i){void 0===r&&(r=g());var o=this;this._config=e,this.options=r,this.context=i,this.__cache={events:void 0,relativeValue:new Map,initialState:void 0},this.idMap={},this.key=e.key||e.id||"(machine)",this.type=e.type||(e.parallel?"parallel":e.states&&Object.keys(e.states).length?"compound":e.history?"history":"atomic"),this.parent=e.parent,this.machine=this.parent?this.parent.machine:this,this.path=this.parent?this.parent.path.concat(this.key):[],this.delimiter=e.delimiter||(this.parent?this.parent.delimiter:p),this.id=e.id||(this.machine?[this.machine.key].concat(this.path).join(this.delimiter):this.key),this.initial=e.initial,this.order=e.order||-1,this.states=e.states?E(e.states,function(e,r,i,a){var s,u=new t(n({},e,{key:r,order:void 0===e.order?e.order:a,parent:o}));return Object.assign(o.idMap,n(((s={})[u.id]=u,s),u.idMap)),u}):y,this.history=!0===e.history?"shallow":e.history||!1,this.transient=!(!e.on||!e.on[l]),this.strict=!!e.strict,this.onEntry=V(e.onEntry),this.onExit=V(e.onExit),this.data=e.data,this.activities=V(e.activities).map(function(t){return o.resolveActivity(t)})}Object.defineProperty(t.prototype,"definition",{get:function(){return{id:this.id,key:this.key,type:this.type,initial:this.initial,history:this.history,states:E(this.states,function(t){return t.definition}),on:this.on,onEntry:this.onEntry,onExit:this.onExit,after:this.after,activities:this.activities||v,data:this.data,order:this.order||-1}},enumerable:!0,configurable:!0}),Object.defineProperty(t.prototype,"config",{get:function(){var t=this._config;t.parent;return function(t,e){var n={};for(var r in t)Object.prototype.hasOwnProperty.call(t,r)&&e.indexOf(r)<0&&(n[r]=t[r]);if(null!=t&&"function"==typeof Object.getOwnPropertySymbols){var i=0;for(r=Object.getOwnPropertySymbols(t);i<r.length;i++)e.indexOf(r[i])<0&&(n[r[i]]=t[r[i]])}return n}(t,["parent"])},enumerable:!0,configurable:!0}),Object.defineProperty(t.prototype,"on",{get:function(){return this.formatTransitions()},enumerable:!0,configurable:!0}),Object.defineProperty(t.prototype,"after",{get:function(){var t=this,e=this.config.after;if(!e)return v;if(Array.isArray(e))return e.map(function(e){return n({event:B(e.delay,t.id)},e,{actions:V(e.actions)})});var r=P(Object.keys(e).map(function(r){var i=e[r],o=+r,a=B(o,t.id);return"string"==typeof i?[{target:i,delay:o,event:a,actions:[]}]:V(i).map(function(t){return n({event:a,delay:o},t,{actions:V(t.actions)})})}));return r.sort(function(t,e){return t.delay-e.delay}),r},enumerable:!0,configurable:!0}),t.prototype.getStateNodes=function(t){var e,n=this;if(!t)return[];var r=t instanceof m?t.value:b(t,this.delimiter);if("string"==typeof r){var i=this.getStateNode(r).initial;return i?this.getStateNodes(((e={})[r]=i,e)):[this.states[r]]}var o=Object.keys(r);return o.map(function(t){return n.getStateNode(t)}).concat(o.reduce(function(t,e){var i=n.getStateNode(e).getStateNodes(r[e]);return t.concat(i)},[]))},t.prototype.handles=function(t){var e=S(t);return-1!==this.events.indexOf(e)},t.prototype.transitionLeafNode=function(t,e,n,r){var i=this.getStateNode(t),o=i.next(e,n,r);if(!o.value){var a=this.next(e,n,r),s=a.value,u=a.entryExitStates,c=a.actions,h=a.paths;return{value:s,source:e,entryExitStates:{entry:u?u.entry:new Set,exit:new Set([i].concat(u?Array.from(u.exit):[]))},actions:c,paths:h}}return o},t.prototype.transitionNestedNode=function(t,e,n,r){var i=Object.keys(t),o=this.getStateNode(i[0]),a=o._transition(t[i[0]],e,n,r);if(!a.value){var s=this.next(e,n,r),u=s.value,c=s.entryExitStates,h=s.actions,f=s.paths;return{value:u,source:e,entryExitStates:{entry:c?c.entry:new Set,exit:new Set((a.entryExitStates?Array.from(a.entryExitStates.exit):[]).concat([o],c?Array.from(c.exit):[]))},actions:h,paths:f}}return a},t.prototype.transitionParallelNode=function(t,e,n,r){var i=this,o={};if(Object.keys(t).forEach(function(a){var s=t[a];if(s){var u=i.getStateNode(a)._transition(s,e,n,r);u.value,o[a]=u}}),!Object.keys(o).some(function(t){return void 0!==o[t].value})){var a=this.next(e,n,r),s=a.value,u=a.entryExitStates,c=a.actions,h=a.paths;return{value:s,source:e,entryExitStates:{entry:u?u.entry:new Set,exit:new Set(Object.keys(this.states).map(function(t){return i.states[t]}).concat(u?Array.from(u.exit):[]))},actions:c,paths:h}}var p=P(Object.keys(o).map(function(t){return o[t].paths}));if(1===p.length&&!f(w(this.path),w(p[0])))return{value:this.machine.resolve(A(p)),source:e,entryExitStates:Object.keys(o).map(function(t){return o[t].entryExitStates}).reduce(function(t,e){var n=e,r=n.entry,i=n.exit;return{entry:new Set(Array.from(t.entry).concat(Array.from(r))),exit:new Set(Array.from(t.exit).concat(Array.from(i)))}},{entry:new Set,exit:new Set}),actions:P(Object.keys(o).map(function(t){return o[t].actions})),paths:p};var l=P(Object.keys(o).map(function(t){var n=o[t].value||e.value;return k(j(i.path)(n)[t]).map(function(e){return i.path.concat(t,e)})})),y=this.machine.resolve(A(l));return{value:y,source:e,entryExitStates:Object.keys(o).reduce(function(t,e){var n=o[e],r=n.value,i=n.entryExitStates;if(!r||!i)return t;var a=i.entry,s=i.exit;return{entry:new Set(Array.from(t.entry).concat(Array.from(a))),exit:new Set(Array.from(t.exit).concat(Array.from(s)))}},{entry:new Set,exit:new Set}),actions:P(Object.keys(o).map(function(t){return o[t].actions})),paths:k(y)}},t.prototype._transition=function(t,e,n,r){return"string"==typeof t?this.transitionLeafNode(t,e,n,r):1===Object.keys(t).length?this.transitionNestedNode(t,e,n,r):this.transitionParallelNode(t,e,n,r)},t.prototype.next=function(t,e,n){var r=this,i=e.type,o=this.on[i],s=this.transient?[{type:a}]:[];if(!o||!o.length)return{value:void 0,source:t,entryExitStates:void 0,actions:s,paths:[]};for(var u,c=[],h=0,p=o;h<p.length;h++){var l=p[h],v=l,d=v.cond,g=v.in,m=n||y,S=!g||f(b(g,this.delimiter),j(this.path.slice(0,-2))(t.value));if((!d||this.evaluateCond(d,m,e,t.value))&&S){c=V(l.target),s.push.apply(s,V(l.actions)),u=l;break}}if(u&&0===c.length)return{value:t.value,source:t,entryExitStates:void 0,actions:s,paths:[]};if(!u&&0===c.length)return{value:void 0,source:t,entryExitStates:void 0,actions:s,paths:[]};var x=P(c.map(function(e){return r.getRelativeStateNodes(e,t.historyValue)})),w=x.map(function(t){return t.path}),E=x.reduce(function(t,e){var n=r.getEntryExitStates(e,!!u.internal),i=n.entry,o=n.exit;return{entry:new Set(Array.from(t.entry).concat(Array.from(i))),exit:new Set(Array.from(t.exit).concat(Array.from(o)))}},{entry:new Set,exit:new Set});return{value:this.machine.resolve(A(P(c.map(function(e){return r.getRelativeStateNodes(e,t.historyValue).map(function(t){return t.path})})))),source:t,entryExitStates:E,actions:s,paths:w}},t.prototype.getStateNodeValueTree=function(t){var e,n=this;return"string"==typeof t?{stateNode:this,value:(e={},e[t]={stateNode:this.getStateNode(t),value:void 0},e)}:{stateNode:this,value:E(t,function(t,e){return n.getStateNode(e).getStateNodeValueTree(t)})}},t.prototype.getEntryExitStates=function(t,e){for(var n={entry:[],exit:[]},r=this.path,i=t.path,o=this.machine,a=0;a<Math.min(r.length,i.length);a++){var s=r[a];if(s!==i[a])break;o=o.getStateNode(s)}for(var u=o.path,c=o,h=0,f=r.slice(u.length);h<f.length;h++){var p=f[h];c=c.getStateNode(p),n.exit.unshift(c)}o===this&&(e||(n.exit.push(this),n.entry.push(this))),c=o;for(var l=0,y=i.slice(u.length);l<y.length;l++){p=y[l];c=c.getStateNode(p),n.entry.push(c)}return{entry:new Set(n.entry),exit:new Set(n.exit)}},t.prototype.evaluateCond=function(t,e,n,r){var i,o=this.machine.options.guards;if("string"==typeof t){if(!o||!o[t])throw new Error("Condition '"+t+"' is not implemented on machine '"+this.machine.id+"'.");i=o[t]}else i=t;return i(e,n,r)},Object.defineProperty(t.prototype,"delays",{get:function(){var t=this;return Array.from(new Set(this.after.map(function(t){return t.delay}))).map(function(e){return{id:t.id,delay:e}})},enumerable:!0,configurable:!0}),t.prototype.getActions=function(t){var n=this,r=new Set,i={entry:t.entryExitStates?P(Array.from(t.entryExitStates.entry).map(function(e){if("final"===e.type){var i=n.getStateNodeValueTree(t.value);r.add(H(e.id));var o=e.parent?e.parent.parent:void 0;if(o){var a=N(o.path,"value")(i);Object.keys(a.value).every(function(t){return Object.keys(a.value[t].value).every(function(e){return"final"===a.value[t].value[e].stateNode.type})})&&r.add(H(a.stateNode.id))}}return e.onEntry.concat(e.activities.map(function(t){return Q(t)}),e.delays.map(function(t){var e=t.delay,n=t.id;return L(B(e,n),{delay:e})}))})).concat(Array.from(r).map(C)):[],exit:t.entryExitStates?P(Array.from(t.entryExitStates.exit).map(function(t){return t.onExit.concat(t.activities.map(function(t){return function(t){var n=R(t);return{type:e.Stop,activity:n,exec:n.stop?n.stop.exec:void 0}}(t)}),t.delays.map(function(t){var e=t.delay,n=t.id;return F(B(e,n))}))})):[]};return i.exit.concat(t.actions).concat(i.entry).map(function(t){return"string"==typeof t?n.resolveAction(t):t})},t.prototype.resolveAction=function(t){var e=this.machine.options.actions;return(e?e[t]:t)||t},t.prototype.resolveActivity=function(t){var e=this.machine.options.activities;return"string"==typeof t?R(e?n({type:t},e[t]):t):t},t.prototype.getActivities=function(t,e){if(!t)return y;var r=n({},e);return Array.from(t.exit).forEach(function(t){t.activities&&t.activities.forEach(function(t){r[t.type]=!1})}),Array.from(t.entry).forEach(function(t){t.activities&&t.activities.forEach(function(t){r[t.type]=!0})}),r},t.prototype.transition=function(t,e,n){var r="string"==typeof t?this.resolve(w(this.getResolvedPath(t))):t instanceof m?t:this.resolve(t),i=n||(t instanceof m?t.context:void 0),o=_(e),a=o.type;if(this.strict&&-1===this.events.indexOf(a))throw new Error("Machine '"+this.id+"' does not accept event '"+a+"'");var s=m.from(r,i),u=this._transition(s.value,s,o,i);return this.resolveTransition(u,s,o)},t.prototype.resolveTransition=function(e,n,i){var o,u=n.historyValue?n.historyValue:e.source?this.machine.historyValue(n.value):void 0;try{this.ensureValidPaths(e.paths)}catch(t){throw new Error("Event '"+(i?i.type:"none")+"' leads to an invalid configuration: "+t.message)}var c=this.getActions(e),h=this.getActivities(e.entryExitStates,n.activities),f=c.filter(function(t){return"object"==typeof t&&(t.type===r||t.type===a)}),p=c.filter(function(t){return"object"!=typeof t||t.type!==r&&t.type!==a&&t.type!==s}),y=c.filter(function(t){return"object"==typeof t&&t.type===s}),v=n.context?y.reduce(function(t,e){var n=e.assignment,r={};return"function"==typeof n?r=n(t,i||{type:"xstate.init"}):Object.keys(n).forEach(function(e){var o=n[e];r[e]="function"==typeof o?o(t,i):o}),Object.assign({},t,r)},n.context):n.context,d=e.value?this.getStateNodes(e.value):[];d.some(function(t){return t.transient})&&f.push({type:a});var g=[this].concat(d).reduce(function(t,e){return void 0!==e.data&&(t[e.id]=e.data),t},{}),S=e.value?new m(e.value,v,u?t.updateHistoryValue(u,e.value):void 0,e.source?n:void 0,I(p,this.options.actions),h,g,f):void 0;if(!S)return m.inert(n,v);delete n.history;for(var x=S;f.length;){var b=x.actions,w=f.shift();(o=(x=this.transition(x,w.type===a?l:w.event,x.context)).actions).unshift.apply(o,b)}return x},t.prototype.ensureValidPaths=function(t){var e=this,n=new Map;t:for(var r=0,i=P(t.map(function(t){return e.getRelativeStateNodes(t)}));r<i.length;r++)for(var o=i[r],a=o;a.parent;){if(n.has(a.parent)){if("parallel"===a.parent.type)continue t;throw new Error("State node '"+o.id+"' shares parent '"+a.parent.id+"' with state node '"+n.get(a.parent).map(function(t){return t.id})+"'")}n.get(a.parent)?n.get(a.parent).push(o):n.set(a.parent,[o]),a=a.parent}},t.prototype.getStateNode=function(t){if(d(t))return this.machine.getStateNodeById(t);if(!this.states)throw new Error("Unable to retrieve child state '"+t+"' from '"+this.id+"'; no child states exist.");var e=this.states[t];if(!e)throw new Error("Child state '"+t+"' does not exist on '"+this.id+"'");return e},t.prototype.getStateNodeById=function(t){var e=d(t)?t.slice("#".length):t;if(e===this.id)return this;var n=this.machine.idMap[e];if(!n)throw new Error("Substate '#"+e+"' does not exist on '"+this.id+"'");return n},t.prototype.getStateNodeByPath=function(t){for(var e=x(t,this.delimiter),n=this;e.length;){var r=e.shift();n=n.getStateNode(r)}return n},t.prototype.resolve=function(t){var e,n=this;if("string"==typeof t){var r=this.getStateNode(t);return r.initial?((e={})[t]=r.initialStateValue,e):t}return"parallel"===this.type?E(this.initialStateValue,function(e,r){return e?n.getStateNode(r).resolve(t[r]||e):y}):E(t,function(t,e){return t?n.getStateNode(e).resolve(t):y})},Object.defineProperty(t.prototype,"resolvedStateValue",{get:function(){var t,e,n=this.key;return"parallel"===this.type?((t={})[n]=O(this.states,function(t){return t.resolvedStateValue[t.key]},function(t){return!t.history}),t):this.initial?((e={})[n]=this.states[this.initial].resolvedStateValue,e):n},enumerable:!0,configurable:!0}),t.prototype.getResolvedPath=function(t){if(d(t)){var e=this.machine.idMap[t.slice("#".length)];if(!e)throw new Error("Unable to find state node '"+t+"'");return e.path}return x(t,this.delimiter)},Object.defineProperty(t.prototype,"initialStateValue",{get:function(){if(this.__cache.initialState)return this.__cache.initialState;var t="parallel"===this.type?O(this.states,function(t){return t.initialStateValue||y},function(t){return!t.history}):"string"==typeof this.resolvedStateValue?void 0:this.resolvedStateValue[this.key];return this.__cache.initialState=t,this.__cache.initialState},enumerable:!0,configurable:!0}),t.prototype.getState=function(t,e){var n=this;void 0===e&&(e=this.machine.context);var i={},o=[];this.getStateNodes(t).forEach(function(t){t.onEntry&&o.push.apply(o,t.onEntry),t.activities&&t.activities.forEach(function(t){i[S(t)]=!0,o.push(Q(t))})});var u=o.filter(function(t){return"object"==typeof t&&(t.type===r||t.type===a)}),c=o.filter(function(t){return"object"==typeof t&&t.type===s}),h=e?c.reduce(function(t,e){var n=e.assignment,r={};return"function"==typeof n?r=n(t,{type:"init"}):Object.keys(n).forEach(function(e){var i=n[e];r[e]="function"==typeof i?i(t,{type:"init"}):i}),Object.assign({},t,r)},e):e,f=new m(t,h,void 0,void 0,I(o,this.options.actions),i,void 0,[]);return u.reduce(function(t,e){var r,i=t.actions;return(r=(t=n.transition(t,e.type===a?l:e.event,t.context)).actions).unshift.apply(r,i),t},f)},Object.defineProperty(t.prototype,"initialState",{get:function(){var t=this.initialStateValue;if(!t)throw new Error("Cannot retrieve initial state from simple state '"+this.id+"'.");var e=this.getState(t);return this.resolveTransition({value:e.value,source:void 0,entryExitStates:{entry:new Set(this.getStateNodes(e.value)),exit:new Set},actions:[],paths:[]},e)},enumerable:!0,configurable:!0}),Object.defineProperty(t.prototype,"target",{get:function(){var t;if(this.history){var e=this.config;t=e.target&&"string"==typeof e.target&&d(e.target)?w(this.machine.getStateNodeById(e.target).path.slice(this.path.length-1)):e.target}return t},enumerable:!0,configurable:!0}),t.prototype.getStates=function(t){var e=this;if("string"==typeof t)return[this.states[t]];var n=[];return Object.keys(t).forEach(function(r){n.push.apply(n,e.states[r].getStates(t[r]))}),n},t.prototype.getRelativeStateNodes=function(t,e,n){if(void 0===n&&(n=!0),"string"==typeof t&&d(t)){var r=this.getStateNodeById(t);return n?r.history?r.resolveHistory(e):r.initialStateNodes:[r]}var i=x(t,this.delimiter),o=(this.parent||this).getFromRelativePath(i,e);return n?P(o.map(function(t){return t.initialStateNodes})):o},Object.defineProperty(t.prototype,"initialStateNodes",{get:function(){var t=this;if("atomic"===this.type||"final"===this.type)return[this];var e=this.initialStateValue;return P(k(e).map(function(e){return t.getFromRelativePath(e)}))},enumerable:!0,configurable:!0}),t.prototype.getFromRelativePath=function(t,e){if(!t.length)return[this];var n=t[0],r=t.slice(1);if(!this.states)throw new Error("Cannot retrieve subPath '"+n+"' from node with no states");var i=this.getStateNode(n);if(i.history)return i.resolveHistory(e);if(!this.states[n])throw new Error("Child state '"+n+"' does not exist on '"+this.id+"'");return this.states[n].getFromRelativePath(r,e)},t.updateHistoryValue=function(t,e){return{current:e,states:function t(e,n){return E(e.states,function(e,r){if(e){var i=("string"==typeof n?void 0:n[r])||(e?e.current:void 0);if(i)return{current:i,states:t(e,i)}}})}(t,e)}},t.prototype.historyValue=function(t){if(Object.keys(this.states).length)return{current:t||this.initialStateValue,states:O(this.states,function(e,n){if(!t)return e.historyValue();var r="string"==typeof t?void 0:t[n];return e.historyValue(r||e.initialStateValue)},function(t){return!t.history})}},t.prototype.resolveHistory=function(t){var e=this;if(!this.history)return[this];var n=this.parent;if(!t)return this.target?P(k(this.target).map(function(t){return n.getFromRelativePath(t)})):this.parent.initialStateNodes;var r=N(n.path,"states")(t).current;return"string"==typeof r?[n.getStateNode(r)]:P(k(r).map(function(t){return"deep"===e.history?n.getFromRelativePath(t):[n.states[t[0]]]}))},Object.defineProperty(t.prototype,"stateIds",{get:function(){var t=this,e=P(Object.keys(this.states).map(function(e){return t.states[e].stateIds}));return[this.id].concat(e)},enumerable:!0,configurable:!0}),Object.defineProperty(t.prototype,"events",{get:function(){if(this.__cache.events)return this.__cache.events;var t=this.states,e=new Set(Object.keys(this.on));return t&&Object.keys(t).forEach(function(n){var r=t[n];if(r.states)for(var i=0,o=r.events;i<o.length;i++){var a=o[i];e.add(""+a)}}),this.__cache.events=Array.from(e)},enumerable:!0,configurable:!0}),t.prototype.formatTransition=function(t,e,r){var i=this,o=!!e&&e.internal;if(void 0===t||""===t)return n({},e,{actions:e?V(e.actions):[],target:void 0,internal:!e||(void 0===e.internal||e.internal),event:r});var a=V(t).map(function(t){var e="string"==typeof t&&t[0]===i.delimiter;return o=o||e,e&&!i.parent?t.slice(1):e?i.key+t:t});return n({},e,{actions:e?V(e.actions):[],target:a,internal:o,event:r})},t.prototype.formatTransitions=function(){var t=this,e=this.config.on||y,n=this.after,r=E(e,function(e,n){return void 0===e?[{target:void 0,event:n,actions:[]}]:Array.isArray(e)?e.map(function(e){return t.formatTransition(e.target,e,n)}):"string"==typeof e?[t.formatTransition([e],void 0,n)]:[t.formatTransition(e.target,e,n)]});return n.forEach(function(t){r[t.event]=r[t.event]||[],r[t.event].push(t)}),r}}(),function(){function t(t,e,n,r,i,o,a,s){void 0===i&&(i=[]),void 0===o&&(o=h),void 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r=this,i=e.type,o=this.on[i],s=this.transient?[{type:a}]:[];if(!o||!o.length)return{value:void 0,source:t,entryExitStates:void 0,actions:s,paths:[]};for(var u,c=[],h=0,p=o;h<p.length;h++){var y=p[h],v=y,d=v.cond,g=v.in,m=n||l,S=!g||f(b(g,this.delimiter),j(this.path.slice(0,-2))(t.value));if((!d||this.evaluateCond(d,m,e,t.value))&&S){c=V(y.target),s.push.apply(s,V(y.actions)),u=y;break}}if(u&&0===c.length)return{value:t.value,source:t,entryExitStates:void 0,actions:s,paths:[]};if(!u&&0===c.length)return{value:void 0,source:t,entryExitStates:void 0,actions:s,paths:[]};var x=P(c.map(function(e){return r.getRelativeStateNodes(e,t.historyValue)})),w=x.map(function(t){return t.path}),E=x.reduce(function(t,e){var n=r.getEntryExitStates(e,!!u.internal),i=n.entry,o=n.exit;return{entry:new Set(Array.from(t.entry).concat(Array.from(i))),exit:new Set(Array.from(t.exit).concat(Array.from(o)))}},{entry:new Set,exit:new Set});return{value:this.machine.resolve(A(P(c.map(function(e){return 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t){if(!o||!o[t])throw new Error("Condition '"+t+"' is not implemented on machine '"+this.machine.id+"'.");i=o[t]}else i=t;return i(e,n,r)},Object.defineProperty(t.prototype,"delays",{get:function(){var t=this;return Array.from(new Set(this.after.map(function(t){return t.delay}))).map(function(e){return{id:t.id,delay:e}})},enumerable:!0,configurable:!0}),t.prototype.getActions=function(t){var n=this,r=new Set,o={entry:t.entryExitStates?P(Array.from(t.entryExitStates.entry).map(function(e){if("final"===e.type){var o=n.getStateNodeValueTree(t.value);r.add(H(e.id));var a=e.parent?e.parent.parent:void 0;if(a){var s=N(a.path,"value")(o);Object.keys(s.value).every(function(t){return Object.keys(s.value[t].value).every(function(e){return"final"===s.value[t].value[e].stateNode.type})})&&r.add(H(s.stateNode.id))}}return e.onEntry.concat(e.activities.map(function(t){return F(t)}),e.delays.map(function(t){var e,n,r=t.delay,o=t.id;return e=B(r,o),n={delay:r},{type:i,event:_(e),delay:n?n.delay:void 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Array.from(t.exit).forEach(function(t){t.activities&&t.activities.forEach(function(t){r[t.type]=!1})}),Array.from(t.entry).forEach(function(t){t.activities&&t.activities.forEach(function(t){r[t.type]=!0})}),r},t.prototype.transition=function(t,e,n){var r="string"==typeof t?this.resolve(w(this.getResolvedPath(t))):t instanceof m?t:this.resolve(t),i=n||(t instanceof m?t.context:void 0),o=_(e),a=o.type;if(this.strict&&-1===this.events.indexOf(a))throw new Error("Machine '"+this.id+"' does not accept event '"+a+"'");var s=m.from(r,i),u=this._transition(s.value,s,o,i);return this.resolveTransition(u,s,o)},t.prototype.resolveTransition=function(n,i,o){var u,c=i.historyValue?i.historyValue:n.source?this.machine.historyValue(i.value):void 0,h=this.getActions(n),f=this.getActivities(n.entryExitStates,i.activities),p=h.filter(function(t){return"object"==typeof t&&(t.type===r||t.type===a)}),l=h.filter(function(t){return"object"!=typeof t||t.type!==r&&t.type!==a&&t.type!==s}),v=h.filter(function(t){return"object"==typeof t&&t.type===s}),d=i.context?v.reduce(function(t,n){var r=n.assignment,i={};return"function"==typeof r?i=r(t,o||{type:e.Init}):Object.keys(r).forEach(function(e){var n=r[e];i[e]="function"==typeof n?n(t,o):n}),Object.assign({},t,i)},i.context):i.context,g=n.value?this.getStateNodes(n.value):[];g.some(function(t){return t.transient})&&p.push({type:a});var S=[this].concat(g).reduce(function(t,e){return void 0!==e.data&&(t[e.id]=e.data),t},{}),x=n.value?new m(n.value,d,c?t.updateHistoryValue(c,n.value):void 0,n.source?i:void 0,R(l,this.options.actions),f,S,p):void 0;if(!x)return m.inert(i,d);i.history&&delete i.history.history;for(var b=x;p.length;){var w=b.actions,E=p.shift();(u=(b=this.transition(b,E.type===a?y:E.event,b.context)).actions).unshift.apply(u,w)}return b},t.prototype.ensureValidPaths=function(t){var e=this,n=new Map;t:for(var r=0,i=P(t.map(function(t){return e.getRelativeStateNodes(t)}));r<i.length;r++)for(var o=i[r],a=o;a.parent;){if(n.has(a.parent)){if("parallel"===a.parent.type)continue t;throw new Error("State node '"+o.id+"' shares parent '"+a.parent.id+"' with state node '"+n.get(a.parent).map(function(t){return t.id})+"'")}n.get(a.parent)?n.get(a.parent).push(o):n.set(a.parent,[o]),a=a.parent}},t.prototype.getStateNode=function(t){if(d(t))return this.machine.getStateNodeById(t);if(!this.states)throw new Error("Unable to retrieve child state '"+t+"' from '"+this.id+"'; no child states exist.");var e=this.states[t];if(!e)throw new Error("Child state '"+t+"' does not exist on '"+this.id+"'");return e},t.prototype.getStateNodeById=function(t){var e=d(t)?t.slice("#".length):t;if(e===this.id)return this;var n=this.machine.idMap[e];if(!n)throw new Error("Substate '#"+e+"' does not exist on '"+this.id+"'");return n},t.prototype.getStateNodeByPath=function(t){for(var e=x(t,this.delimiter),n=this;e.length;){var r=e.shift();n=n.getStateNode(r)}return n},t.prototype.resolve=function(t){var e,n=this;if("string"==typeof t){var r=this.getStateNode(t);return r.initial?((e={})[t]=r.initialStateValue,e):t}return"parallel"===this.type?E(this.initialStateValue,function(e,r){return e?n.getStateNode(r).resolve(t[r]||e):l}):E(t,function(t,e){return t?n.getStateNode(e).resolve(t):l})},Object.defineProperty(t.prototype,"resolvedStateValue",{get:function(){var t,e,n=this.key;return"parallel"===this.type?((t={})[n]=O(this.states,function(t){return t.resolvedStateValue[t.key]},function(t){return!t.history}),t):this.initial?((e={})[n]=this.states[this.initial].resolvedStateValue,e):n},enumerable:!0,configurable:!0}),t.prototype.getResolvedPath=function(t){if(d(t)){var e=this.machine.idMap[t.slice("#".length)];if(!e)throw new Error("Unable to find state node '"+t+"'");return e.path}return x(t,this.delimiter)},Object.defineProperty(t.prototype,"initialStateValue",{get:function(){if(this.__cache.initialState)return this.__cache.initialState;var t="parallel"===this.type?O(this.states,function(t){return t.initialStateValue||l},function(t){return!t.history}):"string"==typeof this.resolvedStateValue?void 0:this.resolvedStateValue[this.key];return this.__cache.initialState=t,this.__cache.initialState},enumerable:!0,configurable:!0}),t.prototype.getState=function(t,e){var n=this;void 0===e&&(e=this.machine.context);var i={},o=[];this.getStateNodes(t).forEach(function(t){t.onEntry&&o.push.apply(o,t.onEntry),t.activities&&t.activities.forEach(function(t){i[S(t)]=!0,o.push(F(t))})});var u=o.filter(function(t){return"object"==typeof t&&(t.type===r||t.type===a)}),c=o.filter(function(t){return"object"==typeof t&&t.type===s}),h=e?c.reduce(function(t,e){var n=e.assignment,r={};return"function"==typeof n?r=n(t,{type:"init"}):Object.keys(n).forEach(function(e){var i=n[e];r[e]="function"==typeof i?i(t,{type:"init"}):i}),Object.assign({},t,r)},e):e,f=new m(t,h,void 0,void 0,R(o,this.options.actions),i,void 0,[]);return u.reduce(function(t,e){var r,i=t.actions;return(r=(t=n.transition(t,e.type===a?y:e.event,t.context)).actions).unshift.apply(r,i),t},f)},Object.defineProperty(t.prototype,"initialState",{get:function(){var t=this.initialStateValue;if(!t)throw new Error("Cannot retrieve initial state from simple state '"+this.id+"'.");var e=this.getState(t);return this.resolveTransition({value:e.value,source:void 0,entryExitStates:{entry:new Set(this.getStateNodes(e.value)),exit:new Set},actions:[],paths:[]},e)},enumerable:!0,configurable:!0}),Object.defineProperty(t.prototype,"target",{get:function(){var t;if(this.history){var e=this.config;t=e.target&&"string"==typeof e.target&&d(e.target)?w(this.machine.getStateNodeById(e.target).path.slice(this.path.length-1)):e.target}return t},enumerable:!0,configurable:!0}),t.prototype.getStates=function(t){var e=this;if("string"==typeof t)return[this.states[t]];var n=[];return Object.keys(t).forEach(function(r){n.push.apply(n,e.states[r].getStates(t[r]))}),n},t.prototype.getRelativeStateNodes=function(t,e,n){if(void 0===n&&(n=!0),"string"==typeof t&&d(t)){var r=this.getStateNodeById(t);return n?r.history?r.resolveHistory(e):r.initialStateNodes:[r]}var i=x(t,this.delimiter),o=(this.parent||this).getFromRelativePath(i,e);return n?P(o.map(function(t){return t.initialStateNodes})):o},Object.defineProperty(t.prototype,"initialStateNodes",{get:function(){var t=this;if("atomic"===this.type||"final"===this.type)return[this];var e=this.initialStateValue;return P(k(e).map(function(e){return t.getFromRelativePath(e)}))},enumerable:!0,configurable:!0}),t.prototype.getFromRelativePath=function(t,e){if(!t.length)return[this];var n=t[0],r=t.slice(1);if(!this.states)throw new Error("Cannot retrieve subPath '"+n+"' from node with no states");var i=this.getStateNode(n);if(i.history)return i.resolveHistory(e);if(!this.states[n])throw new Error("Child state '"+n+"' does not exist on '"+this.id+"'");return this.states[n].getFromRelativePath(r,e)},t.updateHistoryValue=function(t,e){return{current:e,states:function t(e,n){return E(e.states,function(e,r){if(e){var i=("string"==typeof n?void 0:n[r])||(e?e.current:void 0);if(i)return{current:i,states:t(e,i)}}})}(t,e)}},t.prototype.historyValue=function(t){if(Object.keys(this.states).length)return{current:t||this.initialStateValue,states:O(this.states,function(e,n){if(!t)return e.historyValue();var r="string"==typeof t?void 0:t[n];return e.historyValue(r||e.initialStateValue)},function(t){return!t.history})}},t.prototype.resolveHistory=function(t){var e=this;if(!this.history)return[this];var n=this.parent;if(!t)return this.target?P(k(this.target).map(function(t){return n.getFromRelativePath(t)})):this.parent.initialStateNodes;var r=N(n.path,"states")(t).current;return"string"==typeof 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o=o||e,e&&!i.parent?t.slice(1):e?i.key+t:t});return n({},e,{actions:e?V(e.actions):[],target:a,internal:o,event:r})},t.prototype.formatTransitions=function(){var t=this,e=this.config.on||l,n=this.after,r=E(e,function(e,n){return void 0===e?[{target:void 0,event:n,actions:[]}]:Array.isArray(e)?e.map(function(e){return t.formatTransition(e.target,e,n)}):"string"==typeof e?[t.formatTransition([e],void 0,n)]:[t.formatTransition(e.target,e,n)]});return n.forEach(function(t){r[t.event]=r[t.event]||[],r[t.event].push(t)}),r}}(),function(){function t(t,e,n,r,i,o,a,s){void 0===i&&(i=[]),void 0===o&&(o=h),void 0===a&&(a={}),void 0===s&&(s=[]),this.value=t,this.context=e,this.historyValue=n,this.history=r,this.actions=i,this.activities=o,this.data=a,this.events=s}return t.from=function(e,n){return e instanceof t?e.context!==n?new t(e.value,n,e.historyValue,e.history,[],e.activities,{},[]):e:new t(e,n,void 0,void 0,[],void 0,void 0,[])},t.inert=function(e,n){return e instanceof t?e.actions.length?new t(e.value,n,e.historyValue,e.history,[],e.activities,void 0,[]):e:t.from(e,n)},t.prototype.toStrings=function(t){var e=this;if(void 0===t&&(t=this.value),"string"==typeof t)return[t];var n=Object.keys(t);return n.concat.apply(n,n.map(function(n){return e.toStrings(t[n]).map(function(t){return n+"."+t})}))},t.prototype.matches=function(t){return f(t,this.value)},Object.defineProperty(t.prototype,"changed",{get:function(){if(this.history)return!!this.actions.length||typeof this.history.value!=typeof this.value||("string"==typeof this.value?this.value!==this.history.value:function t(e,n){if(e===n)return!0;var r=Object.keys(e);var i=Object.keys(n);return r.length===i.length&&r.every(function(r){return t(e[r],n[r])})}(this.value,this.history.value))},enumerable:!0,configurable:!0}),t}());function S(t){try{return"string"==typeof t||"number"==typeof t?""+t:t.type}catch(t){throw new Error("Events must be strings or objects with a string event.type property.")}}function x(t,e){try{return Array.isArray(t)?t:t.toString().split(e)}catch(e){throw new Error("'"+t+"' is not a valid state path.")}}function b(t,e){return t instanceof m?t.value:"object"!=typeof t||t instanceof m?w(x(t,e)):t}function w(t){if(1===t.length)return t[0];for(var e={},n=e,r=0;r<t.length-1;r++)r===t.length-2?n[t[r]]=t[r+1]:(n[t[r]]={},n=n[t[r]]);return e}function E(t,e){var n={};return Object.keys(t).forEach(function(r,i){n[r]=e(t[r],r,t,i)}),n}function O(t,e,n){var r={};return Object.keys(t).forEach(function(i){var o=t[i];n(o)&&(r[i]=e(o,i,t))}),r}var j=function(t){return function(e){for(var n=e,r=0,i=t;r<i.length;r++){n=n[i[r]]}return n}};function N(t,e){return function(n){for(var r=n,i=0,o=t;i<o.length;i++){var a=o[i];r=r[e][a]}return r}}var k=function(t){return"string"==typeof t?[[t]]:P(Object.keys(t).map(function(e){return k(t[e]).map(function(t){return[e].concat(t)})}))},A=function(t){var e={};if(t&&1===t.length&&1===t[0].length)return t[0][0];for(var 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n=M(t);return{type:e.Start,activity:n,exec:n.start?n.start.exec:void 0}}function B(t,n){var r=n?"#"+n:"";return e.After+"("+t+")"+r}function H(t){return e.DoneState+"."+t}var Q=function(){function t(){this.timeouts=new Map,this._now=0,this._id=0}return t.prototype.now=function(){return this._now},t.prototype.getId=function(){return this._id++},t.prototype.setTimeout=function(t,e){var n=this.getId();return this.timeouts.set(n,{start:this.now(),timeout:e,fn:t}),n},t.prototype.clearTimeout=function(t){this.timeouts.delete(t)},t.prototype.set=function(t){if(this._now>t)throw new Error("Unable to travel back in time");this._now=t,this.flushTimeouts()},t.prototype.flushTimeouts=function(){var t=this;this.timeouts.forEach(function(e,n){t.now()-e.start>=e.timeout&&(e.fn.call(null),t.timeouts.delete(n))})},t.prototype.increment=function(t){this._now+=t,this.flushTimeouts()},t}(),z=function(){function t(e,r,i){void 0===i&&(i=t.defaultOptions);var o=this;this.machine=e,this.eventQueue=[],this.delayedEventsMap={},this.listeners=new Set,this.stopListeners=new Set,this.initialized=!1,this.init=this.start,this.send=function(t){var e=_(t);if(!o.initialized)throw new Error('Unable to send event "'+e.type+'" to an uninitialized interpreter.');var n=o.machine.transition(o.state,e,o.extState);return o.update(n,t),o.flushEventQueue(),n},r&&this.onTransition(r);var a=n({},t.defaultOptions,i);this.clock=a.clock,this.logger=a.logger}return t.prototype.update=function(t,e){var n=this;this.state=t;var r=this.state.context;this.state.actions.forEach(function(t){n.exec(t,r,e?_(e):void 0)},r),this.listeners.forEach(function(e){return e(t)})},t.prototype.onTransition=function(t){return this.listeners.add(t),this},t.prototype.onStop=function(t){return this.stopListeners.add(t),this},t.prototype.off=function(t){return this.listeners.delete(t),this},t.prototype.start=function(t){return void 0===t&&(t=this.machine.initialState),this.update(t),this.initialized=!0,this},t.prototype.stop=function(){var t=this;return this.listeners.forEach(function(e){return t.off(e)}),this.stopListeners.forEach(function(e){e(),t.stopListeners.delete(e)}),this},t.prototype.defer=function(t){var e=this;return this.clock.setTimeout(function(){return e.send(t.event)},t.delay||0)},t.prototype.cancel=function(t){this.clock.clearTimeout(this.delayedEventsMap[t]),delete this.delayedEventsMap[t]},t.prototype.exec=function(t,e,n){if(t.exec)return t.exec(e,n);switch(t.type){case i:var r=t;r.delay?this.delayedEventsMap[r.id]=this.defer(r):this.eventQueue.push(r.event);break;case o:this.cancel(t.sendId);break;case u:var a=t.expr?t.expr(e,n):void 0;t.label?this.logger(t.label,a):this.logger(a);break;default:console.warn("No implementation found for action type '"+t.type+"'")}},t.prototype.flushEventQueue=function(){var 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dist/xstate.js

@@ -1,1 +0,1 @@
-!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?e(exports):"function"==typeof define&&define.amd?define(["exports"],e):e(t.xstate={})}(this,function(t){"use strict";var e=".",n={},r=function(){function t(t,e,r,i,a,o,s,u){void 0===a&&(a=[]),void 0===o&&(o=n),void 0===s&&(s={}),void 0===u&&(u=[]),this.value=t,this.context=e,this.historyValue=r,this.history=i,this.actions=a,this.activities=o,this.data=s,this.events=u}return t.from=function(e,n){return e instanceof t?e.context!==n?new t(e.value,n,e.historyValue,e.history,[],e.activities,{},[]):e:new t(e,n,void 0,void 0,[],void 0,void 0,[])},t.inert=function(e,n){return e instanceof t?e.actions.length?new t(e.value,n,e.historyValue,e.history,[],e.activities,void 0,[]):e:t.from(e,n)},t.prototype.toStrings=function(t){var e=this;if(void 0===t&&(t=this.value),"string"==typeof t)return[t];var n=Object.keys(t);return n.concat.apply(n,n.map(function(n){return e.toStrings(t[n]).map(function(t){return n+"."+t})}))},t.prototype.matches=function(t){return d(t,this.value)},Object.defineProperty(t.prototype,"changed",{get:function(){return!!this.history&&(!!this.actions.length||typeof this.history.value!==this.value||("string"==typeof this.value?this.value!==this.history.value:function t(e,n){if(e===n)return!0;var r=Object.keys(e);var i=Object.keys(n);return r.length===i.length&&r.every(function(r){return t(e[r],n[r])})}(this.value,this.history.value)))},enumerable:!0,configurable:!0}),t}();function i(t){try{return"string"==typeof t||"number"==typeof t?""+t:t.type}catch(t){throw new Error("Events must be strings or objects with a string event.type property.")}}function a(t,e){try{return Array.isArray(t)?t:t.toString().split(e)}catch(e){throw new Error("'"+t+"' is not a valid state path.")}}function o(t,e){return t instanceof r?t.value:"object"!=typeof t||t instanceof r?s(a(t,e)):t}function s(t){if(1===t.length)return t[0];for(var 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i=o(t,r),a=o(n,r);return"string"==typeof a?"string"==typeof i&&a===i:"string"==typeof i?i in a:Object.keys(i).every(function(t){return t in a&&d(i[t],a[t])})}var g,m=function(){return(m=Object.assign||function(t){for(var e,n=1,r=arguments.length;n<r;n++)for(var i in e=arguments[n])Object.prototype.hasOwnProperty.call(e,i)&&(t[i]=e[i]);return t}).apply(this,arguments)};(g=t.ActionTypes||(t.ActionTypes={})).Start="xstate.start",g.Stop="xstate.stop",g.Raise="xstate.raise",g.Send="xstate.send",g.Cancel="xstate.cancel",g.Null="xstate.null",g.Assign="xstate.assign",g.After="xstate.after",g.DoneState="done.state",g.Log="xstate.log";var S=t.ActionTypes.Start,b=t.ActionTypes.Stop,x=t.ActionTypes.Raise,j=t.ActionTypes.Send,E=t.ActionTypes.Cancel,w=t.ActionTypes.Null,O=t.ActionTypes.Assign,A=t.ActionTypes.After,N=t.ActionTypes.DoneState,k=t.ActionTypes.Log,P=Object.freeze({start:S,stop:b,raise:x,send:j,cancel:E,_null:w,null:w,assign:O,after:A,doneState:N,log:k}),V=function(t,e){if("string"==typeof t||"number"==typeof t){var n={type:t};return void 0!==e&&(n.id=e),n}return t};function T(t,e){if(e){var n=e[t];if(n)return"function"==typeof n?n:n.exec}}var _=function(t,e){var n;if("string"==typeof t||"number"==typeof t)n={type:t,exec:T(t,e)};else{if("function"!=typeof t){var r=T(t.type,e);return r?m({},t,{exec:r}):t}n={type:t.name,exec:t}}return Object.defineProperty(n,"toString",{value:function(){return n.type},enumerable:!1}),n};function R(t){var e=_(t);return m({},e,{type:e.type,start:e.start?_(e.start):e.exec?_(e.exec):void 0,stop:e.stop?_(e.stop):void 0})}var M=function(t,e){return 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a?this.getStateNodes(((e={})[i]=a,e)):[this.states[i]]}var s=Object.keys(i);return s.map(function(t){return n.getStateNode(t)}).concat(s.reduce(function(t,e){var r=n.getStateNode(e).getStateNodes(i[e]);return t.concat(r)},[]))},t.prototype.handles=function(t){var e=i(t);return-1!==this.events.indexOf(e)},t.prototype.transitionLeafNode=function(t,e,n,r){var i=this.getStateNode(t),a=i.next(e,n,r);if(!a.value){var o=this.next(e,n,r),s=o.value,u=o.entryExitStates,c=o.actions,f=o.paths;return{value:s,source:e,entryExitStates:{entry:u?u.entry:new Set,exit:new Set([i].concat(u?Array.from(u.exit):[]))},actions:c,paths:f}}return a},t.prototype.transitionNestedNode=function(t,e,n,r){var i=Object.keys(t),a=this.getStateNode(i[0]),o=a._transition(t[i[0]],e,n,r);if(!o.value){var s=this.next(e,n,r),u=s.value,c=s.entryExitStates,f=s.actions,h=s.paths;return{value:u,source:e,entryExitStates:{entry:c?c.entry:new Set,exit:new Set((o.entryExitStates?Array.from(o.entryExitStates.exit):[]).concat([a],c?Array.from(c.exit):[]))},actions:f,paths:h}}return o},t.prototype.transitionParallelNode=function(t,e,n,r){var i=this,a={};if(Object.keys(t).forEach(function(o){var s=t[o];if(s){var u=i.getStateNode(o)._transition(s,e,n,r);u.value,a[o]=u}}),!Object.keys(a).some(function(t){return void 0!==a[t].value})){var o=this.next(e,n,r),u=o.value,c=o.entryExitStates,h=o.actions,l=o.paths;return{value:u,source:e,entryExitStates:{entry:c?c.entry:new Set,exit:new Set(Object.keys(this.states).map(function(t){return i.states[t]}).concat(c?Array.from(c.exit):[]))},actions:h,paths:l}}var g=v(Object.keys(a).map(function(t){return a[t].paths}));if(1===g.length&&!d(s(this.path),s(g[0])))return{value:this.machine.resolve(y(g)),source:e,entryExitStates:Object.keys(a).map(function(t){return a[t].entryExitStates}).reduce(function(t,e){var n=e,r=n.entry,i=n.exit;return{entry:new Set(Array.from(t.entry).concat(Array.from(r))),exit:new 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r=this,i=e.type,a=this.on[i],s=this.transient?[{type:w}]:[];if(!a||!a.length)return{value:void 0,source:t,entryExitStates:void 0,actions:s,paths:[]};for(var u,c=[],h=0,p=a;h<p.length;h++){var g=p[h],m=g,S=m.cond,b=m.in,x=n||G,j=!b||d(o(b,this.delimiter),f(this.path.slice(0,-2))(t.value));if((!S||this.evaluateCond(S,x,e,t.value))&&j){c=l(g.target),s.push.apply(s,l(g.actions)),u=g;break}}if(u&&0===c.length)return{value:t.value,source:t,entryExitStates:void 0,actions:s,paths:[]};if(!u&&0===c.length)return{value:void 0,source:t,entryExitStates:void 0,actions:s,paths:[]};var E=v(c.map(function(e){return r.getRelativeStateNodes(e,t.historyValue)})),O=E.map(function(t){return t.path}),A=E.reduce(function(t,e){var n=r.getEntryExitStates(e,!!u.internal),i=n.entry,a=n.exit;return{entry:new Set(Array.from(t.entry).concat(Array.from(i))),exit:new Set(Array.from(t.exit).concat(Array.from(a)))}},{entry:new Set,exit:new Set});return{value:this.machine.resolve(y(v(c.map(function(e){return r.getRelativeStateNodes(e,t.historyValue).map(function(t){return t.path})})))),source:t,entryExitStates:A,actions:s,paths:O}},t.prototype.getStateNodeValueTree=function(t){var e,n=this;return"string"==typeof t?{stateNode:this,value:(e={},e[t]={stateNode:this.getStateNode(t),value:void 0},e)}:{stateNode:this,value:u(t,function(t,e){return n.getStateNode(e).getStateNodeValueTree(t)})}},t.prototype.getEntryExitStates=function(t,e){for(var n={entry:[],exit:[]},r=this.path,i=t.path,a=this.machine,o=0;o<Math.min(r.length,i.length);o++){var s=r[o];if(s!==i[o])break;a=a.getStateNode(s)}for(var u=a.path,c=a,f=0,h=r.slice(u.length);f<h.length;f++){var p=h[f];c=c.getStateNode(p),n.exit.unshift(c)}a===this&&(e||(n.exit.push(this),n.entry.push(this))),c=a;for(var y=0,v=i.slice(u.length);y<v.length;y++){p=v[y];c=c.getStateNode(p),n.entry.push(c)}return{entry:new Set(n.entry),exit:new Set(n.exit)}},t.prototype.evaluateCond=function(t,e,n,r){var i,a=this.machine.options.guards;if("string"==typeof t){if(!a||!a[t])throw new Error("Condition '"+t+"' is not implemented on machine '"+this.machine.id+"'.");i=a[t]}else i=t;return i(e,n,r)},Object.defineProperty(t.prototype,"delays",{get:function(){var t=this;return Array.from(new Set(this.after.map(function(t){return t.delay}))).map(function(e){return{id:t.id,delay:e}})},enumerable:!0,configurable:!0}),t.prototype.getActions=function(t){var e=this,n=new Set,r={entry:t.entryExitStates?v(Array.from(t.entryExitStates.entry).map(function(r){if("final"===r.type){var i=e.getStateNodeValueTree(t.value);n.add(L(r.id));var a=r.parent?r.parent.parent:void 0;if(a){var o=h(a.path,"value")(i);Object.keys(o.value).every(function(t){return Object.keys(o.value[t].value).every(function(e){return"final"===o.value[t].value[e].stateNode.type})})&&n.add(L(o.stateNode.id))}}return r.onEntry.concat(r.activities.map(function(t){return B(t)}),r.delays.map(function(t){var e=t.delay,n=t.id;return I(D(e,n),{delay:e})}))})).concat(Array.from(n).map(C)):[],exit:t.entryExitStates?v(Array.from(t.entryExitStates.exit).map(function(t){return t.onExit.concat(t.activities.map(function(t){return H(t)}),t.delays.map(function(t){var e=t.delay,n=t.id;return F(D(e,n))}))})):[]};return r.exit.concat(t.actions).concat(r.entry).map(function(t){return"string"==typeof t?e.resolveAction(t):t})},t.prototype.resolveAction=function(t){var e=this.machine.options.actions;return(e?e[t]:t)||t},t.prototype.resolveActivity=function(t){var e=this.machine.options.activities;return"string"==typeof t?R(e?m({type:t},e[t]):t):t},t.prototype.getActivities=function(t,e){if(!t)return G;var n=m({},e);return Array.from(t.exit).forEach(function(t){t.activities&&t.activities.forEach(function(t){n[t.type]=!1})}),Array.from(t.entry).forEach(function(t){t.activities&&t.activities.forEach(function(t){n[t.type]=!0})}),n},t.prototype.transition=function(t,e,n){var i="string"==typeof t?this.resolve(s(this.getResolvedPath(t))):t instanceof r?t:this.resolve(t),a=n||(t instanceof r?t.context:void 0),o=V(e),u=o.type;if(this.strict&&-1===this.events.indexOf(u))throw new Error("Machine '"+this.id+"' does not accept event '"+u+"'");var c=r.from(i,a),f=this._transition(c.value,c,o,a);return this.resolveTransition(f,c,o)},t.prototype.resolveTransition=function(e,n,i){var a,o=n.historyValue?n.historyValue:e.source?this.machine.historyValue(n.value):void 0;try{this.ensureValidPaths(e.paths)}catch(t){throw new Error("Event '"+(i?i.type:"none")+"' leads to an invalid configuration: "+t.message)}var s=this.getActions(e),u=this.getActivities(e.entryExitStates,n.activities),c=s.filter(function(t){return"object"==typeof t&&(t.type===x||t.type===w)}),f=s.filter(function(t){return"object"!=typeof t||t.type!==x&&t.type!==w&&t.type!==O}),h=s.filter(function(t){return"object"==typeof t&&t.type===O}),p=n.context?h.reduce(function(t,e){var n=e.assignment,r={};return"function"==typeof n?r=n(t,i||{type:"xstate.init"}):Object.keys(n).forEach(function(e){var a=n[e];r[e]="function"==typeof a?a(t,i):a}),Object.assign({},t,r)},n.context):n.context,y=e.value?this.getStateNodes(e.value):[];y.some(function(t){return t.transient})&&c.push({type:w});var v=[this].concat(y).reduce(function(t,e){return void 0!==e.data&&(t[e.id]=e.data),t},{}),l=e.value?new r(e.value,p,o?t.updateHistoryValue(o,e.value):void 0,e.source?n:void 0,M(f,this.options.actions),u,v,c):void 0;if(!l)return r.inert(n,p);delete n.history;for(var d=l;c.length;){var g=d.actions,m=c.shift();(a=(d=this.transition(d,m.type===w?q:m.event,d.context)).actions).unshift.apply(a,g)}return d},t.prototype.ensureValidPaths=function(t){var e=this,n=new Map;t:for(var r=0,i=v(t.map(function(t){return e.getRelativeStateNodes(t)}));r<i.length;r++)for(var a=i[r],o=a;o.parent;){if(n.has(o.parent)){if("parallel"===o.parent.type)continue t;throw new Error("State node '"+a.id+"' shares parent '"+o.parent.id+"' with state node 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r.initial?((e={})[t]=r.initialStateValue,e):t}return"parallel"===this.type?u(this.initialStateValue,function(e,r){return e?n.getStateNode(r).resolve(t[r]||e):G}):u(t,function(t,e){return t?n.getStateNode(e).resolve(t):G})},Object.defineProperty(t.prototype,"resolvedStateValue",{get:function(){var t,e,n=this.key;return"parallel"===this.type?((t={})[n]=c(this.states,function(t){return t.resolvedStateValue[t.key]},function(t){return!t.history}),t):this.initial?((e={})[n]=this.states[this.initial].resolvedStateValue,e):n},enumerable:!0,configurable:!0}),t.prototype.getResolvedPath=function(t){if(K(t)){var e=this.machine.idMap[t.slice("#".length)];if(!e)throw new Error("Unable to find state node '"+t+"'");return e.path}return a(t,this.delimiter)},Object.defineProperty(t.prototype,"initialStateValue",{get:function(){if(this.__cache.initialState)return this.__cache.initialState;var t="parallel"===this.type?c(this.states,function(t){return t.initialStateValue||G},function(t){return!t.history}):"string"==typeof this.resolvedStateValue?void 0:this.resolvedStateValue[this.key];return this.__cache.initialState=t,this.__cache.initialState},enumerable:!0,configurable:!0}),t.prototype.getState=function(t,e){var n=this;void 0===e&&(e=this.machine.context);var a={},o=[];this.getStateNodes(t).forEach(function(t){t.onEntry&&o.push.apply(o,t.onEntry),t.activities&&t.activities.forEach(function(t){a[i(t)]=!0,o.push(B(t))})});var s=o.filter(function(t){return"object"==typeof t&&(t.type===x||t.type===w)}),u=o.filter(function(t){return"object"==typeof t&&t.type===O}),c=e?u.reduce(function(t,e){var n=e.assignment,r={};return"function"==typeof n?r=n(t,{type:"init"}):Object.keys(n).forEach(function(e){var i=n[e];r[e]="function"==typeof i?i(t,{type:"init"}):i}),Object.assign({},t,r)},e):e,f=new r(t,c,void 0,void 0,M(o,this.options.actions),a,void 0,[]);return s.reduce(function(t,e){var r,i=t.actions;return(r=(t=n.transition(t,e.type===w?q:e.event,t.context)).actions).unshift.apply(r,i),t},f)},Object.defineProperty(t.prototype,"initialState",{get:function(){var t=this.initialStateValue;if(!t)throw new Error("Cannot retrieve initial state from simple state '"+this.id+"'.");var e=this.getState(t);return this.resolveTransition({value:e.value,source:void 0,entryExitStates:{entry:new Set(this.getStateNodes(e.value)),exit:new Set},actions:[],paths:[]},e)},enumerable:!0,configurable:!0}),Object.defineProperty(t.prototype,"target",{get:function(){var t;if(this.history){var e=this.config;t=e.target&&"string"==typeof e.target&&K(e.target)?s(this.machine.getStateNodeById(e.target).path.slice(this.path.length-1)):e.target}return t},enumerable:!0,configurable:!0}),t.prototype.getStates=function(t){var e=this;if("string"==typeof t)return[this.states[t]];var n=[];return Object.keys(t).forEach(function(r){n.push.apply(n,e.states[r].getStates(t[r]))}),n},t.prototype.getRelativeStateNodes=function(t,e,n){if(void 0===n&&(n=!0),"string"==typeof t&&K(t)){var r=this.getStateNodeById(t);return n?r.history?r.resolveHistory(e):r.initialStateNodes:[r]}var i=a(t,this.delimiter),o=(this.parent||this).getFromRelativePath(i,e);return n?v(o.map(function(t){return t.initialStateNodes})):o},Object.defineProperty(t.prototype,"initialStateNodes",{get:function(){var t=this;if("atomic"===this.type||"final"===this.type)return[this];var e=this.initialStateValue;return v(p(e).map(function(e){return t.getFromRelativePath(e)}))},enumerable:!0,configurable:!0}),t.prototype.getFromRelativePath=function(t,e){if(!t.length)return[this];var n=t[0],r=t.slice(1);if(!this.states)throw new Error("Cannot retrieve subPath '"+n+"' from node with no states");var i=this.getStateNode(n);if(i.history)return i.resolveHistory(e);if(!this.states[n])throw new Error("Child state '"+n+"' does not 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r=this,i=e.type,a=this.on[i],s=this.transient?[{type:O}]:[];if(!a||!a.length)return{value:void 0,source:t,entryExitStates:void 0,actions:s,paths:[]};for(var u,c=[],h=0,p=a;h<p.length;h++){var g=p[h],m=g,S=m.cond,b=m.in,x=n||J,j=!b||d(o(b,this.delimiter),f(this.path.slice(0,-2))(t.value));if((!S||this.evaluateCond(S,x,e,t.value))&&j){c=l(g.target),s.push.apply(s,l(g.actions)),u=g;break}}if(u&&0===c.length)return{value:t.value,source:t,entryExitStates:void 0,actions:s,paths:[]};if(!u&&0===c.length)return{value:void 0,source:t,entryExitStates:void 0,actions:s,paths:[]};var A=v(c.map(function(e){return r.getRelativeStateNodes(e,t.historyValue)})),E=A.map(function(t){return t.path}),w=A.reduce(function(t,e){var n=r.getEntryExitStates(e,!!u.internal),i=n.entry,a=n.exit;return{entry:new Set(Array.from(t.entry).concat(Array.from(i))),exit:new Set(Array.from(t.exit).concat(Array.from(a)))}},{entry:new Set,exit:new Set});return{value:this.machine.resolve(y(v(c.map(function(e){return 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t){if(!a||!a[t])throw new Error("Condition '"+t+"' is not implemented on machine '"+this.machine.id+"'.");i=a[t]}else i=t;return i(e,n,r)},Object.defineProperty(e.prototype,"delays",{get:function(){var t=this;return Array.from(new Set(this.after.map(function(t){return t.delay}))).map(function(e){return{id:t.id,delay:e}})},enumerable:!0,configurable:!0}),e.prototype.getActions=function(t){var e=this,n=new Set,r={entry:t.entryExitStates?v(Array.from(t.entryExitStates.entry).map(function(r){if("final"===r.type){var i=e.getStateNodeValueTree(t.value);n.add(z(r.id));var a=r.parent?r.parent.parent:void 0;if(a){var o=h(a.path,"value")(i);Object.keys(o.value).every(function(t){return Object.keys(o.value[t].value).every(function(e){return"final"===o.value[t].value[e].stateNode.type})})&&n.add(z(o.stateNode.id))}}return r.onEntry.concat(r.activities.map(function(t){return H(t)}),r.delays.map(function(t){var e=t.delay;return F(L(e,t.id),{delay:e})}))})).concat(Array.from(n).map(C)):[],exit:t.entryExitStates?v(Array.from(t.entryExitStates.exit).map(function(t){return t.onExit.concat(t.activities.map(function(t){return D(t)}),t.delays.map(function(t){var e=t.delay,n=t.id;return B(L(e,n))}))})):[]};return r.exit.concat(t.actions).concat(r.entry).map(function(t){return"string"==typeof t?e.resolveAction(t):t})},e.prototype.resolveAction=function(t){var e=this.machine.options.actions;return(e?e[t]:t)||t},e.prototype.resolveActivity=function(t){var e=this.machine.options.activities;return"string"==typeof t?M(e?m({type:t},e[t]):t):t},e.prototype.getActivities=function(t,e){if(!t)return J;var n=m({},e);return Array.from(t.exit).forEach(function(t){t.activities&&t.activities.forEach(function(t){n[t.type]=!1})}),Array.from(t.entry).forEach(function(t){t.activities&&t.activities.forEach(function(t){n[t.type]=!0})}),n},e.prototype.transition=function(t,e,n){var i="string"==typeof t?this.resolve(s(this.getResolvedPath(t))):t instanceof r?t:this.resolve(t),a=n||(t instanceof r?t.context:void 0),o=V(e),u=o.type;if(this.strict&&-1===this.events.indexOf(u))throw new Error("Machine '"+this.id+"' does not accept event '"+u+"'");var c=r.from(i,a),f=this._transition(c.value,c,o,a);return this.resolveTransition(f,c,o)},e.prototype.resolveTransition=function(n,i,a){var o,s=i.historyValue?i.historyValue:n.source?this.machine.historyValue(i.value):void 0,u=this.getActions(n),c=this.getActivities(n.entryExitStates,i.activities),f=u.filter(function(t){return"object"==typeof t&&(t.type===x||t.type===O)}),h=u.filter(function(t){return"object"!=typeof t||t.type!==x&&t.type!==O&&t.type!==E}),p=u.filter(function(t){return"object"==typeof t&&t.type===E}),y=i.context?p.reduce(function(e,n){var r=n.assignment,i={};return"function"==typeof r?i=r(e,a||{type:t.ActionTypes.Init}):Object.keys(r).forEach(function(t){var n=r[t];i[t]="function"==typeof n?n(e,a):n}),Object.assign({},e,i)},i.context):i.context,v=n.value?this.getStateNodes(n.value):[];v.some(function(t){return t.transient})&&f.push({type:O});var l=[this].concat(v).reduce(function(t,e){return void 0!==e.data&&(t[e.id]=e.data),t},{}),d=n.value?new r(n.value,y,s?e.updateHistoryValue(s,n.value):void 0,n.source?i:void 0,I(h,this.options.actions),c,l,f):void 0;if(!d)return r.inert(i,y);i.history&&delete i.history.history;for(var g=d;f.length;){var m=g.actions,S=f.shift();(o=(g=this.transition(g,S.type===O?G:S.event,g.context)).actions).unshift.apply(o,m)}return g},e.prototype.ensureValidPaths=function(t){var e=this,n=new Map;t:for(var r=0,i=v(t.map(function(t){return e.getRelativeStateNodes(t)}));r<i.length;r++)for(var a=i[r],o=a;o.parent;){if(n.has(o.parent)){if("parallel"===o.parent.type)continue t;throw new Error("State node '"+a.id+"' shares parent '"+o.parent.id+"' with state node '"+n.get(o.parent).map(function(t){return t.id})+"'")}n.get(o.parent)?n.get(o.parent).push(a):n.set(o.parent,[a]),o=o.parent}},e.prototype.getStateNode=function(t){if(Q(t))return this.machine.getStateNodeById(t);if(!this.states)throw new Error("Unable to retrieve child state '"+t+"' from '"+this.id+"'; no child states exist.");var e=this.states[t];if(!e)throw new Error("Child state '"+t+"' does not exist on '"+this.id+"'");return e},e.prototype.getStateNodeById=function(t){var e=Q(t)?t.slice("#".length):t;if(e===this.id)return this;var n=this.machine.idMap[e];if(!n)throw new Error("Substate '#"+e+"' does not exist on '"+this.id+"'");return n},e.prototype.getStateNodeByPath=function(t){for(var e=a(t,this.delimiter),n=this;e.length;){var r=e.shift();n=n.getStateNode(r)}return n},e.prototype.resolve=function(t){var e,n=this;if("string"==typeof t){var r=this.getStateNode(t);return r.initial?((e={})[t]=r.initialStateValue,e):t}return"parallel"===this.type?u(this.initialStateValue,function(e,r){return e?n.getStateNode(r).resolve(t[r]||e):J}):u(t,function(t,e){return t?n.getStateNode(e).resolve(t):J})},Object.defineProperty(e.prototype,"resolvedStateValue",{get:function(){var t,e,n=this.key;return"parallel"===this.type?((t={})[n]=c(this.states,function(t){return t.resolvedStateValue[t.key]},function(t){return!t.history}),t):this.initial?((e={})[n]=this.states[this.initial].resolvedStateValue,e):n},enumerable:!0,configurable:!0}),e.prototype.getResolvedPath=function(t){if(Q(t)){var e=this.machine.idMap[t.slice("#".length)];if(!e)throw new Error("Unable to find state node '"+t+"'");return e.path}return a(t,this.delimiter)},Object.defineProperty(e.prototype,"initialStateValue",{get:function(){if(this.__cache.initialState)return this.__cache.initialState;var t="parallel"===this.type?c(this.states,function(t){return t.initialStateValue||J},function(t){return!t.history}):"string"==typeof this.resolvedStateValue?void 0:this.resolvedStateValue[this.key];return this.__cache.initialState=t,this.__cache.initialState},enumerable:!0,configurable:!0}),e.prototype.getState=function(t,e){var n=this;void 0===e&&(e=this.machine.context);var a={},o=[];this.getStateNodes(t).forEach(function(t){t.onEntry&&o.push.apply(o,t.onEntry),t.activities&&t.activities.forEach(function(t){a[i(t)]=!0,o.push(H(t))})});var s=o.filter(function(t){return"object"==typeof t&&(t.type===x||t.type===O)}),u=o.filter(function(t){return"object"==typeof t&&t.type===E}),c=e?u.reduce(function(t,e){var n=e.assignment,r={};return"function"==typeof n?r=n(t,{type:"init"}):Object.keys(n).forEach(function(e){var i=n[e];r[e]="function"==typeof i?i(t,{type:"init"}):i}),Object.assign({},t,r)},e):e,f=new r(t,c,void 0,void 0,I(o,this.options.actions),a,void 0,[]);return s.reduce(function(t,e){var r,i=t.actions;return(r=(t=n.transition(t,e.type===O?G:e.event,t.context)).actions).unshift.apply(r,i),t},f)},Object.defineProperty(e.prototype,"initialState",{get:function(){var t=this.initialStateValue;if(!t)throw new Error("Cannot retrieve initial state from simple state '"+this.id+"'.");var e=this.getState(t);return this.resolveTransition({value:e.value,source:void 0,entryExitStates:{entry:new Set(this.getStateNodes(e.value)),exit:new Set},actions:[],paths:[]},e)},enumerable:!0,configurable:!0}),Object.defineProperty(e.prototype,"target",{get:function(){var t;if(this.history){var e=this.config;t=e.target&&"string"==typeof e.target&&Q(e.target)?s(this.machine.getStateNodeById(e.target).path.slice(this.path.length-1)):e.target}return t},enumerable:!0,configurable:!0}),e.prototype.getStates=function(t){var e=this;if("string"==typeof t)return[this.states[t]];var n=[];return Object.keys(t).forEach(function(r){n.push.apply(n,e.states[r].getStates(t[r]))}),n},e.prototype.getRelativeStateNodes=function(t,e,n){if(void 0===n&&(n=!0),"string"==typeof t&&Q(t)){var r=this.getStateNodeById(t);return n?r.history?r.resolveHistory(e):r.initialStateNodes:[r]}var i=a(t,this.delimiter),o=(this.parent||this).getFromRelativePath(i,e);return n?v(o.map(function(t){return t.initialStateNodes})):o},Object.defineProperty(e.prototype,"initialStateNodes",{get:function(){var t=this;if("atomic"===this.type||"final"===this.type)return[this];var e=this.initialStateValue;return v(p(e).map(function(e){return t.getFromRelativePath(e)}))},enumerable:!0,configurable:!0}),e.prototype.getFromRelativePath=function(t,e){if(!t.length)return[this];var n=t[0],r=t.slice(1);if(!this.states)throw new Error("Cannot retrieve subPath '"+n+"' from node with no states");var i=this.getStateNode(n);if(i.history)return i.resolveHistory(e);if(!this.states[n])throw new Error("Child state '"+n+"' does not exist on '"+this.id+"'");return this.states[n].getFromRelativePath(r,e)},e.updateHistoryValue=function(t,e){return{current:e,states:function t(e,n){return u(e.states,function(e,r){if(e){var i=("string"==typeof n?void 0:n[r])||(e?e.current:void 0);if(i)return{current:i,states:t(e,i)}}})}(t,e)}},e.prototype.historyValue=function(t){if(Object.keys(this.states).length)return{current:t||this.initialStateValue,states:c(this.states,function(e,n){if(!t)return e.historyValue();var r="string"==typeof t?void 0:t[n];return e.historyValue(r||e.initialStateValue)},function(t){return!t.history})}},e.prototype.resolveHistory=function(t){var e=this;if(!this.history)return[this];var n=this.parent;if(!t)return this.target?v(p(this.target).map(function(t){return n.getFromRelativePath(t)})):this.parent.initialStateNodes;var r=h(n.path,"states")(t).current;return"string"==typeof r?[n.getStateNode(r)]:v(p(r).map(function(t){return"deep"===e.history?n.getFromRelativePath(t):[n.states[t[0]]]}))},Object.defineProperty(e.prototype,"stateIds",{get:function(){var t=this,e=v(Object.keys(this.states).map(function(e){return t.states[e].stateIds}));return[this.id].concat(e)},enumerable:!0,configurable:!0}),Object.defineProperty(e.prototype,"events",{get:function(){if(this.__cache.events)return this.__cache.events;var t=this.states,e=new Set(Object.keys(this.on));return t&&Object.keys(t).forEach(function(n){var r=t[n];if(r.states)for(var i=0,a=r.events;i<a.length;i++){var o=a[i];e.add(""+o)}}),this.__cache.events=Array.from(e)},enumerable:!0,configurable:!0}),e.prototype.formatTransition=function(t,e,n){var r=this,i=!!e&&e.internal;if(void 0===t||""===t)return m({},e,{actions:e?l(e.actions):[],target:void 0,internal:!e||(void 0===e.internal||e.internal),event:n});var a=l(t).map(function(t){var e="string"==typeof t&&t[0]===r.delimiter;return i=i||e,e&&!r.parent?t.slice(1):e?r.key+t:t});return m({},e,{actions:e?l(e.actions):[],target:a,internal:i,event:n})},e.prototype.formatTransitions=function(){var t=this,e=this.config.on||J,n=this.after,r=u(e,function(e,n){return void 0===e?[{target:void 0,event:n,actions:[]}]:Array.isArray(e)?e.map(function(e){return t.formatTransition(e.target,e,n)}):"string"==typeof e?[t.formatTransition([e],void 0,n)]:[t.formatTransition(e.target,e,n)]});return n.forEach(function(t){r[t.event]=r[t.event]||[],r[t.event].push(t)}),r},e}();t.Machine=function(t,e,n){return new X(t,e,n)},t.StateNode=X,t.State=r,t.matchesState=d,t.mapState=function(t,e){var n;return Object.keys(t).forEach(function(t){d(t,e)&&(!n||e.length>n.length)&&(n=t)}),t[n]},t.actions=U,Object.defineProperty(t,"__esModule",{value:!0})});

es/actions.d.ts

 import { Action, Event, EventObject, SendAction, SendActionOptions, CancelAction, ActionObject, Assigner, AssignAction, ActionFunction, ActivityActionObject, ActionTypes, ActivityDefinition } from './types';
 import * as actionTypes from './actionTypes';
 export { actionTypes };
-export declare const toEventObject: (event: Event, id?: string | number | undefined) => EventObject;
+export declare function toEventObject<TEvents extends EventObject>(event: Event<TEvents>): TEvents;
 export declare const toActionObject: <TContext>(action: Action<TContext>, actionFunctionMap?: Record<string, ActionObject<TContext> | ActionFunction<TContext>> | undefined) => ActionObject<TContext>;
 export declare function toActivityDefinition<TContext>(action: string | ActionObject<TContext> | ActivityDefinition<TContext>): ActivityDefinition<TContext>;
 export declare const toActionObjects: <TContext>(action: Action<TContext>[] | undefined, actionFunctionMap?: Record<string, ActionObject<TContext> | ActionFunction<TContext>> | undefined) => ActionObject<TContext>[];
-export declare const raise: (eventType: string | number) => EventObject;
-export declare const send: (event: Event, options?: SendActionOptions | undefined) => SendAction;
-export declare function log<TContext>(expr: (ctx: TContext, event: EventObject) => void, label?: string): {
+interface RaiseEvent<TContext, TEvents extends EventObject> extends ActionObject<TContext> {
+    event: TEvents['type'];
+}
+export declare function raise<TContext, TEvents extends EventObject>(eventType: TEvents['type']): RaiseEvent<TContext, TEvents>;
+export declare function send<TContext, TEvents extends EventObject>(event: Event<TEvents>, options?: SendActionOptions): SendAction<TContext, TEvents>;
+export declare function log<TContext, TEvents extends EventObject>(expr: (ctx: TContext, event: TEvents) => void, label?: string): {
     type: ActionTypes;
     label: string | undefined;
-    expr: (ctx: TContext, event: EventObject) => void;
+    expr: (ctx: TContext, event: TEvents) => void;
 };
@@ -18,5 +21,5 @@ export declare const cancel: (sendId: string | number) => CancelAction;
 export declare function stop<TContext>(activity: string | ActionObject<TContext> | ActivityDefinition<TContext>): ActivityActionObject<TContext>;
-export declare const assign: <TContext>(assignment: Assigner<TContext> | Partial<{ [K in keyof TContext]: ((extState: TContext, event: EventObject) => TContext[K]) | TContext[K]; }>) => AssignAction<TContext>;
+export declare const assign: <TContext, TEvents extends EventObject = EventObject>(assignment: Assigner<TContext, TEvents> | Partial<{ [K in keyof TContext]: ((extState: TContext, event: TEvents) => TContext[K]) | TContext[K]; }>) => AssignAction<TContext, TEvents>;
 export declare function isActionObject<TContext>(action: Action<TContext>): action is ActionObject<TContext>;
 export declare function after(delay: number, id?: string): string;
 export declare function done(id: string): string;

es/actions.js

@@ -15,12 +15,14 @@ var __assign = this && this.__assign || function () {
 export { actionTypes };
-export var toEventObject = function (event, id) {
+export function toEventObject(event
+// id?: TEvents['type']
+) {
     if (typeof event === 'string' || typeof event === 'number') {
         var eventObject = { type: event };
-        if (id !== undefined) {
-            eventObject.id = id;
-        }
+        // if (id !== undefined) {
+        //   eventObject.id = id;
+        // }
         return eventObject;
     }
     return event;
-};
+}
 function getActionFunction(actionType, actionFunctionMap) {
@@ -76,3 +78,3 @@ if (!actionFunctionMap) {
 };
-export var raise = function (eventType) {
+export function raise(eventType) {
     return {
@@ -82,4 +84,4 @@ type: actionTypes.raise,
     };
-};
-export var send = function (event, options) {
+}
+export function send(event, options) {
     return {
@@ -91,3 +93,3 @@ type: actionTypes.send,
     };
-};
+}
 export function log(expr, label) {
@@ -94,0 +96,0 @@ return {

es/actionTypes.d.ts

@@ -13,1 +13,2 @@ import { ActionTypes } from './types';
 export declare const log: ActionTypes;
+export declare const init: ActionTypes;

es/actionTypes.js

@@ -13,2 +13,3 @@ import { ActionTypes } from './types';
 export var doneState = ActionTypes.DoneState;
-export var log = ActionTypes.Log;
+export var log = ActionTypes.Log;
+export var init = ActionTypes.Init;

es/graph.d.ts

 import { StateNode, State } from './index';
-import { StateValue, Edge, PathMap, PathItem, PathsItem, PathsMap, AdjacencyMap, DefaultContext, ValueAdjacencyMap, Event } from './types';
+import { StateValue, Edge, PathMap, PathItem, PathsItem, PathsMap, AdjacencyMap, DefaultContext, ValueAdjacencyMap, Event, EventObject } from './types';
 export declare function getNodes(node: StateNode): StateNode[];
-export declare function getEventEdges<TContext = DefaultContext>(node: StateNode<TContext>, event: string): Array<Edge<TContext>>;
-export declare function getEdges<TContext = DefaultContext>(node: StateNode<TContext>, options?: {
+export declare function getEventEdges<TContext = DefaultContext, TEvents extends EventObject = EventObject>(node: StateNode<TContext>, event: string): Array<Edge<TContext, TEvents>>;
+export declare function getEdges<TContext = DefaultContext, TEvents extends EventObject = EventObject>(node: StateNode<TContext>, options?: {
     depth: null | number;
-}): Array<Edge<TContext>>;
+}): Array<Edge<TContext, TEvents>>;
 export declare function getAdjacencyMap<TContext = DefaultContext>(node: StateNode<TContext>, context?: TContext): AdjacencyMap;
@@ -13,8 +13,10 @@ export declare function deserializeStateString(valueContextString: string): {
 };
-export interface GetValueAdjacencyMapOptions<TContext> {
-    events: Record<string, Event[]>;
+export interface GetValueAdjacencyMapOptions<TContext, TEvents extends EventObject> {
+    events: {
+        [K in TEvents['type']]: Event<TEvents>;
+    };
     filter?: (state: State<TContext>) => boolean;
 }
-export declare function getValueAdjacencyMap<TContext = DefaultContext>(node: StateNode<TContext>, options: GetValueAdjacencyMapOptions<TContext>): ValueAdjacencyMap;
-export declare function getShortestValuePaths<TContext = DefaultContext>(machine: StateNode<TContext>, options: GetValueAdjacencyMapOptions<TContext>): PathMap;
+export declare function getValueAdjacencyMap<TContext = DefaultContext, TEvents extends EventObject = EventObject>(node: StateNode<TContext, any, TEvents>, options: GetValueAdjacencyMapOptions<TContext, TEvents>): ValueAdjacencyMap;
+export declare function getShortestValuePaths<TContext = DefaultContext, TEvents extends EventObject = EventObject>(machine: StateNode<TContext>, options: GetValueAdjacencyMapOptions<TContext, TEvents>): PathMap;
 export declare function getShortestPaths<TContext = DefaultContext>(machine: StateNode<TContext>, context?: TContext): PathMap;
@@ -21,0 +23,0 @@ export declare function getShortestPathsAsArray<TContext = DefaultContext>(machine: StateNode<TContext>, context?: TContext): PathItem[];

es/graph.js

@@ -96,2 +96,3 @@ var __rest = this && this.__rest || function (s, e) {
     }
+    // @ts-ignore - TODO: fix?
     var type = event.type,
@@ -119,3 +120,5 @@ rest = __rest(event, ["type"]);
     var adjacency = {};
-    var potentialEvents = flatten(node.events.map(function (event) {
+    var potentialEvents = flatten(
+    // @ts-ignore
+    node.events.map(function (event) {
         return events[event] || [event];
@@ -122,0 +125,0 @@ }));

es/interpreter.d.ts

@@ -1,2 +0,2 @@
-import { Machine, Event, EventObject, DefaultContext } from './types';
+import { Machine, Event, EventObject, DefaultContext, StateSchema } from './types';
 import { State } from './State';
@@ -28,8 +28,8 @@ export declare type StateListener = <TContext = DefaultContext>(state: State<TContext>) => void;
 }
-export declare class Interpreter<TContext> {
-    machine: Machine<TContext>;
+export declare class Interpreter<TContext, TStateSchema extends StateSchema = any, TEvents extends EventObject = EventObject> {
+    machine: Machine<TContext, TStateSchema, TEvents>;
     static defaultOptions: InterpreterOptions;
-    state: State<TContext>;
+    state: State<TContext, TEvents>;
     extState: TContext;
-    eventQueue: EventObject[];
+    eventQueue: TEvents[];
     delayedEventsMap: Record<string, number>;
@@ -41,3 +41,3 @@ listeners: Set<StateListener>;
     initialized: boolean;
-    constructor(machine: Machine<TContext>, listener?: StateListener, options?: Partial<InterpreterOptions>);
+    constructor(machine: Machine<TContext, TStateSchema, TEvents>, listener?: StateListener, options?: Partial<InterpreterOptions>);
     static interpret: typeof interpret;
@@ -56,6 +56,6 @@ private update;
     off(listener: StateListener): Interpreter<TContext>;
-    init: (initialState?: State<TContext>) => Interpreter<TContext>;
-    start(initialState?: State<TContext>): Interpreter<TContext>;
+    init: (initialState?: State<TContext, TEvents>) => Interpreter<TContext, any, EventObject>;
+    start(initialState?: State<TContext, TEvents>): Interpreter<TContext>;
     stop(): Interpreter<TContext>;
-    send: (event: Event) => State<TContext>;
+    send: (event: Event<TEvents>) => State<TContext, TEvents>;
     private defer;
@@ -66,3 +66,3 @@ private cancel;
 }
-export declare function interpret<TContext = DefaultContext>(machine: Machine<TContext>, listener?: StateListener, options?: Partial<InterpreterOptions>): Interpreter<TContext>;
+export declare function interpret<TContext = DefaultContext, TStateSchema extends StateSchema = any, TEvents extends EventObject = EventObject>(machine: Machine<TContext, TStateSchema, TEvents>, listener?: StateListener, options?: Partial<InterpreterOptions>): Interpreter<TContext, TStateSchema, TEvents>;
 export {};

es/interpreter.js

@@ -79,3 +79,3 @@ var __assign = this && this.__assign || function () {
             }
-            var nextState = _this.machine.transition(_this.state, eventObject, _this.extState);
+            var nextState = _this.machine.transition(_this.state, eventObject, _this.extState); // TODO: fixme
             _this.update(nextState, event);
@@ -186,6 +186,8 @@ _this.flushEventQueue();
     Interpreter.prototype.flushEventQueue = function () {
-        if (this.eventQueue.length) {
-            this.send(this.eventQueue.unshift());
+        var flushedEvent = this.eventQueue.shift();
+        if (flushedEvent) {
+            this.send(flushedEvent);
         }
     };
+    // TODO: fixme
     Interpreter.defaultOptions = {
@@ -192,0 +194,0 @@ clock: { setTimeout: setTimeout, clearTimeout: clearTimeout },

es/Machine.d.ts

@@ -1,2 +0,2 @@
-import { Machine, MachineOptions, DefaultContext, MachineConfig } from './types';
-export declare function Machine<TContext = DefaultContext>(config: MachineConfig<TContext>, options?: MachineOptions<TContext>, initialContext?: TContext): Machine<TContext>;
+import { Machine, MachineOptions, DefaultContext, MachineConfig, StateSchema, EventObject } from './types';
+export declare function Machine<TContext = DefaultContext, TStateSchema extends StateSchema = any, TEvents extends EventObject = EventObject>(config: MachineConfig<TContext, TStateSchema, TEvents>, options?: MachineOptions<TContext, TEvents>, initialContext?: TContext): Machine<TContext, TStateSchema, TEvents>;

es/patterns.d.ts

 import { SimpleStateNodeConfig } from './types';
-export declare function toggle(onState: string, offState: string, eventType: string): Record<string, SimpleStateNodeConfig<any>>;
+export declare function toggle<TEventType extends string = string>(onState: string, offState: string, eventType: TEventType): Record<string, SimpleStateNodeConfig<any, {
+    type: TEventType;
+}>>;

es/scxml.js

@@ -266,4 +266,3 @@ var __assign = this && this.__assign || function () {
     }, {}) : undefined;
-    // console.log(dataModelEl, extState);
     return Machine(__assign({}, toConfig(machineElement, '(machine)', options, extState), { delimiter: options.delimiter }), undefined, extState);
 }

es/State.d.ts

 import { StateValue, ActivityMap, EventObject, StateInterface, HistoryValue, ActionObject } from './types';
-export declare class State<TContext> implements StateInterface<TContext> {
+export declare class State<TContext, TEvents extends EventObject = EventObject> implements StateInterface<TContext> {
     value: StateValue;
     context: TContext;
     historyValue?: HistoryValue | undefined;
-    history?: State<TContext> | undefined;
+    history?: State<TContext, EventObject> | undefined;
     actions: Array<ActionObject<TContext>>;
@@ -13,13 +13,13 @@ activities: ActivityMap;
      */
-    events: EventObject[];
-    static from<T>(stateValue: State<T> | StateValue, context: T): State<T>;
-    static inert<T>(stateValue: State<T> | StateValue, ext: T): State<T>;
-    constructor(value: StateValue, context: TContext, historyValue?: HistoryValue | undefined, history?: State<TContext> | undefined, actions?: Array<ActionObject<TContext>>, activities?: ActivityMap, data?: Record<string, any>, 
+    events: TEvents[];
+    static from<TC, TE extends EventObject = EventObject>(stateValue: State<TC, TE> | StateValue, context: TC): State<TC, TE>;
+    static inert<TC, TE extends EventObject = EventObject>(stateValue: State<TC> | StateValue, ext: TC): State<TC, TE>;
+    constructor(value: StateValue, context: TContext, historyValue?: HistoryValue | undefined, history?: State<TContext, EventObject> | undefined, actions?: Array<ActionObject<TContext>>, activities?: ActivityMap, data?: Record<string, any>, 
     /**
      * Internal event queue
      */
-    events?: EventObject[]);
+    events?: TEvents[]);
     toStrings(value?: StateValue): string[];
     matches(parentStateValue: StateValue): boolean;
-    readonly changed: boolean;
+    readonly changed: boolean | undefined;
 }

es/State.js

@@ -70,5 +70,5 @@ import { EMPTY_ACTIVITY_MAP } from './constants';
             if (!this.history) {
-                return false;
+                return undefined;
             }
-            return !!this.actions.length || (typeof this.history.value !== this.value ? true : typeof this.value === 'string' ? this.value !== this.history.value : stateValuesEqual(this.value, this.history.value));
+            return !!this.actions.length || (typeof this.history.value !== typeof this.value ? true : typeof this.value === 'string' ? this.value !== this.history.value : stateValuesEqual(this.value, this.history.value));
         },
@@ -75,0 +75,0 @@ enumerable: true,

es/StateNode.d.ts

@@ -1,6 +0,6 @@
-import { Event, StateValue, Action, EventType, StateTransition, MachineOptions, EventObject, HistoryValue, DefaultData, DefaultContext, StateNodeDefinition, TransitionDefinition, DelayedTransitionDefinition, ActivityDefinition, Delay, StateTypes, StateNodeConfig } from './types';
+import { Event, StateValue, Action, StateTransition, MachineOptions, EventObject, HistoryValue, DefaultContext, StateNodeDefinition, DelayedTransitionDefinition, ActivityDefinition, Delay, StateTypes, StateNodeConfig, StateSchema, TransitionsDefinition, StateNodesConfig, AnyEvent } from './types';
 import { State } from './State';
-declare class StateNode<TContext = DefaultContext, TData = DefaultData> {
+declare class StateNode<TContext = DefaultContext, TStateSchema extends StateSchema = any, TEvents extends AnyEvent<EventObject> = AnyEvent<EventObject>> {
     private _config;
-    options: Readonly<MachineOptions<TContext>>;
+    options: Readonly<MachineOptions<TContext, TEvents>>;
     /**
@@ -14,6 +14,6 @@ * The initial extended state
     path: string[];
-    initial?: string;
+    initial?: keyof TStateSchema['states'];
     parallel: boolean;
     transient: boolean;
-    states: Record<string, StateNode<TContext>>;
+    states: StateNodesConfig<TContext, TStateSchema, TEvents>;
     history: false | 'shallow' | 'deep';
@@ -26,3 +26,5 @@ onEntry: Array<Action<TContext>>;
     machine: StateNode<TContext>;
-    data: TData;
+    data?: TStateSchema extends {
+        data: infer D;
+    } ? D : any;
     delimiter: string;
@@ -32,3 +34,3 @@ order: number;
     private idMap;
-    constructor(_config: StateNodeConfig<TContext>, options?: Readonly<MachineOptions<TContext>>, 
+    constructor(_config: StateNodeConfig<TContext, TStateSchema, TEvents>, options?: Readonly<MachineOptions<TContext, TEvents>>, 
     /**
@@ -38,12 +40,12 @@ * The initial extended state
     context?: Readonly<TContext> | undefined);
-    readonly definition: StateNodeDefinition<TContext, TData>;
-    readonly config: StateNodeConfig<TContext>;
-    readonly on: Record<string, Array<TransitionDefinition<TContext>>>;
-    readonly after: Array<DelayedTransitionDefinition<TContext>>;
-    getStateNodes(state: StateValue | State<TContext>): Array<StateNode<TContext>>;
-    handles(event: Event): boolean;
+    readonly definition: StateNodeDefinition<TContext, TStateSchema, TEvents>;
+    readonly config: StateNodeConfig<TContext, TStateSchema, TEvents>;
+    readonly on: TransitionsDefinition<TContext, TEvents>;
+    readonly after: Array<DelayedTransitionDefinition<TContext, TEvents>>;
+    getStateNodes(state: StateValue | State<TContext, TEvents>): Array<StateNode<TContext>>;
+    handles(event: Event<TEvents>): boolean;
     private transitionLeafNode;
     private transitionNestedNode;
     private transitionParallelNode;
-    _transition(stateValue: StateValue, state: State<TContext>, event: EventObject, context?: TContext): StateTransition<TContext>;
+    _transition(stateValue: StateValue, state: State<TContext, TEvents>, event: TEvents, context?: TContext): StateTransition<TContext>;
     private next;
@@ -58,3 +60,3 @@ private getStateNodeValueTree;
     private getActivities;
-    transition(state: StateValue | State<TContext>, event: Event, context?: TContext): State<TContext>;
+    transition(state: StateValue | State<TContext, TEvents>, event: Event<TEvents>, context?: TContext): State<TContext, TEvents>;
     private resolveTransition;
@@ -69,4 +71,4 @@ private ensureValidPaths;
     private readonly initialStateValue;
-    getState(stateValue: StateValue, context?: TContext): State<TContext>;
-    readonly initialState: State<TContext>;
+    getState(stateValue: StateValue, context?: TContext): State<TContext, TEvents>;
+    readonly initialState: State<TContext, TEvents>;
     readonly target: StateValue | undefined;
@@ -100,3 +102,3 @@ getStates(stateValue: StateValue): Array<StateNode<TContext>>;
     readonly stateIds: string[];
-    readonly events: EventType[];
+    readonly events: Array<TEvents['type']>;
     private formatTransition;
@@ -103,0 +105,0 @@ private formatTransitions;

es/StateNode.js

@@ -18,2 +18,3 @@ var __assign = this && this.__assign || function () {
 import { getEventType, toStatePath, toStateValue, mapValues, path, toStatePaths, pathsToStateValue, pathToStateValue, flatten, mapFilterValues, nestedPath, toArray } from './utils';
+import { ActionTypes } from './types';
 import { matchesState } from './matchesState';
@@ -600,6 +601,8 @@ import { State } from './State';
         var historyValue = currentState.historyValue ? currentState.historyValue : stateTransition.source ? this.machine.historyValue(currentState.value) : undefined;
-        try {
-            this.ensureValidPaths(stateTransition.paths);
-        } catch (e) {
-            throw new Error("Event '" + (event ? event.type : 'none') + "' leads to an invalid configuration: " + e.message);
+        if (process.env.NODE_ENV !== 'production') {
+            try {
+                this.ensureValidPaths(stateTransition.paths);
+            } catch (e) {
+                throw new Error("Event '" + (event ? event.type : 'none') + "' leads to an invalid configuration: " + e.message);
+            }
         }
@@ -621,3 +624,3 @@ var actions = this.getActions(stateTransition);
             if (typeof assignment === 'function') {
-                partialUpdate = assignment(acc, event || { type: 'xstate.init' });
+                partialUpdate = assignment(acc, event || { type: ActionTypes.Init });
             } else {
@@ -649,4 +652,6 @@ Object.keys(assignment).forEach(function (key) {
         }
-        // Dispose of previous histories to prevent memory leaks
-        delete currentState.history;
+        // Dispose of penultimate histories to prevent memory leaks
+        if (currentState.history) {
+            delete currentState.history.history;
+        }
         var maybeNextState = nextState;
@@ -752,3 +757,5 @@ while (raisedEvents.length) {
             }
-            return _b = {}, _b[key] = this.states[this.initial].resolvedStateValue, _b;
+            return _b = {},
+            // @ts-ignore TODO: fixme
+            _b[key] = this.states[this.initial].resolvedStateValue, _b;
         },
@@ -797,3 +804,3 @@ enumerable: true,
                 stateNode.activities.forEach(function (activity) {
-                    activityMap[getEventType(activity)] = true;
+                    activityMap[getEventType(activity)] = true; // TODO: fixme
                     actions.push(start(activity));
@@ -814,7 +821,8 @@ });
             if (typeof assignment === 'function') {
-                partialUpdate = assignment(acc, { type: 'init' });
+                partialUpdate = assignment(acc, { type: 'init' }); // TODO: fix init
             } else {
                 Object.keys(assignment).forEach(function (key) {
                     var propAssignment = assignment[key];
-                    partialUpdate[key] = typeof propAssignment === 'function' ? propAssignment(acc, { type: 'init' }) : propAssignment;
+                    partialUpdate[key] = typeof propAssignment === 'function' ? propAssignment(acc, { type: 'init' }) // TODO: fix init
+                    : propAssignment;
                 });
@@ -821,0 +829,0 @@ }

es/types.d.ts

 import { StateNode } from './StateNode';
 import { State } from './State';
 export declare type EventType = string | number;
-export declare type ActionType = string | number;
+export declare type ActionType = string;
 export declare type MetaObject = Record<string, any>;
-export interface EventObject {
-    type: EventType;
+export interface EventObject extends Record<string, any> {
+    type: string | number;
     id?: string | number;
-    [key: string]: any;
 }
 export interface ActionObject<TContext> extends Record<string, any> {
-    type: ActionType;
+    type: string;
     exec?: ActionFunction<TContext>;
 }
 export declare type DefaultContext = Record<string, any> | undefined;
-export declare type DefaultData = Record<string, any>;
-export declare type Event = EventType | EventObject;
-export declare type InternalEvent = EventType | EventObject;
+export declare type Event<TEvents extends EventObject> = TEvents['type'] | TEvents;
 export interface ActionFunction<TContext> {
@@ -23,4 +20,3 @@ (context: TContext, event?: EventObject): any | void;
 }
-export declare type InternalAction<TContext> = SendAction | AssignAction<TContext>;
-export declare type Action<TContext> = ActionType | ActionObject<TContext> | InternalAction<TContext> | ActionFunction<TContext>;
+export declare type Action<TContext> = ActionType | ActionObject<TContext> | ActionFunction<TContext>;
 export declare type StateKey = string | State<any>;
@@ -40,6 +36,6 @@ export interface StateValueMap {
 }
-export declare type ConditionPredicate<TContext> = (context: TContext, event: EventObject, microstepState: StateValue) => boolean;
-export declare type Condition<TContext> = string | ConditionPredicate<TContext>;
-export interface TransitionConfig<TContext = DefaultContext> {
-    cond?: Condition<TContext>;
+export declare type ConditionPredicate<TContext, TEvents extends EventObject> = (context: TContext, event: TEvents, microstepState: StateValue) => boolean;
+export declare type Condition<TContext, TEvents extends EventObject> = string | ConditionPredicate<TContext, TEvents>;
+export interface TransitionConfig<TContext, TEvents extends EventObject> {
+    cond?: Condition<TContext, TEvents>;
     actions?: SingleOrArray<Action<TContext>>;
@@ -50,7 +46,7 @@ in?: StateValue;
 }
-export interface TargetTransitionConfig<TContext = DefaultContext> extends TransitionConfig<TContext> {
+export interface TargetTransitionConfig<TContext, TEvents extends EventObject> extends TransitionConfig<TContext, TEvents> {
     target: string | string[] | undefined;
 }
-export declare type ConditionalTransitionConfig<TContext = DefaultContext> = Array<TransitionConfig<TContext>>;
-export declare type Transition<TContext = DefaultContext> = string | TransitionConfig<TContext> | ConditionalTransitionConfig<TContext>;
+export declare type ConditionalTransitionConfig<TContext = DefaultContext, TEvents extends EventObject = EventObject> = Array<TransitionConfig<TContext, TEvents>>;
+export declare type Transition<TContext, TEvents extends EventObject = EventObject> = string | TransitionConfig<TContext, TEvents> | ConditionalTransitionConfig<TContext, TEvents>;
 export interface ActivityConfig<TContext> {
@@ -62,3 +58,3 @@ start?: Action<TContext>;
 export interface ActivityDefinition<TContext> extends ActionObject<TContext> {
-    type: ActionType;
+    type: string;
     start?: ActionObject<TContext>;
@@ -71,11 +67,32 @@ stop?: ActionObject<TContext>;
 }
-export interface DelayedTransitionConfig<TContext> extends TransitionConfig<TContext> {
+export interface DelayedTransitionConfig<TContext, TEvents extends EventObject> extends TransitionConfig<TContext, TEvents> {
     delay: number;
 }
-export declare type DelayedTransitions<TContext> = Record<string, string | TransitionConfig<TContext> | Array<TransitionConfig<TContext>>> | Array<DelayedTransitionConfig<TContext>>;
+export declare type DelayedTransitions<TContext, TEvents extends EventObject> = Record<string, string | TransitionConfig<TContext, TEvents> | Array<TransitionConfig<TContext, TEvents>>> | Array<DelayedTransitionConfig<TContext, TEvents>>;
 export declare type StateTypes = 'atomic' | 'compound' | 'parallel' | 'final' | 'history';
 export declare type SingleOrArray<T> = T[] | T;
-export interface StateNodeConfig<TContext = DefaultContext, TData = any> {
+export declare type StateNodesConfig<TContext, TStateSchema extends StateSchema, TEvents extends EventObject> = {
+    [K in keyof TStateSchema['states']]: StateNode<TContext, TStateSchema['states'][K], TEvents>;
+};
+export declare type StatesConfig<TContext, TStateSchema extends StateSchema, TEvents extends EventObject> = {
+    [K in keyof TStateSchema['states']]: StateNodeConfig<TContext, TStateSchema['states'][K], TEvents>;
+};
+export declare type StatesDefinition<TContext, TStateSchema extends StateSchema, TEvents extends EventObject> = {
+    [K in keyof TStateSchema['states']]: StateNodeDefinition<TContext, TStateSchema['states'][K], TEvents>;
+};
+export declare type TransitionsConfig<TContext, TEvents extends EventObject> = {
+    [K in TEvents['type'] | BuiltInEvent<TEvents>['type']]?: string | TransitionConfig<TContext, TEvents extends {
+        type: K;
+    } ? TEvents : EventObject> | Array<TransitionConfig<TContext, TEvents extends {
+        type: K;
+    } ? TEvents : EventObject>>;
+};
+export declare type TransitionsDefinition<TContext, TEvents extends EventObject> = {
+    [K in TEvents['type']]: Array<TransitionDefinition<TContext, TEvents extends {
+        type: K;
+    } ? TEvents : EventObject>>;
+};
+export interface StateNodeConfig<TContext, TStateSchema extends StateSchema, TEvents extends EventObject> {
     key?: string;
-    initial?: string | undefined;
+    initial?: keyof TStateSchema['states'] | undefined;
     parallel?: boolean | undefined;
@@ -89,11 +106,13 @@ type?: StateTypes;
     history?: 'shallow' | 'deep' | boolean | undefined;
-    states?: Record<string, StateNodeConfig<TContext>> | undefined;
-    on?: Record<string, Transition<TContext> | undefined>;
+    states?: StatesConfig<TContext, TStateSchema, TEvents> | undefined;
+    on?: TransitionsConfig<TContext, TEvents>;
     onEntry?: SingleOrArray<Action<TContext>>;
     onExit?: SingleOrArray<Action<TContext>>;
-    after?: DelayedTransitions<TContext>;
+    after?: DelayedTransitions<TContext, TEvents>;
     activities?: SingleOrArray<Activity<TContext>>;
     parent?: StateNode<TContext>;
     strict?: boolean | undefined;
-    data?: TData;
+    data?: TStateSchema extends {
+        data: infer D;
+    } ? D : any;
     id?: string | undefined;
@@ -103,18 +122,18 @@ delimiter?: string;
 }
-export interface StateNodeDefinition<TContext = DefaultContext, TData = any> extends StateNodeConfig<TContext> {
+export interface StateNodeDefinition<TContext, TStateSchema extends StateSchema, TEvents extends EventObject> extends StateNodeConfig<TContext, TStateSchema, TEvents> {
     id: string;
     key: string;
     type: StateTypes;
-    initial: string | undefined;
+    initial: StateNodeConfig<TContext, TStateSchema, TEvents>['initial'];
     history: boolean | 'shallow' | 'deep' | undefined;
-    states: Record<string, StateNodeDefinition<TContext>>;
-    on: Record<string, Array<TransitionDefinition<TContext>>>;
+    states: StatesDefinition<TContext, TStateSchema, TEvents>;
+    on: TransitionsDefinition<TContext, TEvents>;
     onEntry: Array<Action<TContext>>;
     onExit: Array<Action<TContext>>;
-    after: Array<DelayedTransitionDefinition<TContext>>;
+    after: Array<DelayedTransitionDefinition<TContext, TEvents>>;
     activities: Array<ActivityDefinition<TContext>>;
-    data: TData;
+    data: any;
     order: number;
 }
-export interface SimpleStateNodeConfig<TContext> extends StateNodeConfig<TContext> {
+export interface SimpleStateNodeConfig<TContext, TEvents extends EventObject> extends StateNodeConfig<TContext, never, TEvents> {
     initial?: undefined;
@@ -124,24 +143,22 @@ parallel?: false | undefined;
 }
-export interface HistoryStateNodeConfig<TContext> extends SimpleStateNodeConfig<TContext> {
+export interface HistoryStateNodeConfig<TContext, TEvents extends EventObject> extends SimpleStateNodeConfig<TContext, TEvents> {
     history: 'shallow' | 'deep' | true;
     target: StateValue | undefined;
 }
-export interface CompoundStateNodeConfig<TContext> extends StateNodeConfig<TContext> {
-    initial?: string;
+export interface CompoundStateNodeConfig<TContext, TStateSchema extends StateSchema, TEvents extends EventObject> extends StateNodeConfig<TContext, TStateSchema, TEvents> {
     parallel?: boolean;
-    states: Record<string, StateNodeConfig<TContext>>;
+    states: StateNodeConfig<TContext, TStateSchema, TEvents>['states'];
 }
-export declare type SimpleOrCompoundStateNodeConfig<TContext> = SimpleStateNodeConfig<TContext> | CompoundStateNodeConfig<TContext>;
+export declare type SimpleOrCompoundStateNodeConfig<TContext, TStateSchema extends StateSchema, TEvents extends EventObject> = SimpleStateNodeConfig<TContext, TEvents> | CompoundStateNodeConfig<TContext, TStateSchema, TEvents>;
 export declare type ActionFunctionMap<TContext> = Record<string, ActionObject<TContext> | ActionFunction<TContext>>;
-export interface MachineOptions<TContext> {
-    guards?: Record<string, ConditionPredicate<TContext>>;
+export interface MachineOptions<TContext, TEvents extends EventObject> {
+    guards?: Record<string, ConditionPredicate<TContext, TEvents>>;
     actions?: ActionFunctionMap<TContext>;
     activities?: Record<string, ActivityConfig<TContext>>;
 }
-export declare type MachineConfig<TContext> = CompoundStateNodeConfig<TContext>;
-export interface StandardMachineConfig<TContext> extends CompoundStateNodeConfig<TContext> {
+export declare type MachineConfig<TContext, TStateSchema extends StateSchema, TEvents extends EventObject> = CompoundStateNodeConfig<TContext, TStateSchema, TEvents>;
+export interface StandardMachineConfig<TContext, TStateSchema extends StateSchema, TEvents extends EventObject> extends CompoundStateNodeConfig<TContext, TStateSchema, TEvents> {
 }
-export interface ParallelMachineConfig<TContext> extends CompoundStateNodeConfig<TContext> {
-    initial?: string | undefined;
-    parallel?: true;
+export interface ParallelMachineConfig<TContext, TStateSchema extends StateSchema, TEvents extends EventObject> extends CompoundStateNodeConfig<TContext, TStateSchema, TEvents> {
+    initial?: undefined;
     type?: 'parallel';
@@ -153,12 +170,2 @@ }
 }
-export interface ComplexStateNode<TContext> extends StateNode<TContext> {
-    initial: string;
-    history: false;
-}
-export interface LeafStateNode<TContext> extends StateNode<TContext> {
-    initial: never;
-    parallel: never;
-    states: never;
-    parent: StateNode<TContext>;
-}
 export interface HistoryStateNode<TContext> extends StateNode<TContext> {
@@ -168,14 +175,6 @@ history: 'shallow' | 'deep';
 }
-export interface Machine<TContext = DefaultContext> extends StateNode<TContext> {
+export interface Machine<TContext, TStateSchema extends StateSchema, TEvents extends EventObject> extends StateNode<TContext, TStateSchema, TEvents> {
     id: string;
-    states: Record<string, StateNode<TContext>>;
+    states: StateNode<TContext, TStateSchema, TEvents>['states'];
 }
-export interface StandardMachine<TContext> extends Machine<TContext> {
-    initial: string;
-    parallel: false;
-}
-export interface ParallelMachine<TContext> extends Machine<TContext> {
-    initial: undefined;
-    parallel: true;
-}
 export interface ActionMap<TContext> {
@@ -193,3 +192,2 @@ onEntry: Array<Action<TContext>>;
 }
-export declare type MaybeStateValueActionsTuple<TContext> = [StateValue | undefined, ActionMap<TContext>, ActivityMap | undefined];
 export interface StateTransition<TContext> {
@@ -213,8 +211,19 @@ value: StateValue | undefined;
     Cancel = "xstate.cancel",
-    Null = "xstate.null",
+    Null = "",
     Assign = "xstate.assign",
     After = "xstate.after",
     DoneState = "done.state",
-    Log = "xstate.log"
+    Log = "xstate.log",
+    Init = "xstate.init"
 }
+export interface RaisedEvent<TEvents extends EventObject> {
+    type: ActionTypes.Raise;
+    event: TEvents;
+}
+export declare type BuiltInEvent<TEvents extends EventObject> = {
+    type: ActionTypes.Null;
+} | RaisedEvent<TEvents> | {
+    type: ActionTypes.Init;
+};
+export declare type AnyEvent<TEvents extends EventObject> = TEvents | BuiltInEvent<TEvents>;
 export interface ActivityActionObject<TContext> extends ActionObject<TContext> {
@@ -225,4 +234,4 @@ type: ActionTypes.Start | ActionTypes.Stop;
 }
-export interface SendAction extends ActionObject<any> {
-    event: EventObject;
+export interface SendAction<TContext, TEvents extends EventObject> extends ActionObject<TContext> {
+    event: TEvents;
     delay?: number;
@@ -238,10 +247,10 @@ id: string | number;
 }
-export declare type Assigner<TContext> = (extState: TContext, event: EventObject) => Partial<TContext>;
-export declare type PropertyAssigner<TContext> = Partial<{
-    [K in keyof TContext]: ((extState: TContext, event: EventObject) => TContext[K]) | TContext[K];
+export declare type Assigner<TContext, TEvents extends EventObject> = (extState: TContext, event: TEvents) => Partial<TContext>;
+export declare type PropertyAssigner<TContext, TEvents extends EventObject> = Partial<{
+    [K in keyof TContext]: ((extState: TContext, event: TEvents) => TContext[K]) | TContext[K];
 }>;
-export interface AssignAction<TContext> extends ActionObject<TContext> {
-    assignment: Assigner<TContext> | PropertyAssigner<TContext>;
+export interface AssignAction<TContext, TEvents extends EventObject> extends ActionObject<TContext> {
+    assignment: Assigner<TContext, TEvents> | PropertyAssigner<TContext, TEvents>;
 }
-export interface TransitionDefinition<TContext> extends TransitionConfig<TContext> {
+export interface TransitionDefinition<TContext, TEvents extends EventObject> extends TransitionConfig<TContext, TEvents> {
     actions: Array<Action<TContext>>;
@@ -251,19 +260,21 @@ event: string;
 }
-export interface DelayedTransitionDefinition<TContext> extends TransitionDefinition<TContext> {
+export interface DelayedTransitionDefinition<TContext, TEvents extends EventObject> extends TransitionDefinition<TContext, TEvents> {
     delay: number;
 }
-export interface Edge<TContext> {
-    event: string;
+export interface Edge<TContext, TEvents extends EventObject, TEventType extends TEvents['type'] = string> {
+    event: TEventType;
     source: StateNode<TContext>;
     target: StateNode<TContext>;
-    cond?: Condition<TContext>;
+    cond?: Condition<TContext, TEvents & {
+        type: TEventType;
+    }>;
     actions: Array<Action<TContext>>;
     meta?: MetaObject;
-    transition: TransitionDefinition<TContext>;
+    transition: TransitionDefinition<TContext, TEvents>;
 }
-export interface NodesAndEdges<TContext> {
+export interface NodesAndEdges<TContext, TEvents extends EventObject> {
     nodes: StateNode[];
-    edges: Array<Edge<TContext>>;
+    edges: Array<Edge<TContext, TEvents, TEvents['type']>>;
 }
-export interface Segment<TContext = DefaultContext> {
+export interface Segment<TContext = DefaultContext, TEvents extends EventObject = EventObject> {
     /**
@@ -278,3 +289,3 @@ * From state
      */
-    event: Event;
+    event: Event<TEvents>;
 }
@@ -308,3 +319,3 @@ export interface PathMap {
 }
-export interface StateInterface<TContext = DefaultContext, TData = DefaultData> {
+export interface StateInterface<TContext = DefaultContext, TEvents extends EventObject = EventObject> {
     value: StateValue;
@@ -314,6 +325,12 @@ history?: State<TContext>;
     activities: ActivityMap;
-    data: TData;
-    events: EventObject[];
+    data: any;
+    events: TEvents[];
     context: TContext;
     toStrings: () => string[];
 }
+export interface StateSchema {
+    data?: any;
+    states?: {
+        [key: string]: StateSchema;
+    };
+}

es/types.js

@@ -8,3 +8,3 @@ export var ActionTypes;
     ActionTypes["Cancel"] = "xstate.cancel";
-    ActionTypes["Null"] = "xstate.null";
+    ActionTypes["Null"] = "";
     ActionTypes["Assign"] = "xstate.assign";
@@ -14,2 +14,3 @@ ActionTypes["After"] = "xstate.after";
     ActionTypes["Log"] = "xstate.log";
+    ActionTypes["Init"] = "xstate.init";
 })(ActionTypes || (ActionTypes = {}));

es/utils.d.ts

 import { State } from './State';
-import { Event, StateValue, EventType, ActionType, Action } from './types';
-export declare function getEventType(event: Event): EventType;
+import { Event, StateValue, ActionType, Action, EventObject } from './types';
+export declare function getEventType<TEvents extends EventObject = EventObject>(event: Event<TEvents>): TEvents['type'];
 export declare function getActionType(action: Action<any>): ActionType;
@@ -5,0 +5,0 @@ export declare function toStatePath(stateId: string | string[], delimiter: string): string[];

lib/actions.d.ts

 import { Action, Event, EventObject, SendAction, SendActionOptions, CancelAction, ActionObject, Assigner, AssignAction, ActionFunction, ActivityActionObject, ActionTypes, ActivityDefinition } from './types';
 import * as actionTypes from './actionTypes';
 export { actionTypes };
-export declare const toEventObject: (event: Event, id?: string | number | undefined) => EventObject;
+export declare function toEventObject<TEvents extends EventObject>(event: Event<TEvents>): TEvents;
 export declare const toActionObject: <TContext>(action: Action<TContext>, actionFunctionMap?: Record<string, ActionObject<TContext> | ActionFunction<TContext>> | undefined) => ActionObject<TContext>;
 export declare function toActivityDefinition<TContext>(action: string | ActionObject<TContext> | ActivityDefinition<TContext>): ActivityDefinition<TContext>;
 export declare const toActionObjects: <TContext>(action: Action<TContext>[] | undefined, actionFunctionMap?: Record<string, ActionObject<TContext> | ActionFunction<TContext>> | undefined) => ActionObject<TContext>[];
-export declare const raise: (eventType: string | number) => EventObject;
-export declare const send: (event: Event, options?: SendActionOptions | undefined) => SendAction;
-export declare function log<TContext>(expr: (ctx: TContext, event: EventObject) => void, label?: string): {
+interface RaiseEvent<TContext, TEvents extends EventObject> extends ActionObject<TContext> {
+    event: TEvents['type'];
+}
+export declare function raise<TContext, TEvents extends EventObject>(eventType: TEvents['type']): RaiseEvent<TContext, TEvents>;
+export declare function send<TContext, TEvents extends EventObject>(event: Event<TEvents>, options?: SendActionOptions): SendAction<TContext, TEvents>;
+export declare function log<TContext, TEvents extends EventObject>(expr: (ctx: TContext, event: TEvents) => void, label?: string): {
     type: ActionTypes;
     label: string | undefined;
-    expr: (ctx: TContext, event: EventObject) => void;
+    expr: (ctx: TContext, event: TEvents) => void;
 };
@@ -18,5 +21,5 @@ export declare const cancel: (sendId: string | number) => CancelAction;
 export declare function stop<TContext>(activity: string | ActionObject<TContext> | ActivityDefinition<TContext>): ActivityActionObject<TContext>;
-export declare const assign: <TContext>(assignment: Assigner<TContext> | Partial<{ [K in keyof TContext]: ((extState: TContext, event: EventObject) => TContext[K]) | TContext[K]; }>) => AssignAction<TContext>;
+export declare const assign: <TContext, TEvents extends EventObject = EventObject>(assignment: Assigner<TContext, TEvents> | Partial<{ [K in keyof TContext]: ((extState: TContext, event: TEvents) => TContext[K]) | TContext[K]; }>) => AssignAction<TContext, TEvents>;
 export declare function isActionObject<TContext>(action: Action<TContext>): action is ActionObject<TContext>;
 export declare function after(delay: number, id?: string): string;
 export declare function done(id: string): string;

lib/actions.js

@@ -18,12 +18,15 @@ "use strict";
 var utils_1 = require("./utils");
-exports.toEventObject = function (event, id) {
+function toEventObject(event
+// id?: TEvents['type']
+) {
     if (typeof event === 'string' || typeof event === 'number') {
         var eventObject = { type: event };
-        if (id !== undefined) {
-            eventObject.id = id;
-        }
+        // if (id !== undefined) {
+        //   eventObject.id = id;
+        // }
         return eventObject;
     }
     return event;
-};
+}
+exports.toEventObject = toEventObject;
 function getActionFunction(actionType, actionFunctionMap) {
@@ -83,14 +86,20 @@ if (!actionFunctionMap) {
 };
-exports.raise = function (eventType) { return ({
-    type: actionTypes.raise,
-    event: eventType
-}); };
-exports.send = function (event, options) {
+function raise(eventType) {
     return {
+        type: actionTypes.raise,
+        event: eventType
+    };
+}
+exports.raise = raise;
+function send(event, options) {
+    return {
         type: actionTypes.send,
-        event: exports.toEventObject(event),
+        event: toEventObject(event),
         delay: options ? options.delay : undefined,
-        id: options && options.id !== undefined ? options.id : utils_1.getEventType(event)
+        id: options && options.id !== undefined
+            ? options.id
+            : utils_1.getEventType(event)
     };
-};
+}
+exports.send = send;
 function log(expr, label) {
@@ -97,0 +106,0 @@ return {

lib/actionTypes.d.ts

@@ -13,1 +13,2 @@ import { ActionTypes } from './types';
 export declare const log: ActionTypes;
+export declare const init: ActionTypes;

lib/actionTypes.js

@@ -16,1 +16,2 @@ "use strict";
 exports.log = types_1.ActionTypes.Log;
+exports.init = types_1.ActionTypes.Init;

lib/graph.d.ts

 import { StateNode, State } from './index';
-import { StateValue, Edge, PathMap, PathItem, PathsItem, PathsMap, AdjacencyMap, DefaultContext, ValueAdjacencyMap, Event } from './types';
+import { StateValue, Edge, PathMap, PathItem, PathsItem, PathsMap, AdjacencyMap, DefaultContext, ValueAdjacencyMap, Event, EventObject } from './types';
 export declare function getNodes(node: StateNode): StateNode[];
-export declare function getEventEdges<TContext = DefaultContext>(node: StateNode<TContext>, event: string): Array<Edge<TContext>>;
-export declare function getEdges<TContext = DefaultContext>(node: StateNode<TContext>, options?: {
+export declare function getEventEdges<TContext = DefaultContext, TEvents extends EventObject = EventObject>(node: StateNode<TContext>, event: string): Array<Edge<TContext, TEvents>>;
+export declare function getEdges<TContext = DefaultContext, TEvents extends EventObject = EventObject>(node: StateNode<TContext>, options?: {
     depth: null | number;
-}): Array<Edge<TContext>>;
+}): Array<Edge<TContext, TEvents>>;
 export declare function getAdjacencyMap<TContext = DefaultContext>(node: StateNode<TContext>, context?: TContext): AdjacencyMap;
@@ -13,8 +13,10 @@ export declare function deserializeStateString(valueContextString: string): {
 };
-export interface GetValueAdjacencyMapOptions<TContext> {
-    events: Record<string, Event[]>;
+export interface GetValueAdjacencyMapOptions<TContext, TEvents extends EventObject> {
+    events: {
+        [K in TEvents['type']]: Event<TEvents>;
+    };
     filter?: (state: State<TContext>) => boolean;
 }
-export declare function getValueAdjacencyMap<TContext = DefaultContext>(node: StateNode<TContext>, options: GetValueAdjacencyMapOptions<TContext>): ValueAdjacencyMap;
-export declare function getShortestValuePaths<TContext = DefaultContext>(machine: StateNode<TContext>, options: GetValueAdjacencyMapOptions<TContext>): PathMap;
+export declare function getValueAdjacencyMap<TContext = DefaultContext, TEvents extends EventObject = EventObject>(node: StateNode<TContext, any, TEvents>, options: GetValueAdjacencyMapOptions<TContext, TEvents>): ValueAdjacencyMap;
+export declare function getShortestValuePaths<TContext = DefaultContext, TEvents extends EventObject = EventObject>(machine: StateNode<TContext>, options: GetValueAdjacencyMapOptions<TContext, TEvents>): PathMap;
 export declare function getShortestPaths<TContext = DefaultContext>(machine: StateNode<TContext>, context?: TContext): PathMap;
@@ -21,0 +23,0 @@ export declare function getShortestPathsAsArray<TContext = DefaultContext>(machine: StateNode<TContext>, context?: TContext): PathItem[];

lib/graph.js

@@ -116,2 +116,3 @@ "use strict";
     }
+    // @ts-ignore - TODO: fix?
     var type = event.type, rest = __rest(event, ["type"]);
@@ -135,3 +136,5 @@ return type + " | " + JSON.stringify(rest);
     var adjacency = {};
-    var potentialEvents = utils_1.flatten(node.events.map(function (event) { return events[event] || [event]; }));
+    var potentialEvents = utils_1.flatten(
+    // @ts-ignore
+    node.events.map(function (event) { return events[event] || [event]; }));
     function findAdjacencies(state) {
@@ -138,0 +141,0 @@ var stateKey = serializeState(state);

lib/interpreter.d.ts

@@ -1,2 +0,2 @@
-import { Machine, Event, EventObject, DefaultContext } from './types';
+import { Machine, Event, EventObject, DefaultContext, StateSchema } from './types';
 import { State } from './State';
@@ -28,8 +28,8 @@ export declare type StateListener = <TContext = DefaultContext>(state: State<TContext>) => void;
 }
-export declare class Interpreter<TContext> {
-    machine: Machine<TContext>;
+export declare class Interpreter<TContext, TStateSchema extends StateSchema = any, TEvents extends EventObject = EventObject> {
+    machine: Machine<TContext, TStateSchema, TEvents>;
     static defaultOptions: InterpreterOptions;
-    state: State<TContext>;
+    state: State<TContext, TEvents>;
     extState: TContext;
-    eventQueue: EventObject[];
+    eventQueue: TEvents[];
     delayedEventsMap: Record<string, number>;
@@ -41,3 +41,3 @@ listeners: Set<StateListener>;
     initialized: boolean;
-    constructor(machine: Machine<TContext>, listener?: StateListener, options?: Partial<InterpreterOptions>);
+    constructor(machine: Machine<TContext, TStateSchema, TEvents>, listener?: StateListener, options?: Partial<InterpreterOptions>);
     static interpret: typeof interpret;
@@ -56,6 +56,6 @@ private update;
     off(listener: StateListener): Interpreter<TContext>;
-    init: (initialState?: State<TContext>) => Interpreter<TContext>;
-    start(initialState?: State<TContext>): Interpreter<TContext>;
+    init: (initialState?: State<TContext, TEvents>) => Interpreter<TContext, any, EventObject>;
+    start(initialState?: State<TContext, TEvents>): Interpreter<TContext>;
     stop(): Interpreter<TContext>;
-    send: (event: Event) => State<TContext>;
+    send: (event: Event<TEvents>) => State<TContext, TEvents>;
     private defer;
@@ -66,3 +66,3 @@ private cancel;
 }
-export declare function interpret<TContext = DefaultContext>(machine: Machine<TContext>, listener?: StateListener, options?: Partial<InterpreterOptions>): Interpreter<TContext>;
+export declare function interpret<TContext = DefaultContext, TStateSchema extends StateSchema = any, TEvents extends EventObject = EventObject>(machine: Machine<TContext, TStateSchema, TEvents>, listener?: StateListener, options?: Partial<InterpreterOptions>): Interpreter<TContext, TStateSchema, TEvents>;
 export {};

lib/interpreter.js

@@ -80,3 +80,3 @@ "use strict";
             }
-            var nextState = _this.machine.transition(_this.state, eventObject, _this.extState);
+            var nextState = _this.machine.transition(_this.state, eventObject, _this.extState); // TODO: fixme
             _this.update(nextState, event);
@@ -181,6 +181,8 @@ _this.flushEventQueue();
     Interpreter.prototype.flushEventQueue = function () {
-        if (this.eventQueue.length) {
-            this.send(this.eventQueue.unshift());
+        var flushedEvent = this.eventQueue.shift();
+        if (flushedEvent) {
+            this.send(flushedEvent);
         }
     };
+    // TODO: fixme
     Interpreter.defaultOptions = {
@@ -187,0 +189,0 @@ clock: { setTimeout: setTimeout, clearTimeout: clearTimeout },

lib/Machine.d.ts

@@ -1,2 +0,2 @@
-import { Machine, MachineOptions, DefaultContext, MachineConfig } from './types';
-export declare function Machine<TContext = DefaultContext>(config: MachineConfig<TContext>, options?: MachineOptions<TContext>, initialContext?: TContext): Machine<TContext>;
+import { Machine, MachineOptions, DefaultContext, MachineConfig, StateSchema, EventObject } from './types';
+export declare function Machine<TContext = DefaultContext, TStateSchema extends StateSchema = any, TEvents extends EventObject = EventObject>(config: MachineConfig<TContext, TStateSchema, TEvents>, options?: MachineOptions<TContext, TEvents>, initialContext?: TContext): Machine<TContext, TStateSchema, TEvents>;

lib/patterns.d.ts

 import { SimpleStateNodeConfig } from './types';
-export declare function toggle(onState: string, offState: string, eventType: string): Record<string, SimpleStateNodeConfig<any>>;
+export declare function toggle<TEventType extends string = string>(onState: string, offState: string, eventType: TEventType): Record<string, SimpleStateNodeConfig<any, {
+    type: TEventType;
+}>>;

lib/scxml.js

@@ -286,5 +286,4 @@ "use strict";
         : undefined;
-    // console.log(dataModelEl, extState);
     return index_1.Machine(__assign({}, toConfig(machineElement, '(machine)', options, extState), { delimiter: options.delimiter }), undefined, extState);
 }
 exports.toMachine = toMachine;

lib/State.d.ts

 import { StateValue, ActivityMap, EventObject, StateInterface, HistoryValue, ActionObject } from './types';
-export declare class State<TContext> implements StateInterface<TContext> {
+export declare class State<TContext, TEvents extends EventObject = EventObject> implements StateInterface<TContext> {
     value: StateValue;
     context: TContext;
     historyValue?: HistoryValue | undefined;
-    history?: State<TContext> | undefined;
+    history?: State<TContext, EventObject> | undefined;
     actions: Array<ActionObject<TContext>>;
@@ -13,13 +13,13 @@ activities: ActivityMap;
      */
-    events: EventObject[];
-    static from<T>(stateValue: State<T> | StateValue, context: T): State<T>;
-    static inert<T>(stateValue: State<T> | StateValue, ext: T): State<T>;
-    constructor(value: StateValue, context: TContext, historyValue?: HistoryValue | undefined, history?: State<TContext> | undefined, actions?: Array<ActionObject<TContext>>, activities?: ActivityMap, data?: Record<string, any>, 
+    events: TEvents[];
+    static from<TC, TE extends EventObject = EventObject>(stateValue: State<TC, TE> | StateValue, context: TC): State<TC, TE>;
+    static inert<TC, TE extends EventObject = EventObject>(stateValue: State<TC> | StateValue, ext: TC): State<TC, TE>;
+    constructor(value: StateValue, context: TContext, historyValue?: HistoryValue | undefined, history?: State<TContext, EventObject> | undefined, actions?: Array<ActionObject<TContext>>, activities?: ActivityMap, data?: Record<string, any>, 
     /**
      * Internal event queue
      */
-    events?: EventObject[]);
+    events?: TEvents[]);
     toStrings(value?: StateValue): string[];
     matches(parentStateValue: StateValue): boolean;
-    readonly changed: boolean;
+    readonly changed: boolean | undefined;
 }

lib/State.js

@@ -58,6 +58,6 @@ "use strict";
             if (!this.history) {
-                return false;
+                return undefined;
             }
             return (!!this.actions.length ||
-                (typeof this.history.value !== this.value
+                (typeof this.history.value !== typeof this.value
                     ? true
@@ -64,0 +64,0 @@ : typeof this.value === 'string'

lib/StateNode.d.ts

@@ -1,6 +0,6 @@
-import { Event, StateValue, Action, EventType, StateTransition, MachineOptions, EventObject, HistoryValue, DefaultData, DefaultContext, StateNodeDefinition, TransitionDefinition, DelayedTransitionDefinition, ActivityDefinition, Delay, StateTypes, StateNodeConfig } from './types';
+import { Event, StateValue, Action, StateTransition, MachineOptions, EventObject, HistoryValue, DefaultContext, StateNodeDefinition, DelayedTransitionDefinition, ActivityDefinition, Delay, StateTypes, StateNodeConfig, StateSchema, TransitionsDefinition, StateNodesConfig, AnyEvent } from './types';
 import { State } from './State';
-declare class StateNode<TContext = DefaultContext, TData = DefaultData> {
+declare class StateNode<TContext = DefaultContext, TStateSchema extends StateSchema = any, TEvents extends AnyEvent<EventObject> = AnyEvent<EventObject>> {
     private _config;
-    options: Readonly<MachineOptions<TContext>>;
+    options: Readonly<MachineOptions<TContext, TEvents>>;
     /**
@@ -14,6 +14,6 @@ * The initial extended state
     path: string[];
-    initial?: string;
+    initial?: keyof TStateSchema['states'];
     parallel: boolean;
     transient: boolean;
-    states: Record<string, StateNode<TContext>>;
+    states: StateNodesConfig<TContext, TStateSchema, TEvents>;
     history: false | 'shallow' | 'deep';
@@ -26,3 +26,5 @@ onEntry: Array<Action<TContext>>;
     machine: StateNode<TContext>;
-    data: TData;
+    data?: TStateSchema extends {
+        data: infer D;
+    } ? D : any;
     delimiter: string;
@@ -32,3 +34,3 @@ order: number;
     private idMap;
-    constructor(_config: StateNodeConfig<TContext>, options?: Readonly<MachineOptions<TContext>>, 
+    constructor(_config: StateNodeConfig<TContext, TStateSchema, TEvents>, options?: Readonly<MachineOptions<TContext, TEvents>>, 
     /**
@@ -38,12 +40,12 @@ * The initial extended state
     context?: Readonly<TContext> | undefined);
-    readonly definition: StateNodeDefinition<TContext, TData>;
-    readonly config: StateNodeConfig<TContext>;
-    readonly on: Record<string, Array<TransitionDefinition<TContext>>>;
-    readonly after: Array<DelayedTransitionDefinition<TContext>>;
-    getStateNodes(state: StateValue | State<TContext>): Array<StateNode<TContext>>;
-    handles(event: Event): boolean;
+    readonly definition: StateNodeDefinition<TContext, TStateSchema, TEvents>;
+    readonly config: StateNodeConfig<TContext, TStateSchema, TEvents>;
+    readonly on: TransitionsDefinition<TContext, TEvents>;
+    readonly after: Array<DelayedTransitionDefinition<TContext, TEvents>>;
+    getStateNodes(state: StateValue | State<TContext, TEvents>): Array<StateNode<TContext>>;
+    handles(event: Event<TEvents>): boolean;
     private transitionLeafNode;
     private transitionNestedNode;
     private transitionParallelNode;
-    _transition(stateValue: StateValue, state: State<TContext>, event: EventObject, context?: TContext): StateTransition<TContext>;
+    _transition(stateValue: StateValue, state: State<TContext, TEvents>, event: TEvents, context?: TContext): StateTransition<TContext>;
     private next;
@@ -58,3 +60,3 @@ private getStateNodeValueTree;
     private getActivities;
-    transition(state: StateValue | State<TContext>, event: Event, context?: TContext): State<TContext>;
+    transition(state: StateValue | State<TContext, TEvents>, event: Event<TEvents>, context?: TContext): State<TContext, TEvents>;
     private resolveTransition;
@@ -69,4 +71,4 @@ private ensureValidPaths;
     private readonly initialStateValue;
-    getState(stateValue: StateValue, context?: TContext): State<TContext>;
-    readonly initialState: State<TContext>;
+    getState(stateValue: StateValue, context?: TContext): State<TContext, TEvents>;
+    readonly initialState: State<TContext, TEvents>;
     readonly target: StateValue | undefined;
@@ -100,3 +102,3 @@ getStates(stateValue: StateValue): Array<StateNode<TContext>>;
     readonly stateIds: string[];
-    readonly events: EventType[];
+    readonly events: Array<TEvents['type']>;
     private formatTransition;
@@ -103,0 +105,0 @@ private formatTransitions;

lib/StateNode.js

@@ -24,2 +24,3 @@ "use strict";
 var utils_1 = require("./utils");
+var types_1 = require("./types");
 var matchesState_1 = require("./matchesState");
@@ -390,3 +391,4 @@ var State_1 = require("./State");
         var entryExitStates = nextStateNodes.reduce(function (allEntryExitStates, nextStateNode) {
-            var _a = _this.getEntryExitStates(nextStateNode, !!selectedTransition.internal), entry = _a.entry, exit = _a.exit;
+            var _a = _this.getEntryExitStates(nextStateNode, !!selectedTransition
+                .internal), entry = _a.entry, exit = _a.exit;
             return {
@@ -604,8 +606,10 @@ entry: new Set(Array.from(allEntryExitStates.entry).concat(Array.from(entry))),
                 : undefined;
-        try {
-            this.ensureValidPaths(stateTransition.paths);
+        if (process.env.NODE_ENV !== 'production') {
+            try {
+                this.ensureValidPaths(stateTransition.paths);
+            }
+            catch (e) {
+                throw new Error("Event '" + (event ? event.type : 'none') + "' leads to an invalid configuration: " + e.message);
+            }
         }
-        catch (e) {
-            throw new Error("Event '" + (event ? event.type : 'none') + "' leads to an invalid configuration: " + e.message);
-        }
         var actions = this.getActions(stateTransition);
@@ -629,3 +633,3 @@ var activities = this.getActivities(stateTransition.entryExitStates, currentState.activities);
                 if (typeof assignment === 'function') {
-                    partialUpdate = assignment(acc, event || { type: 'xstate.init' });
+                    partialUpdate = assignment(acc, event || { type: types_1.ActionTypes.Init });
                 }
@@ -666,4 +670,6 @@ else {
         }
-        // Dispose of previous histories to prevent memory leaks
-        delete currentState.history;
+        // Dispose of penultimate histories to prevent memory leaks
+        if (currentState.history) {
+            delete currentState.history.history;
+        }
         var maybeNextState = nextState;
@@ -673,3 +679,5 @@ while (raisedEvents.length) {
             var raisedEvent = raisedEvents.shift();
-            maybeNextState = this.transition(maybeNextState, raisedEvent.type === actionTypes.null ? NULL_EVENT : raisedEvent.event, maybeNextState.context);
+            maybeNextState = this.transition(maybeNextState, raisedEvent.type === actionTypes.null
+                ? NULL_EVENT
+                : raisedEvent.event, maybeNextState.context);
             (_a = maybeNextState.actions).unshift.apply(_a, currentActions);
@@ -775,2 +783,3 @@ }
             return _b = {},
+                // @ts-ignore TODO: fixme
                 _b[key] = this.states[this.initial].resolvedStateValue,
@@ -819,3 +828,3 @@ _b;
                 stateNode.activities.forEach(function (activity) {
-                    activityMap[utils_1.getEventType(activity)] = true;
+                    activityMap[utils_1.getEventType(activity)] = true; // TODO: fixme
                     actions.push(actions_1.start(activity));
@@ -836,3 +845,3 @@ });
                 if (typeof assignment === 'function') {
-                    partialUpdate = assignment(acc, { type: 'init' });
+                    partialUpdate = assignment(acc, { type: 'init' }); // TODO: fix init
                 }
@@ -844,3 +853,3 @@ else {
                             typeof propAssignment === 'function'
-                                ? propAssignment(acc, { type: 'init' })
+                                ? propAssignment(acc, { type: 'init' }) // TODO: fix init
                                 : propAssignment;
@@ -847,0 +856,0 @@ });

lib/types.d.ts

 import { StateNode } from './StateNode';
 import { State } from './State';
 export declare type EventType = string | number;
-export declare type ActionType = string | number;
+export declare type ActionType = string;
 export declare type MetaObject = Record<string, any>;
-export interface EventObject {
-    type: EventType;
+export interface EventObject extends Record<string, any> {
+    type: string | number;
     id?: string | number;
-    [key: string]: any;
 }
 export interface ActionObject<TContext> extends Record<string, any> {
-    type: ActionType;
+    type: string;
     exec?: ActionFunction<TContext>;
 }
 export declare type DefaultContext = Record<string, any> | undefined;
-export declare type DefaultData = Record<string, any>;
-export declare type Event = EventType | EventObject;
-export declare type InternalEvent = EventType | EventObject;
+export declare type Event<TEvents extends EventObject> = TEvents['type'] | TEvents;
 export interface ActionFunction<TContext> {
@@ -23,4 +20,3 @@ (context: TContext, event?: EventObject): any | void;
 }
-export declare type InternalAction<TContext> = SendAction | AssignAction<TContext>;
-export declare type Action<TContext> = ActionType | ActionObject<TContext> | InternalAction<TContext> | ActionFunction<TContext>;
+export declare type Action<TContext> = ActionType | ActionObject<TContext> | ActionFunction<TContext>;
 export declare type StateKey = string | State<any>;
@@ -40,6 +36,6 @@ export interface StateValueMap {
 }
-export declare type ConditionPredicate<TContext> = (context: TContext, event: EventObject, microstepState: StateValue) => boolean;
-export declare type Condition<TContext> = string | ConditionPredicate<TContext>;
-export interface TransitionConfig<TContext = DefaultContext> {
-    cond?: Condition<TContext>;
+export declare type ConditionPredicate<TContext, TEvents extends EventObject> = (context: TContext, event: TEvents, microstepState: StateValue) => boolean;
+export declare type Condition<TContext, TEvents extends EventObject> = string | ConditionPredicate<TContext, TEvents>;
+export interface TransitionConfig<TContext, TEvents extends EventObject> {
+    cond?: Condition<TContext, TEvents>;
     actions?: SingleOrArray<Action<TContext>>;
@@ -50,7 +46,7 @@ in?: StateValue;
 }
-export interface TargetTransitionConfig<TContext = DefaultContext> extends TransitionConfig<TContext> {
+export interface TargetTransitionConfig<TContext, TEvents extends EventObject> extends TransitionConfig<TContext, TEvents> {
     target: string | string[] | undefined;
 }
-export declare type ConditionalTransitionConfig<TContext = DefaultContext> = Array<TransitionConfig<TContext>>;
-export declare type Transition<TContext = DefaultContext> = string | TransitionConfig<TContext> | ConditionalTransitionConfig<TContext>;
+export declare type ConditionalTransitionConfig<TContext = DefaultContext, TEvents extends EventObject = EventObject> = Array<TransitionConfig<TContext, TEvents>>;
+export declare type Transition<TContext, TEvents extends EventObject = EventObject> = string | TransitionConfig<TContext, TEvents> | ConditionalTransitionConfig<TContext, TEvents>;
 export interface ActivityConfig<TContext> {
@@ -62,3 +58,3 @@ start?: Action<TContext>;
 export interface ActivityDefinition<TContext> extends ActionObject<TContext> {
-    type: ActionType;
+    type: string;
     start?: ActionObject<TContext>;
@@ -71,11 +67,32 @@ stop?: ActionObject<TContext>;
 }
-export interface DelayedTransitionConfig<TContext> extends TransitionConfig<TContext> {
+export interface DelayedTransitionConfig<TContext, TEvents extends EventObject> extends TransitionConfig<TContext, TEvents> {
     delay: number;
 }
-export declare type DelayedTransitions<TContext> = Record<string, string | TransitionConfig<TContext> | Array<TransitionConfig<TContext>>> | Array<DelayedTransitionConfig<TContext>>;
+export declare type DelayedTransitions<TContext, TEvents extends EventObject> = Record<string, string | TransitionConfig<TContext, TEvents> | Array<TransitionConfig<TContext, TEvents>>> | Array<DelayedTransitionConfig<TContext, TEvents>>;
 export declare type StateTypes = 'atomic' | 'compound' | 'parallel' | 'final' | 'history';
 export declare type SingleOrArray<T> = T[] | T;
-export interface StateNodeConfig<TContext = DefaultContext, TData = any> {
+export declare type StateNodesConfig<TContext, TStateSchema extends StateSchema, TEvents extends EventObject> = {
+    [K in keyof TStateSchema['states']]: StateNode<TContext, TStateSchema['states'][K], TEvents>;
+};
+export declare type StatesConfig<TContext, TStateSchema extends StateSchema, TEvents extends EventObject> = {
+    [K in keyof TStateSchema['states']]: StateNodeConfig<TContext, TStateSchema['states'][K], TEvents>;
+};
+export declare type StatesDefinition<TContext, TStateSchema extends StateSchema, TEvents extends EventObject> = {
+    [K in keyof TStateSchema['states']]: StateNodeDefinition<TContext, TStateSchema['states'][K], TEvents>;
+};
+export declare type TransitionsConfig<TContext, TEvents extends EventObject> = {
+    [K in TEvents['type'] | BuiltInEvent<TEvents>['type']]?: string | TransitionConfig<TContext, TEvents extends {
+        type: K;
+    } ? TEvents : EventObject> | Array<TransitionConfig<TContext, TEvents extends {
+        type: K;
+    } ? TEvents : EventObject>>;
+};
+export declare type TransitionsDefinition<TContext, TEvents extends EventObject> = {
+    [K in TEvents['type']]: Array<TransitionDefinition<TContext, TEvents extends {
+        type: K;
+    } ? TEvents : EventObject>>;
+};
+export interface StateNodeConfig<TContext, TStateSchema extends StateSchema, TEvents extends EventObject> {
     key?: string;
-    initial?: string | undefined;
+    initial?: keyof TStateSchema['states'] | undefined;
     parallel?: boolean | undefined;
@@ -89,11 +106,13 @@ type?: StateTypes;
     history?: 'shallow' | 'deep' | boolean | undefined;
-    states?: Record<string, StateNodeConfig<TContext>> | undefined;
-    on?: Record<string, Transition<TContext> | undefined>;
+    states?: StatesConfig<TContext, TStateSchema, TEvents> | undefined;
+    on?: TransitionsConfig<TContext, TEvents>;
     onEntry?: SingleOrArray<Action<TContext>>;
     onExit?: SingleOrArray<Action<TContext>>;
-    after?: DelayedTransitions<TContext>;
+    after?: DelayedTransitions<TContext, TEvents>;
     activities?: SingleOrArray<Activity<TContext>>;
     parent?: StateNode<TContext>;
     strict?: boolean | undefined;
-    data?: TData;
+    data?: TStateSchema extends {
+        data: infer D;
+    } ? D : any;
     id?: string | undefined;
@@ -103,18 +122,18 @@ delimiter?: string;
 }
-export interface StateNodeDefinition<TContext = DefaultContext, TData = any> extends StateNodeConfig<TContext> {
+export interface StateNodeDefinition<TContext, TStateSchema extends StateSchema, TEvents extends EventObject> extends StateNodeConfig<TContext, TStateSchema, TEvents> {
     id: string;
     key: string;
     type: StateTypes;
-    initial: string | undefined;
+    initial: StateNodeConfig<TContext, TStateSchema, TEvents>['initial'];
     history: boolean | 'shallow' | 'deep' | undefined;
-    states: Record<string, StateNodeDefinition<TContext>>;
-    on: Record<string, Array<TransitionDefinition<TContext>>>;
+    states: StatesDefinition<TContext, TStateSchema, TEvents>;
+    on: TransitionsDefinition<TContext, TEvents>;
     onEntry: Array<Action<TContext>>;
     onExit: Array<Action<TContext>>;
-    after: Array<DelayedTransitionDefinition<TContext>>;
+    after: Array<DelayedTransitionDefinition<TContext, TEvents>>;
     activities: Array<ActivityDefinition<TContext>>;
-    data: TData;
+    data: any;
     order: number;
 }
-export interface SimpleStateNodeConfig<TContext> extends StateNodeConfig<TContext> {
+export interface SimpleStateNodeConfig<TContext, TEvents extends EventObject> extends StateNodeConfig<TContext, never, TEvents> {
     initial?: undefined;
@@ -124,24 +143,22 @@ parallel?: false | undefined;
 }
-export interface HistoryStateNodeConfig<TContext> extends SimpleStateNodeConfig<TContext> {
+export interface HistoryStateNodeConfig<TContext, TEvents extends EventObject> extends SimpleStateNodeConfig<TContext, TEvents> {
     history: 'shallow' | 'deep' | true;
     target: StateValue | undefined;
 }
-export interface CompoundStateNodeConfig<TContext> extends StateNodeConfig<TContext> {
-    initial?: string;
+export interface CompoundStateNodeConfig<TContext, TStateSchema extends StateSchema, TEvents extends EventObject> extends StateNodeConfig<TContext, TStateSchema, TEvents> {
     parallel?: boolean;
-    states: Record<string, StateNodeConfig<TContext>>;
+    states: StateNodeConfig<TContext, TStateSchema, TEvents>['states'];
 }
-export declare type SimpleOrCompoundStateNodeConfig<TContext> = SimpleStateNodeConfig<TContext> | CompoundStateNodeConfig<TContext>;
+export declare type SimpleOrCompoundStateNodeConfig<TContext, TStateSchema extends StateSchema, TEvents extends EventObject> = SimpleStateNodeConfig<TContext, TEvents> | CompoundStateNodeConfig<TContext, TStateSchema, TEvents>;
 export declare type ActionFunctionMap<TContext> = Record<string, ActionObject<TContext> | ActionFunction<TContext>>;
-export interface MachineOptions<TContext> {
-    guards?: Record<string, ConditionPredicate<TContext>>;
+export interface MachineOptions<TContext, TEvents extends EventObject> {
+    guards?: Record<string, ConditionPredicate<TContext, TEvents>>;
     actions?: ActionFunctionMap<TContext>;
     activities?: Record<string, ActivityConfig<TContext>>;
 }
-export declare type MachineConfig<TContext> = CompoundStateNodeConfig<TContext>;
-export interface StandardMachineConfig<TContext> extends CompoundStateNodeConfig<TContext> {
+export declare type MachineConfig<TContext, TStateSchema extends StateSchema, TEvents extends EventObject> = CompoundStateNodeConfig<TContext, TStateSchema, TEvents>;
+export interface StandardMachineConfig<TContext, TStateSchema extends StateSchema, TEvents extends EventObject> extends CompoundStateNodeConfig<TContext, TStateSchema, TEvents> {
 }
-export interface ParallelMachineConfig<TContext> extends CompoundStateNodeConfig<TContext> {
-    initial?: string | undefined;
-    parallel?: true;
+export interface ParallelMachineConfig<TContext, TStateSchema extends StateSchema, TEvents extends EventObject> extends CompoundStateNodeConfig<TContext, TStateSchema, TEvents> {
+    initial?: undefined;
     type?: 'parallel';
@@ -153,12 +170,2 @@ }
 }
-export interface ComplexStateNode<TContext> extends StateNode<TContext> {
-    initial: string;
-    history: false;
-}
-export interface LeafStateNode<TContext> extends StateNode<TContext> {
-    initial: never;
-    parallel: never;
-    states: never;
-    parent: StateNode<TContext>;
-}
 export interface HistoryStateNode<TContext> extends StateNode<TContext> {
@@ -168,14 +175,6 @@ history: 'shallow' | 'deep';
 }
-export interface Machine<TContext = DefaultContext> extends StateNode<TContext> {
+export interface Machine<TContext, TStateSchema extends StateSchema, TEvents extends EventObject> extends StateNode<TContext, TStateSchema, TEvents> {
     id: string;
-    states: Record<string, StateNode<TContext>>;
+    states: StateNode<TContext, TStateSchema, TEvents>['states'];
 }
-export interface StandardMachine<TContext> extends Machine<TContext> {
-    initial: string;
-    parallel: false;
-}
-export interface ParallelMachine<TContext> extends Machine<TContext> {
-    initial: undefined;
-    parallel: true;
-}
 export interface ActionMap<TContext> {
@@ -193,3 +192,2 @@ onEntry: Array<Action<TContext>>;
 }
-export declare type MaybeStateValueActionsTuple<TContext> = [StateValue | undefined, ActionMap<TContext>, ActivityMap | undefined];
 export interface StateTransition<TContext> {
@@ -213,8 +211,19 @@ value: StateValue | undefined;
     Cancel = "xstate.cancel",
-    Null = "xstate.null",
+    Null = "",
     Assign = "xstate.assign",
     After = "xstate.after",
     DoneState = "done.state",
-    Log = "xstate.log"
+    Log = "xstate.log",
+    Init = "xstate.init"
 }
+export interface RaisedEvent<TEvents extends EventObject> {
+    type: ActionTypes.Raise;
+    event: TEvents;
+}
+export declare type BuiltInEvent<TEvents extends EventObject> = {
+    type: ActionTypes.Null;
+} | RaisedEvent<TEvents> | {
+    type: ActionTypes.Init;
+};
+export declare type AnyEvent<TEvents extends EventObject> = TEvents | BuiltInEvent<TEvents>;
 export interface ActivityActionObject<TContext> extends ActionObject<TContext> {
@@ -225,4 +234,4 @@ type: ActionTypes.Start | ActionTypes.Stop;
 }
-export interface SendAction extends ActionObject<any> {
-    event: EventObject;
+export interface SendAction<TContext, TEvents extends EventObject> extends ActionObject<TContext> {
+    event: TEvents;
     delay?: number;
@@ -238,10 +247,10 @@ id: string | number;
 }
-export declare type Assigner<TContext> = (extState: TContext, event: EventObject) => Partial<TContext>;
-export declare type PropertyAssigner<TContext> = Partial<{
-    [K in keyof TContext]: ((extState: TContext, event: EventObject) => TContext[K]) | TContext[K];
+export declare type Assigner<TContext, TEvents extends EventObject> = (extState: TContext, event: TEvents) => Partial<TContext>;
+export declare type PropertyAssigner<TContext, TEvents extends EventObject> = Partial<{
+    [K in keyof TContext]: ((extState: TContext, event: TEvents) => TContext[K]) | TContext[K];
 }>;
-export interface AssignAction<TContext> extends ActionObject<TContext> {
-    assignment: Assigner<TContext> | PropertyAssigner<TContext>;
+export interface AssignAction<TContext, TEvents extends EventObject> extends ActionObject<TContext> {
+    assignment: Assigner<TContext, TEvents> | PropertyAssigner<TContext, TEvents>;
 }
-export interface TransitionDefinition<TContext> extends TransitionConfig<TContext> {
+export interface TransitionDefinition<TContext, TEvents extends EventObject> extends TransitionConfig<TContext, TEvents> {
     actions: Array<Action<TContext>>;
@@ -251,19 +260,21 @@ event: string;
 }
-export interface DelayedTransitionDefinition<TContext> extends TransitionDefinition<TContext> {
+export interface DelayedTransitionDefinition<TContext, TEvents extends EventObject> extends TransitionDefinition<TContext, TEvents> {
     delay: number;
 }
-export interface Edge<TContext> {
-    event: string;
+export interface Edge<TContext, TEvents extends EventObject, TEventType extends TEvents['type'] = string> {
+    event: TEventType;
     source: StateNode<TContext>;
     target: StateNode<TContext>;
-    cond?: Condition<TContext>;
+    cond?: Condition<TContext, TEvents & {
+        type: TEventType;
+    }>;
     actions: Array<Action<TContext>>;
     meta?: MetaObject;
-    transition: TransitionDefinition<TContext>;
+    transition: TransitionDefinition<TContext, TEvents>;
 }
-export interface NodesAndEdges<TContext> {
+export interface NodesAndEdges<TContext, TEvents extends EventObject> {
     nodes: StateNode[];
-    edges: Array<Edge<TContext>>;
+    edges: Array<Edge<TContext, TEvents, TEvents['type']>>;
 }
-export interface Segment<TContext = DefaultContext> {
+export interface Segment<TContext = DefaultContext, TEvents extends EventObject = EventObject> {
     /**
@@ -278,3 +289,3 @@ * From state
      */
-    event: Event;
+    event: Event<TEvents>;
 }
@@ -308,3 +319,3 @@ export interface PathMap {
 }
-export interface StateInterface<TContext = DefaultContext, TData = DefaultData> {
+export interface StateInterface<TContext = DefaultContext, TEvents extends EventObject = EventObject> {
     value: StateValue;
@@ -314,6 +325,12 @@ history?: State<TContext>;
     activities: ActivityMap;
-    data: TData;
-    events: EventObject[];
+    data: any;
+    events: TEvents[];
     context: TContext;
     toStrings: () => string[];
 }
+export interface StateSchema {
+    data?: any;
+    states?: {
+        [key: string]: StateSchema;
+    };
+}

lib/types.js

@@ -10,3 +10,3 @@ "use strict";
     ActionTypes["Cancel"] = "xstate.cancel";
-    ActionTypes["Null"] = "xstate.null";
+    ActionTypes["Null"] = "";
     ActionTypes["Assign"] = "xstate.assign";
@@ -16,2 +16,3 @@ ActionTypes["After"] = "xstate.after";
     ActionTypes["Log"] = "xstate.log";
+    ActionTypes["Init"] = "xstate.init";
 })(ActionTypes = exports.ActionTypes || (exports.ActionTypes = {}));

lib/utils.d.ts

 import { State } from './State';
-import { Event, StateValue, EventType, ActionType, Action } from './types';
-export declare function getEventType(event: Event): EventType;
+import { Event, StateValue, ActionType, Action, EventObject } from './types';
+export declare function getEventType<TEvents extends EventObject = EventObject>(event: Event<TEvents>): TEvents['type'];
 export declare function getActionType(action: Action<any>): ActionType;
@@ -5,0 +5,0 @@ export declare function toStatePath(stateId: string | string[], delimiter: string): string[];

package.json

 {
   "name": "xstate",
-  "version": "4.0.0-7",
+  "version": "4.0.0-8",
   "description": "Simple JavaScript Finite State Machines and Statecharts",
@@ -61,3 +61,3 @@ "main": "lib/index.js",
     "tslint": "^5.11.0",
-    "typescript": "^3.0.1",
+    "typescript": "^3.0.3",
     "xml-js": "^1.6.7"
@@ -64,0 +64,0 @@ },

README.md

@@ -6,2 +6,3 @@ # xstate
 [![Statecharts gitter chat](https://badges.gitter.im/gitterHQ/gitter.png)](https://gitter.im/statecharts/statecharts)
+<img src="https://opencollective.com/xstate/tiers/backer/badge.svg?label=sponsors&color=brightgreen" />
 
@@ -337,3 +338,9 @@ Functional, stateless JavaScript [finite state machines](https://en.wikipedia.org/wiki/Finite-state_machine) and [statecharts](http://www.inf.ed.ac.uk/teaching/courses/seoc/2005_2006/resources/statecharts.pdf).
 
+## Sponsors
+
+Huge thanks to the following companies for sponsoring `xstate`. You can sponsor further `xstate` development [on OpenCollective](https://opencollective.com/xstate).
+
+<a href="https://tipe.io" title="Tipe.io"><img src="https://cdn.tipe.io/tipe/tipe-logo.svg?w=240" style="background:#613DEF" /></a>
+
 ## Interpreters
 - [`xstateful` by @avaragado](https://www.npmjs.com/package/@avaragado/xstateful)

src/actions.ts

 import {
   Action,
   Event,
-  EventType,
   EventObject,
@@ -25,17 +24,17 @@ SendAction,
 
-export const toEventObject = (
-  event: Event,
-  id?: string | number
-): EventObject => {
+export function toEventObject<TEvents extends EventObject>(
+  event: Event<TEvents>
+  // id?: TEvents['type']
+): TEvents {
   if (typeof event === 'string' || typeof event === 'number') {
-    const eventObject: EventObject = { type: event };
-    if (id !== undefined) {
-      eventObject.id = id;
-    }
+    const eventObject = { type: event };
+    // if (id !== undefined) {
+    //   eventObject.id = id;
+    // }
 
-    return eventObject;
+    return eventObject as TEvents;
   }
 
-  return event;
-};
+  return event as TEvents;
+}
 
@@ -126,18 +125,33 @@ function getActionFunction<TContext>(
 
-export const raise = (eventType: EventType): EventObject => ({
-  type: actionTypes.raise,
-  event: eventType
-});
+interface RaiseEvent<TContext, TEvents extends EventObject>
+  extends ActionObject<TContext> {
+  event: TEvents['type'];
+}
 
-export const send = (event: Event, options?: SendActionOptions): SendAction => {
+export function raise<TContext, TEvents extends EventObject>(
+  eventType: TEvents['type']
+): RaiseEvent<TContext, TEvents> {
   return {
+    type: actionTypes.raise,
+    event: eventType
+  };
+}
+
+export function send<TContext, TEvents extends EventObject>(
+  event: Event<TEvents>,
+  options?: SendActionOptions
+): SendAction<TContext, TEvents> {
+  return {
     type: actionTypes.send,
-    event: toEventObject(event),
+    event: toEventObject<TEvents>(event),
     delay: options ? options.delay : undefined,
-    id: options && options.id !== undefined ? options.id : getEventType(event)
+    id:
+      options && options.id !== undefined
+        ? options.id
+        : (getEventType<TEvents>(event) as string)
   };
-};
+}
 
-export function log<TContext>(
-  expr: (ctx: TContext, event: EventObject) => void,
+export function log<TContext, TEvents extends EventObject>(
+  expr: (ctx: TContext, event: TEvents) => void,
   label?: string
@@ -183,5 +197,5 @@ ) {
 
-export const assign = <TContext>(
-  assignment: Assigner<TContext> | PropertyAssigner<TContext>
-): AssignAction<TContext> => {
+export const assign = <TContext, TEvents extends EventObject = EventObject>(
+  assignment: Assigner<TContext, TEvents> | PropertyAssigner<TContext, TEvents>
+): AssignAction<TContext, TEvents> => {
   return {
@@ -188,0 +202,0 @@ type: actionTypes.assign,

src/actionTypes.ts

@@ -15,1 +15,2 @@ import { ActionTypes } from './types';
 export const log = ActionTypes.Log;
+export const init = ActionTypes.Init;

src/graph.ts

@@ -14,3 +14,4 @@ import { StateNode, State } from './index';
   ValueAdjacencyMap,
-  Event
+  Event,
+  EventObject
 } from './types';
@@ -36,6 +37,6 @@
 
-export function getEventEdges<TContext = DefaultContext>(
-  node: StateNode<TContext>,
-  event: string
-): Array<Edge<TContext>> {
+export function getEventEdges<
+  TContext = DefaultContext,
+  TEvents extends EventObject = EventObject
+>(node: StateNode<TContext>, event: string): Array<Edge<TContext, TEvents>> {
   const transitions = node.definition.on[event];
@@ -65,3 +66,3 @@
       return targets
-        .map<Edge<TContext> | undefined>(target => {
+        .map<Edge<TContext, TEvents> | undefined>(target => {
           try {
@@ -88,3 +89,5 @@ const targetNode = target
         })
-        .filter(maybeEdge => maybeEdge !== undefined) as Array<Edge<TContext>>;
+        .filter(maybeEdge => maybeEdge !== undefined) as Array<
+        Edge<TContext, TEvents>
+      >;
     })
@@ -94,8 +97,11 @@ );
 
-export function getEdges<TContext = DefaultContext>(
+export function getEdges<
+  TContext = DefaultContext,
+  TEvents extends EventObject = EventObject
+>(
   node: StateNode<TContext>,
   options?: { depth: null | number }
-): Array<Edge<TContext>> {
+): Array<Edge<TContext, TEvents>> {
   const { depth = null } = options || {};
-  const edges: Array<Edge<TContext>> = [];
+  const edges: Array<Edge<TContext, TEvents>> = [];
 
@@ -140,3 +146,3 @@ if (node.states && depth === null) {
       const nextState = node.transition(stateValue, event, context);
-      adjacency[stateKey][event] = { state: nextState.value };
+      adjacency[stateKey][event as string] = { state: nextState.value };
 
@@ -152,3 +158,5 @@ findAdjacencies(nextState.value);
 
-function eventToString(event: Event): string {
+function eventToString<TEvents extends EventObject = EventObject>(
+  event: Event<TEvents>
+): string {
   if (typeof event === 'string' || typeof event === 'number') {
@@ -158,2 +166,3 @@ return `${event}`;
 
+  // @ts-ignore - TODO: fix?
   const { type, ...rest } = event;
@@ -180,10 +189,17 @@
 
-export interface GetValueAdjacencyMapOptions<TContext> {
-  events: Record<string, Event[]>;
+export interface GetValueAdjacencyMapOptions<
+  TContext,
+  TEvents extends EventObject
+> {
+  // events: Record<string, Array<Event<TEvents>>>;
+  events: { [K in TEvents['type']]: Event<TEvents> };
   filter?: (state: State<TContext>) => boolean;
 }
 
-export function getValueAdjacencyMap<TContext = DefaultContext>(
-  node: StateNode<TContext>,
-  options: GetValueAdjacencyMapOptions<TContext>
+export function getValueAdjacencyMap<
+  TContext = DefaultContext,
+  TEvents extends EventObject = EventObject
+>(
+  node: StateNode<TContext, any, TEvents>,
+  options: GetValueAdjacencyMapOptions<TContext, TEvents>
 ): ValueAdjacencyMap {
@@ -194,6 +210,7 @@ const { events, filter } = options;
   const potentialEvents = flatten(
+    // @ts-ignore
     node.events.map(event => events[event] || [event])
   );
 
-  function findAdjacencies(state: State<TContext>) {
+  function findAdjacencies(state: State<TContext, TEvents>) {
     const stateKey = serializeState(state);
@@ -226,5 +243,8 @@
 
-export function getShortestValuePaths<TContext = DefaultContext>(
+export function getShortestValuePaths<
+  TContext = DefaultContext,
+  TEvents extends EventObject = EventObject
+>(
   machine: StateNode<TContext>,
-  options: GetValueAdjacencyMapOptions<TContext>
+  options: GetValueAdjacencyMapOptions<TContext, TEvents>
 ): PathMap {
@@ -231,0 +251,0 @@ if (!machine.states) {

src/interpreter.ts

@@ -8,3 +8,4 @@ import {
   DefaultContext,
-  ActionObject
+  ActionObject,
+  StateSchema
 } from './types';
@@ -88,3 +89,8 @@ import { State } from './State';
 // tslint:disable-next-line:max-classes-per-file
-export class Interpreter<TContext> {
+export class Interpreter<
+  TContext,
+  TStateSchema extends StateSchema = any,
+  TEvents extends EventObject = EventObject
+> {
+  // TODO: fixme
   public static defaultOptions: InterpreterOptions = {
@@ -94,5 +100,5 @@ clock: { setTimeout, clearTimeout },
   };
-  public state: State<TContext>;
+  public state: State<TContext, TEvents>;
   public extState: TContext;
-  public eventQueue: EventObject[] = [];
+  public eventQueue: TEvents[] = [];
   public delayedEventsMap: Record<string, number> = {};
@@ -105,3 +111,3 @@ public listeners: Set<StateListener> = new Set();
   constructor(
-    public machine: Machine<TContext>,
+    public machine: Machine<TContext, TStateSchema, TEvents>,
     listener?: StateListener,
@@ -123,3 +129,6 @@ options: Partial<InterpreterOptions> = Interpreter.defaultOptions
   public static interpret = interpret;
-  private update(state: State<TContext>, event?: Event): void {
+  private update(
+    state: State<TContext, TEvents>,
+    event?: Event<TEvents>
+  ): void {
     this.state = state;
@@ -156,3 +165,6 @@ const { context } = this.state;
   public start(
-    initialState: State<TContext> = this.machine.initialState
+    initialState: State<TContext, TEvents> = this.machine.initialState as State<
+      TContext,
+      TEvents
+    >
   ): Interpreter<TContext> {
@@ -172,3 +184,3 @@ this.update(initialState);
   }
-  public send = (event: Event): State<TContext> => {
+  public send = (event: Event<TEvents>): State<TContext, TEvents> => {
     const eventObject = toEventObject(event);
@@ -186,3 +198,3 @@ if (!this.initialized) {
       this.extState
-    );
+    ) as State<TContext, TEvents>; // TODO: fixme
 
@@ -194,3 +206,3 @@ this.update(nextState, event);
   };
-  private defer(sendAction: SendAction): number {
+  private defer(sendAction: SendAction<TContext, TEvents>): number {
     return this.clock.setTimeout(
@@ -208,3 +220,3 @@ () => this.send(sendAction.event),
     context: TContext,
-    event?: EventObject
+    event?: TEvents
   ): Partial<TContext> | undefined {
@@ -217,3 +229,3 @@ if (action.exec) {
       case actionTypes.send:
-        const sendAction = action as SendAction;
+        const sendAction = action as SendAction<TContext, TEvents>;
 
@@ -251,4 +263,5 @@ if (!sendAction.delay) {
   private flushEventQueue() {
-    if (this.eventQueue.length) {
-      this.send(this.eventQueue.unshift());
+    const flushedEvent = this.eventQueue.shift();
+    if (flushedEvent) {
+      this.send(flushedEvent);
     }
@@ -258,4 +271,8 @@ }
 
-export function interpret<TContext = DefaultContext>(
-  machine: Machine<TContext>,
+export function interpret<
+  TContext = DefaultContext,
+  TStateSchema extends StateSchema = any,
+  TEvents extends EventObject = EventObject
+>(
+  machine: Machine<TContext, TStateSchema, TEvents>,
   listener?: StateListener,
@@ -262,0 +279,0 @@ options?: Partial<InterpreterOptions>

src/Machine.ts

@@ -5,14 +5,22 @@ import {
   DefaultContext,
-  MachineConfig
+  MachineConfig,
+  StateSchema,
+  EventObject
 } from './types';
 import { StateNode } from './StateNode';
 
-export function Machine<TContext = DefaultContext>(
-  config: MachineConfig<TContext>,
-  options?: MachineOptions<TContext>,
+export function Machine<
+  TContext = DefaultContext,
+  TStateSchema extends StateSchema = any,
+  TEvents extends EventObject = EventObject
+>(
+  config: MachineConfig<TContext, TStateSchema, TEvents>,
+  options?: MachineOptions<TContext, TEvents>,
   initialContext?: TContext
-): Machine<TContext> {
-  return new StateNode<TContext>(config, options, initialContext) as Machine<
-    TContext
-  >;
+): Machine<TContext, TStateSchema, TEvents> {
+  return new StateNode<TContext, TStateSchema, TEvents>(
+    config,
+    options,
+    initialContext
+  ) as Machine<TContext, TStateSchema, TEvents>;
 }

src/patterns.ts

 import { SimpleStateNodeConfig } from './types';
 
-export function toggle(
+export function toggle<TEventType extends string = string>(
   onState: string,
   offState: string,
-  eventType: string
-): Record<string, SimpleStateNodeConfig<any>> {
+  eventType: TEventType
+): Record<string, SimpleStateNodeConfig<any, { type: TEventType }>> {
   return {
@@ -15,3 +15,3 @@ [onState]: {
     }
-  };
+  } as Record<string, SimpleStateNodeConfig<any, { type: TEventType }>>;
 }

src/scxml.ts

@@ -34,3 +34,3 @@ import { js2xml, xml2js, Element as XMLElement } from 'xml-js';
                 attributes: {
-                  target: stateNode.states[stateNode.initial].id
+                  target: stateNode.states[stateNode.initial as string].id
                 }
@@ -218,3 +218,3 @@ }
       case 'raise':
-        return actions.raise(element.attributes!.event!);
+        return actions.raise(element.attributes!.event! as string);
       case 'assign':
@@ -247,3 +247,3 @@ return actions.assign(xs => {
           : 0;
-        return actions.send(element.attributes!.event!, {
+        return actions.send(element.attributes!.event! as string, {
           delay: numberDelay
@@ -408,4 +408,2 @@ });
 
-  // console.log(dataModelEl, extState);
-
   return Machine(
@@ -412,0 +410,0 @@ {

src/State.ts

@@ -13,10 +13,11 @@ import {
 
-export class State<TContext> implements StateInterface<TContext> {
-  public static from<T>(
-    stateValue: State<T> | StateValue,
-    context: T
-  ): State<T> {
+export class State<TContext, TEvents extends EventObject = EventObject>
+  implements StateInterface<TContext> {
+  public static from<TC, TE extends EventObject = EventObject>(
+    stateValue: State<TC, TE> | StateValue,
+    context: TC
+  ): State<TC, TE> {
     if (stateValue instanceof State) {
       if (stateValue.context !== context) {
-        return new State<T>(
+        return new State<TC, TE>(
           stateValue.value,
@@ -36,3 +37,3 @@ context,
 
-    return new State(
+    return new State<TC, TE>(
       stateValue,
@@ -48,6 +49,9 @@ context,
   }
-  public static inert<T>(stateValue: State<T> | StateValue, ext: T): State<T> {
+  public static inert<TC, TE extends EventObject = EventObject>(
+    stateValue: State<TC> | StateValue,
+    ext: TC
+  ): State<TC, TE> {
     if (stateValue instanceof State) {
       if (!stateValue.actions.length) {
-        return stateValue;
+        return stateValue as State<TC, TE>;
       }
@@ -66,3 +70,3 @@ return new State(
 
-    return State.from(stateValue, ext);
+    return State.from<TC, TE>(stateValue, ext);
   }
@@ -81,3 +85,3 @@
      */
-    public events: EventObject[] = []
+    public events: TEvents[] = []
   ) {}
@@ -100,5 +104,5 @@
 
-  public get changed(): boolean {
+  public get changed(): boolean | undefined {
     if (!this.history) {
-      return false;
+      return undefined;
     }
@@ -108,3 +112,3 @@
       !!this.actions.length ||
-      (typeof this.history.value !== this.value
+      (typeof this.history.value !== typeof this.value
         ? true
@@ -111,0 +115,0 @@ : typeof this.value === 'string'

src/StateNode.ts

@@ -19,3 +19,2 @@ import {
   Action,
-  EventType,
   TransitionConfig,
@@ -33,3 +32,2 @@ ActivityMap,
   HistoryValue,
-  DefaultData,
   DefaultContext,
@@ -45,3 +43,10 @@ StateNodeDefinition,
   Activity,
-  StateNodeValueTree
+  StateNodeValueTree,
+  StateSchema,
+  TransitionsDefinition,
+  StatesDefinition,
+  StateNodesConfig,
+  ActionTypes,
+  AnyEvent,
+  RaisedEvent
 } from './types';
@@ -74,7 +79,11 @@ import { matchesState } from './matchesState';
 const isStateId = (str: string) => str[0] === STATE_IDENTIFIER;
-const createDefaultOptions = <TContext>(): MachineOptions<TContext> => ({
+const createDefaultOptions = <TContext>(): MachineOptions<TContext, any> => ({
   guards: EMPTY_OBJECT
 });
 
-class StateNode<TContext = DefaultContext, TData = DefaultData> {
+class StateNode<
+  TContext = DefaultContext,
+  TStateSchema extends StateSchema = any,
+  TEvents extends AnyEvent<EventObject> = AnyEvent<EventObject>
+> {
   public key: string;
@@ -84,6 +93,6 @@ public id: string;
   public path: string[];
-  public initial?: string;
+  public initial?: keyof TStateSchema['states'];
   public parallel: boolean;
   public transient: boolean;
-  public states: Record<string, StateNode<TContext>>;
+  public states: StateNodesConfig<TContext, TStateSchema, TEvents>;
   public history: false | 'shallow' | 'deep';
@@ -96,3 +105,3 @@ public onEntry: Array<Action<TContext>>;
   public machine: StateNode<TContext>;
-  public data: TData;
+  public data?: TStateSchema extends { data: infer D } ? D : any;
   public delimiter: string;
@@ -102,3 +111,3 @@ public order: number;
   private __cache = {
-    events: undefined as EventType[] | undefined,
+    events: undefined as Array<TEvents['type']> | undefined,
     relativeValue: new Map() as Map<StateNode<TContext>, StateValue>,
@@ -111,6 +120,6 @@ initialState: undefined as StateValue | undefined
   constructor(
-    private _config: StateNodeConfig<TContext>,
-    public options: Readonly<MachineOptions<TContext>> = createDefaultOptions<
-      TContext
-    >(),
+    private _config: StateNodeConfig<TContext, TStateSchema, TEvents>,
+    public options: Readonly<
+      MachineOptions<TContext, TEvents>
+    > = createDefaultOptions<TContext>(),
     /**
@@ -146,5 +155,5 @@ * The initial extended state
     this.states = (_config.states
-      ? mapValues<StateNodeConfig<TContext>, StateNode<TContext>>(
+      ? mapValues(
           _config.states,
-          (stateConfig, key, _, i) => {
+          (stateConfig: StateNodeConfig<TContext, any, TEvents>, key, _, i) => {
             const stateNode = new StateNode({
@@ -163,3 +172,3 @@ ...stateConfig,
         )
-      : EMPTY_OBJECT) as Record<string, StateNode<TContext>>;
+      : EMPTY_OBJECT) as StateNodesConfig<TContext, TStateSchema, TEvents>;
 
@@ -180,3 +189,7 @@ // History config
   }
-  public get definition(): StateNodeDefinition<TContext, TData> {
+  public get definition(): StateNodeDefinition<
+    TContext,
+    TStateSchema,
+    TEvents
+  > {
     return {
@@ -188,3 +201,6 @@ id: this.id,
       history: this.history,
-      states: mapValues(this.states, state => state.definition),
+      states: mapValues(
+        this.states,
+        (state: StateNode<TContext, any, TEvents>) => state.definition
+      ) as StatesDefinition<TContext, TStateSchema, TEvents>,
       on: this.on,
@@ -199,3 +215,3 @@ onEntry: this.onEntry,
   }
-  public get config(): StateNodeConfig<TContext> {
+  public get config(): StateNodeConfig<TContext, TStateSchema, TEvents> {
     const { parent, ...config } = this._config;
@@ -205,6 +221,6 @@
   }
-  public get on(): Record<string, Array<TransitionDefinition<TContext>>> {
+  public get on(): TransitionsDefinition<TContext, TEvents> {
     return this.formatTransitions();
   }
-  public get after(): Array<DelayedTransitionDefinition<TContext>> {
+  public get after(): Array<DelayedTransitionDefinition<TContext, TEvents>> {
     const {
@@ -230,3 +246,4 @@ config: { after: afterConfig }
           number | string,
-          TransitionConfig<TContext> | Array<TransitionConfig<TContext>>
+          | TransitionConfig<TContext, TEvents>
+          | Array<TransitionConfig<TContext, TEvents>>
         >)[delayKey];
@@ -256,3 +273,3 @@ const delay = +delayKey;
   public getStateNodes(
-    state: StateValue | State<TContext>
+    state: StateValue | State<TContext, TEvents>
   ): Array<StateNode<TContext>> {
@@ -271,3 +288,3 @@ if (!state) {
       return initialStateValue
-        ? this.getStateNodes({ [stateValue]: initialStateValue })
+        ? this.getStateNodes({ [stateValue]: initialStateValue } as StateValue)
         : [this.states[stateValue]];
@@ -294,4 +311,4 @@ }
   }
-  public handles(event: Event): boolean {
-    const eventType = getEventType(event);
+  public handles(event: Event<TEvents>): boolean {
+    const eventType = getEventType<TEvents>(event);
 
@@ -302,4 +319,4 @@ return this.events.indexOf(eventType) !== -1;
     stateValue: string,
-    state: State<TContext>,
-    eventObject: EventObject,
+    state: State<TContext, TEvents>,
+    eventObject: TEvents,
     context?: TContext
@@ -338,4 +355,4 @@ ): StateTransition<TContext> {
     stateValue: StateValueMap,
-    state: State<TContext>,
-    eventObject: EventObject,
+    state: State<TContext, TEvents>,
+    eventObject: TEvents,
     context?: TContext
@@ -384,4 +401,4 @@ ): StateTransition<TContext> {
     stateValue: StateValueMap,
-    state: State<TContext>,
-    eventObject: EventObject,
+    state: State<TContext, TEvents>,
+    eventObject: TEvents,
     context?: TContext
@@ -534,4 +551,4 @@ ): StateTransition<TContext> {
     stateValue: StateValue,
-    state: State<TContext>,
-    event: EventObject,
+    state: State<TContext, TEvents>,
+    event: TEvents,
     context?: TContext
@@ -553,4 +570,4 @@ ): StateTransition<TContext> {
   private next(
-    state: State<TContext>,
-    eventObject: EventObject,
+    state: State<TContext, TEvents>,
+    eventObject: TEvents,
     context?: TContext
@@ -575,3 +592,3 @@ ): StateTransition<TContext> {
     let nextStateStrings: string[] = [];
-    let selectedTransition: TransitionConfig<TContext>;
+    let selectedTransition: unknown;
 
@@ -583,3 +600,3 @@ for (const candidate of candidates) {
         // actions: transitionActions
-      } = candidate as TransitionConfig<TContext>;
+      } = candidate as TransitionConfig<TContext, TEvents>;
       const resolvedContext = context || (EMPTY_OBJECT as TContext);
@@ -639,3 +656,4 @@
           nextStateNode,
-          !!selectedTransition.internal
+          !!(selectedTransition as TransitionDefinition<TContext, TEvents>)
+            .internal
         );
@@ -748,8 +766,8 @@
   private evaluateCond(
-    condition: Condition<TContext>,
+    condition: Condition<TContext, TEvents>,
     context: TContext,
-    eventObject: EventObject,
+    eventObject: TEvents,
     interimState: StateValue
   ): boolean {
-    let condFn: ConditionPredicate<TContext>;
+    let condFn: ConditionPredicate<TContext, TEvents>;
     const { guards } = this.machine.options;
@@ -907,6 +925,6 @@
   public transition(
-    state: StateValue | State<TContext>,
-    event: Event,
+    state: StateValue | State<TContext, TEvents>,
+    event: Event<TEvents>,
     context?: TContext
-  ): State<TContext> {
+  ): State<TContext, TEvents> {
     const resolvedStateValue =
@@ -932,3 +950,3 @@ typeof state === 'string'
 
-    const currentState = State.from<TContext>(
+    const currentState = State.from<TContext, TEvents>(
       resolvedStateValue,
@@ -949,5 +967,5 @@ resolvedContext
     stateTransition: StateTransition<TContext>,
-    currentState: State<TContext>,
-    event?: EventObject
-  ): State<TContext> {
+    currentState: State<TContext, TEvents>,
+    event?: TEvents
+  ): State<TContext, TEvents> {
     const historyValue = currentState.historyValue
@@ -959,10 +977,12 @@ ? currentState.historyValue
 
-    try {
-      this.ensureValidPaths(stateTransition.paths);
-    } catch (e) {
-      throw new Error(
-        `Event '${
-          event ? event.type : 'none'
-        }' leads to an invalid configuration: ${e.message}`
-      );
+    if (process.env.NODE_ENV !== 'production') {
+      try {
+        this.ensureValidPaths(stateTransition.paths);
+      } catch (e) {
+        throw new Error(
+          `Event '${
+            event ? event.type : 'none'
+          }' leads to an invalid configuration: ${e.message}`
+        );
+      }
     }
@@ -980,3 +1000,3 @@
         (action.type === actionTypes.raise || action.type === actionTypes.null)
-    ) as Array<ActionObject<TContext>>;
+    ) as Array<RaisedEvent<TEvents> | { type: ActionTypes.Null }>;
 
@@ -992,3 +1012,3 @@ const nonEventActions = actions.filter(
       action => typeof action === 'object' && action.type === actionTypes.assign
-    ) as Array<AssignAction<TContext>>;
+    ) as Array<AssignAction<TContext, TEvents>>;
 
@@ -1002,3 +1022,6 @@ const updatedContext = currentState.context
           if (typeof assignment === 'function') {
-            partialUpdate = assignment(acc, event || { type: 'xstate.init' });
+            partialUpdate = assignment(
+              acc,
+              event || ({ type: ActionTypes.Init } as TEvents)
+            );
           } else {
@@ -1036,3 +1059,3 @@ Object.keys(assignment).forEach(key => {
     const nextState = stateTransition.value
-      ? new State<TContext>(
+      ? new State<TContext, TEvents>(
           stateTransition.value,
@@ -1047,3 +1070,3 @@ updatedContext,
           data,
-          raisedEvents
+          raisedEvents as TEvents[]
         )
@@ -1054,7 +1077,9 @@ : undefined;
       // Unchanged state should be returned with no actions
-      return State.inert<TContext>(currentState, updatedContext);
+      return State.inert<TContext, TEvents>(currentState, updatedContext);
     }
 
-    // Dispose of previous histories to prevent memory leaks
-    delete currentState.history;
+    // Dispose of penultimate histories to prevent memory leaks
+    if (currentState.history) {
+      delete currentState.history.history;
+    }
 
@@ -1067,3 +1092,5 @@ let maybeNextState = nextState;
         maybeNextState,
-        raisedEvent.type === actionTypes.null ? NULL_EVENT : raisedEvent.event,
+        raisedEvent.type === actionTypes.null
+          ? NULL_EVENT
+          : (raisedEvent as RaisedEvent<TEvents>).event,
         maybeNextState.context
@@ -1198,3 +1225,3 @@ );
       return {
-        [key]: mapFilterValues(
+        [key]: mapFilterValues<StateNode<TContext>, StateValue>(
           this.states,
@@ -1213,2 +1240,3 @@ stateNode => stateNode.resolvedStateValue[stateNode.key],
     return {
+      // @ts-ignore TODO: fixme
       [key]: this.states[this.initial].resolvedStateValue
@@ -1254,3 +1282,3 @@ };
     context: TContext = this.machine.context!
-  ): State<TContext> {
+  ): State<TContext, TEvents> {
     const activityMap: ActivityMap = {};
@@ -1265,3 +1293,3 @@ const actions: Array<Action<TContext>> = [];
         stateNode.activities.forEach(activity => {
-          activityMap[getEventType(activity)] = true;
+          activityMap[getEventType(activity) as string] = true; // TODO: fixme
           actions.push(start(activity));
@@ -1281,3 +1309,3 @@ });
       action => typeof action === 'object' && action.type === actionTypes.assign
-    ) as Array<AssignAction<TContext>>;
+    ) as Array<AssignAction<TContext, TEvents>>;
 
@@ -1291,3 +1319,3 @@ const updatedContext = context
           if (typeof assignment === 'function') {
-            partialUpdate = assignment(acc, { type: 'init' });
+            partialUpdate = assignment(acc, { type: 'init' } as TEvents); // TODO: fix init
           } else {
@@ -1299,3 +1327,3 @@ Object.keys(assignment).forEach(key => {
                 typeof propAssignment === 'function'
-                  ? propAssignment(acc, { type: 'init' })
+                  ? propAssignment(acc, { type: 'init' }) // TODO: fix init
                   : propAssignment;
@@ -1309,3 +1337,3 @@ });
 
-    const initialNextState = new State<TContext>(
+    const initialNextState = new State<TContext, TEvents>(
       stateValue,
@@ -1332,3 +1360,3 @@ updatedContext,
   }
-  public get initialState(): State<TContext> {
+  public get initialState(): State<TContext, TEvents> {
     const { initialStateValue } = this;
@@ -1360,3 +1388,6 @@
     if (this.history) {
-      const historyConfig = this.config as HistoryStateNodeConfig<TContext>;
+      const historyConfig = this.config as HistoryStateNodeConfig<
+        TContext,
+        TEvents
+      >;
       if (historyConfig.target && typeof historyConfig.target === 'string') {
@@ -1516,3 +1547,3 @@ target = isStateId(historyConfig.target)
       current: relativeStateValue || this.initialStateValue,
-      states: mapFilterValues(
+      states: mapFilterValues<StateNode<TContext>, HistoryValue | undefined>(
         this.states,
@@ -1581,3 +1612,3 @@ (stateNode, key) => {
       Object.keys(this.states).map(stateKey => {
-        return this.states[stateKey].stateIds;
+        return (this.states[stateKey] as StateNode<TContext>).stateIds;
       })
@@ -1587,3 +1618,3 @@ );
   }
-  public get events(): EventType[] {
+  public get events(): Array<TEvents['type']> {
     if (this.__cache.events) {
@@ -1610,5 +1641,5 @@ return this.__cache.events;
     target: string | string[] | undefined,
-    transitionConfig: TransitionConfig<TContext> | undefined,
+    transitionConfig: TransitionConfig<TContext, TEvents> | undefined,
     event: string
-  ): TransitionDefinition<TContext> {
+  ): TransitionDefinition<TContext, TEvents> {
     let internal = transitionConfig ? transitionConfig.internal : false;
@@ -1657,12 +1688,9 @@
   }
-  private formatTransitions(): Record<
-    string,
-    Array<TransitionDefinition<TContext>>
-  > {
+  private formatTransitions(): TransitionsDefinition<TContext, TEvents> {
     const onConfig = this.config.on || EMPTY_OBJECT;
     const delayedTransitions = this.after;
 
-    const formattedTransitions: Record<
-      string,
-      Array<TransitionDefinition<TContext>>
+    const formattedTransitions: TransitionsDefinition<
+      TContext,
+      TEvents
     > = mapValues(onConfig, (value, event) => {
@@ -1703,3 +1731,3 @@ if (value === undefined) {
         this.formatTransition(
-          (value as TransitionConfig<TContext>).target,
+          (value as TransitionConfig<TContext, TEvents>).target,
           value,
@@ -1709,3 +1737,3 @@ event
       ];
-    });
+    }) as TransitionsDefinition<TContext, TEvents>;
 
@@ -1715,3 +1743,8 @@ delayedTransitions.forEach(delayedTransition => {
         formattedTransitions[delayedTransition.event] || [];
-      formattedTransitions[delayedTransition.event].push(delayedTransition);
+      formattedTransitions[delayedTransition.event].push(
+        delayedTransition as TransitionDefinition<
+          TContext,
+          TEvents | EventObject
+        >
+      );
     });
@@ -1718,0 +1751,0 @@

src/types.ts

@@ -5,12 +5,12 @@ import { StateNode } from './StateNode';
 export type EventType = string | number;
-export type ActionType = string | number;
+export type ActionType = string;
 export type MetaObject = Record<string, any>;
 
-export interface EventObject {
-  type: EventType;
+export interface EventObject extends Record<string, any> {
+  type: string | number;
   id?: string | number;
-  [key: string]: any;
 }
+
 export interface ActionObject<TContext> extends Record<string, any> {
-  type: ActionType;
+  type: string;
   exec?: ActionFunction<TContext>;
@@ -20,6 +20,5 @@ }
 export type DefaultContext = Record<string, any> | undefined;
-export type DefaultData = Record<string, any>;
 
-export type Event = EventType | EventObject;
-export type InternalEvent = EventType | EventObject;
+export type Event<TEvents extends EventObject> = TEvents['type'] | TEvents;
+
 export interface ActionFunction<TContext> {
@@ -29,7 +28,6 @@ (context: TContext, event?: EventObject): any | void;
 }
-export type InternalAction<TContext> = SendAction | AssignAction<TContext>;
+// export type InternalAction<TContext> = SendAction | AssignAction<TContext>;
 export type Action<TContext> =
   | ActionType
   | ActionObject<TContext>
-  | InternalAction<TContext>
   | ActionFunction<TContext>;
@@ -54,12 +52,14 @@ export type StateKey = string | State<any>;
 
-export type ConditionPredicate<TContext> = (
+export type ConditionPredicate<TContext, TEvents extends EventObject> = (
   context: TContext,
-  event: EventObject,
+  event: TEvents,
   microstepState: StateValue
 ) => boolean;
 
-export type Condition<TContext> = string | ConditionPredicate<TContext>;
+export type Condition<TContext, TEvents extends EventObject> =
+  | string
+  | ConditionPredicate<TContext, TEvents>;
 
-export interface TransitionConfig<TContext = DefaultContext> {
-  cond?: Condition<TContext>;
+export interface TransitionConfig<TContext, TEvents extends EventObject> {
+  cond?: Condition<TContext, TEvents>;
   actions?: SingleOrArray<Action<TContext>>;
@@ -71,15 +71,16 @@ in?: StateValue;
 
-export interface TargetTransitionConfig<TContext = DefaultContext>
-  extends TransitionConfig<TContext> {
+export interface TargetTransitionConfig<TContext, TEvents extends EventObject>
+  extends TransitionConfig<TContext, TEvents> {
   target: string | string[] | undefined;
 }
 
-export type ConditionalTransitionConfig<TContext = DefaultContext> = Array<
-  TransitionConfig<TContext>
->;
+export type ConditionalTransitionConfig<
+  TContext = DefaultContext,
+  TEvents extends EventObject = EventObject
+> = Array<TransitionConfig<TContext, TEvents>>;
 
-export type Transition<TContext = DefaultContext> =
+export type Transition<TContext, TEvents extends EventObject = EventObject> =
   | string
-  | TransitionConfig<TContext>
-  | ConditionalTransitionConfig<TContext>;
+  | TransitionConfig<TContext, TEvents>
+  | ConditionalTransitionConfig<TContext, TEvents>;
 
@@ -94,3 +95,3 @@ export interface ActivityConfig<TContext> {
 export interface ActivityDefinition<TContext> extends ActionObject<TContext> {
-  type: ActionType;
+  type: string;
   start?: ActionObject<TContext>;
@@ -105,13 +106,15 @@ stop?: ActionObject<TContext>;
 
-export interface DelayedTransitionConfig<TContext>
-  extends TransitionConfig<TContext> {
+export interface DelayedTransitionConfig<TContext, TEvents extends EventObject>
+  extends TransitionConfig<TContext, TEvents> {
   delay: number;
 }
 
-export type DelayedTransitions<TContext> =
+export type DelayedTransitions<TContext, TEvents extends EventObject> =
   | Record<
       string,
-      string | TransitionConfig<TContext> | Array<TransitionConfig<TContext>>
+      | string
+      | TransitionConfig<TContext, TEvents>
+      | Array<TransitionConfig<TContext, TEvents>>
     >
-  | Array<DelayedTransitionConfig<TContext>>;
+  | Array<DelayedTransitionConfig<TContext, TEvents>>;
 
@@ -127,5 +130,69 @@ export type StateTypes =
 
-export interface StateNodeConfig<TContext = DefaultContext, TData = any> {
+export type StateNodesConfig<
+  TContext,
+  TStateSchema extends StateSchema,
+  TEvents extends EventObject
+> = {
+  [K in keyof TStateSchema['states']]: StateNode<
+    TContext,
+    TStateSchema['states'][K],
+    TEvents
+  >
+};
+
+export type StatesConfig<
+  TContext,
+  TStateSchema extends StateSchema,
+  TEvents extends EventObject
+> = {
+  [K in keyof TStateSchema['states']]: StateNodeConfig<
+    TContext,
+    TStateSchema['states'][K],
+    TEvents
+  >
+};
+
+export type StatesDefinition<
+  TContext,
+  TStateSchema extends StateSchema,
+  TEvents extends EventObject
+> = {
+  [K in keyof TStateSchema['states']]: StateNodeDefinition<
+    TContext,
+    TStateSchema['states'][K],
+    TEvents
+  >
+};
+
+export type TransitionsConfig<TContext, TEvents extends EventObject> = {
+  [K in TEvents['type'] | BuiltInEvent<TEvents>['type']]?:
+    | string
+    | TransitionConfig<
+        TContext,
+        TEvents extends { type: K } ? TEvents : EventObject
+      >
+    | Array<
+        TransitionConfig<
+          TContext,
+          TEvents extends { type: K } ? TEvents : EventObject
+        >
+      >
+};
+
+export type TransitionsDefinition<TContext, TEvents extends EventObject> = {
+  [K in TEvents['type']]: Array<
+    TransitionDefinition<
+      TContext,
+      TEvents extends { type: K } ? TEvents : EventObject
+    >
+  >
+};
+
+export interface StateNodeConfig<
+  TContext,
+  TStateSchema extends StateSchema,
+  TEvents extends EventObject
+> {
   key?: string;
-  initial?: string | undefined;
+  initial?: keyof TStateSchema['states'] | undefined;
   parallel?: boolean | undefined;
@@ -139,11 +206,12 @@ type?: StateTypes;
   history?: 'shallow' | 'deep' | boolean | undefined;
-  states?: Record<string, StateNodeConfig<TContext>> | undefined;
-  on?: Record<string, Transition<TContext> | undefined>;
+  states?: StatesConfig<TContext, TStateSchema, TEvents> | undefined;
+  // on?: Record<string, Transition<TContext> | undefined>;
+  on?: TransitionsConfig<TContext, TEvents>;
   onEntry?: SingleOrArray<Action<TContext>>;
   onExit?: SingleOrArray<Action<TContext>>;
-  after?: DelayedTransitions<TContext>;
+  after?: DelayedTransitions<TContext, TEvents>;
   activities?: SingleOrArray<Activity<TContext>>;
   parent?: StateNode<TContext>;
   strict?: boolean | undefined;
-  data?: TData;
+  data?: TStateSchema extends { data: infer D } ? D : any;
   id?: string | undefined;
@@ -154,20 +222,23 @@ delimiter?: string;
 
-export interface StateNodeDefinition<TContext = DefaultContext, TData = any>
-  extends StateNodeConfig<TContext> {
+export interface StateNodeDefinition<
+  TContext,
+  TStateSchema extends StateSchema,
+  TEvents extends EventObject
+> extends StateNodeConfig<TContext, TStateSchema, TEvents> {
   id: string;
   key: string;
   type: StateTypes;
-  initial: string | undefined;
+  initial: StateNodeConfig<TContext, TStateSchema, TEvents>['initial'];
   history: boolean | 'shallow' | 'deep' | undefined;
-  states: Record<string, StateNodeDefinition<TContext>>;
-  on: Record<string, Array<TransitionDefinition<TContext>>>;
+  states: StatesDefinition<TContext, TStateSchema, TEvents>;
+  on: TransitionsDefinition<TContext, TEvents>;
   onEntry: Array<Action<TContext>>;
   onExit: Array<Action<TContext>>;
-  after: Array<DelayedTransitionDefinition<TContext>>;
+  after: Array<DelayedTransitionDefinition<TContext, TEvents>>;
   activities: Array<ActivityDefinition<TContext>>;
-  data: TData;
+  data: any;
   order: number;
 }
-export interface SimpleStateNodeConfig<TContext>
-  extends StateNodeConfig<TContext> {
+export interface SimpleStateNodeConfig<TContext, TEvents extends EventObject>
+  extends StateNodeConfig<TContext, never, TEvents> {
   initial?: undefined;
@@ -178,4 +249,4 @@ parallel?: false | undefined;
 
-export interface HistoryStateNodeConfig<TContext>
-  extends SimpleStateNodeConfig<TContext> {
+export interface HistoryStateNodeConfig<TContext, TEvents extends EventObject>
+  extends SimpleStateNodeConfig<TContext, TEvents> {
   history: 'shallow' | 'deep' | true;
@@ -185,12 +256,18 @@ target: StateValue | undefined;
 
-export interface CompoundStateNodeConfig<TContext>
-  extends StateNodeConfig<TContext> {
-  initial?: string;
+export interface CompoundStateNodeConfig<
+  TContext,
+  TStateSchema extends StateSchema,
+  TEvents extends EventObject
+> extends StateNodeConfig<TContext, TStateSchema, TEvents> {
   parallel?: boolean;
-  states: Record<string, StateNodeConfig<TContext>>;
+  states: StateNodeConfig<TContext, TStateSchema, TEvents>['states'];
 }
 
-export type SimpleOrCompoundStateNodeConfig<TContext> =
-  | SimpleStateNodeConfig<TContext>
-  | CompoundStateNodeConfig<TContext>;
+export type SimpleOrCompoundStateNodeConfig<
+  TContext,
+  TStateSchema extends StateSchema,
+  TEvents extends EventObject
+> =
+  | SimpleStateNodeConfig<TContext, TEvents>
+  | CompoundStateNodeConfig<TContext, TStateSchema, TEvents>;
 
@@ -201,16 +278,26 @@ export type ActionFunctionMap<TContext> = Record<
 >;
-export interface MachineOptions<TContext> {
-  guards?: Record<string, ConditionPredicate<TContext>>;
+
+export interface MachineOptions<TContext, TEvents extends EventObject> {
+  guards?: Record<string, ConditionPredicate<TContext, TEvents>>;
   actions?: ActionFunctionMap<TContext>;
   activities?: Record<string, ActivityConfig<TContext>>;
 }
-export type MachineConfig<TContext> = CompoundStateNodeConfig<TContext>;
+export type MachineConfig<
+  TContext,
+  TStateSchema extends StateSchema,
+  TEvents extends EventObject
+> = CompoundStateNodeConfig<TContext, TStateSchema, TEvents>;
 
-export interface StandardMachineConfig<TContext>
-  extends CompoundStateNodeConfig<TContext> {}
+export interface StandardMachineConfig<
+  TContext,
+  TStateSchema extends StateSchema,
+  TEvents extends EventObject
+> extends CompoundStateNodeConfig<TContext, TStateSchema, TEvents> {}
 
-export interface ParallelMachineConfig<TContext>
-  extends CompoundStateNodeConfig<TContext> {
-  initial?: string | undefined;
-  parallel?: true;
+export interface ParallelMachineConfig<
+  TContext,
+  TStateSchema extends StateSchema,
+  TEvents extends EventObject
+> extends CompoundStateNodeConfig<TContext, TStateSchema, TEvents> {
+  initial?: undefined;
   type?: 'parallel';
@@ -224,30 +311,2 @@ }
 
-// export interface IStateNode<TContext = DefaulTContext> {
-//   key: string;
-//   id: string;
-//   initial: string | undefined;
-//   parallel: boolean;
-//   transient: boolean;
-//   history: false | 'shallow' | 'deep';
-//   states: Record<string, IStateNode<TContext = DefaulTContext>>;
-//   on?: Record<string, Transition<TContext = DefaulTContext>>;
-//   onEntry?: Action | Action[];
-//   onExit?: Action | Action[];
-//   parent: StateNode | undefined;
-//   machine: Machine;
-//   config: StateNodeConfig<TContext = DefaulTContext>;
-// }
-
-export interface ComplexStateNode<TContext> extends StateNode<TContext> {
-  initial: string;
-  history: false;
-}
-
-export interface LeafStateNode<TContext> extends StateNode<TContext> {
-  initial: never;
-  parallel: never;
-  states: never;
-  parent: StateNode<TContext>;
-}
-
 export interface HistoryStateNode<TContext> extends StateNode<TContext> {
@@ -258,17 +317,11 @@ history: 'shallow' | 'deep';
 
-export interface Machine<TContext = DefaultContext>
-  extends StateNode<TContext> {
+export interface Machine<
+  TContext,
+  TStateSchema extends StateSchema,
+  TEvents extends EventObject
+> extends StateNode<TContext, TStateSchema, TEvents> {
   id: string;
-  states: Record<string, StateNode<TContext>>;
+  states: StateNode<TContext, TStateSchema, TEvents>['states'];
 }
 
-export interface StandardMachine<TContext> extends Machine<TContext> {
-  initial: string;
-  parallel: false;
-}
-
-export interface ParallelMachine<TContext> extends Machine<TContext> {
-  initial: undefined;
-  parallel: true;
-}
 export interface ActionMap<TContext> {
@@ -288,7 +341,2 @@ onEntry: Array<Action<TContext>>;
 }
-export type MaybeStateValueActionsTuple<TContext> = [
-  StateValue | undefined,
-  ActionMap<TContext>,
-  ActivityMap | undefined
-];
 
@@ -316,9 +364,22 @@ // tslint:disable-next-line:class-name
   Cancel = 'xstate.cancel',
-  Null = 'xstate.null',
+  Null = '',
   Assign = 'xstate.assign',
   After = 'xstate.after',
   DoneState = 'done.state',
-  Log = 'xstate.log'
+  Log = 'xstate.log',
+  Init = 'xstate.init'
 }
 
+export interface RaisedEvent<TEvents extends EventObject> {
+  type: ActionTypes.Raise;
+  event: TEvents;
+}
+export type BuiltInEvent<TEvents extends EventObject> =
+  | { type: ActionTypes.Null }
+  | RaisedEvent<TEvents>
+  | { type: ActionTypes.Init };
+export type AnyEvent<TEvents extends EventObject> =
+  | TEvents
+  | BuiltInEvent<TEvents>;
+
 export interface ActivityActionObject<TContext> extends ActionObject<TContext> {
@@ -330,4 +391,5 @@ type: ActionTypes.Start | ActionTypes.Stop;
 
-export interface SendAction extends ActionObject<any> {
-  event: EventObject;
+export interface SendAction<TContext, TEvents extends EventObject>
+  extends ActionObject<TContext> {
+  event: TEvents;
   delay?: number;
@@ -345,11 +407,11 @@ id: string | number;
 
-export type Assigner<TContext> = (
+export type Assigner<TContext, TEvents extends EventObject> = (
   extState: TContext,
-  event: EventObject
+  event: TEvents
 ) => Partial<TContext>;
 
-export type PropertyAssigner<TContext> = Partial<
+export type PropertyAssigner<TContext, TEvents extends EventObject> = Partial<
   {
     [K in keyof TContext]:
-      | ((extState: TContext, event: EventObject) => TContext[K])
+      | ((extState: TContext, event: TEvents) => TContext[K])
       | TContext[K]
@@ -359,8 +421,9 @@ }
 
-export interface AssignAction<TContext> extends ActionObject<TContext> {
-  assignment: Assigner<TContext> | PropertyAssigner<TContext>;
+export interface AssignAction<TContext, TEvents extends EventObject>
+  extends ActionObject<TContext> {
+  assignment: Assigner<TContext, TEvents> | PropertyAssigner<TContext, TEvents>;
 }
 
-export interface TransitionDefinition<TContext>
-  extends TransitionConfig<TContext> {
+export interface TransitionDefinition<TContext, TEvents extends EventObject>
+  extends TransitionConfig<TContext, TEvents> {
   actions: Array<Action<TContext>>;
@@ -371,22 +434,31 @@ event: string;
 
-export interface DelayedTransitionDefinition<TContext>
-  extends TransitionDefinition<TContext> {
+export interface DelayedTransitionDefinition<
+  TContext,
+  TEvents extends EventObject
+> extends TransitionDefinition<TContext, TEvents> {
   delay: number;
 }
 
-export interface Edge<TContext> {
-  event: string;
+export interface Edge<
+  TContext,
+  TEvents extends EventObject,
+  TEventType extends TEvents['type'] = string
+> {
+  event: TEventType;
   source: StateNode<TContext>;
   target: StateNode<TContext>;
-  cond?: Condition<TContext>;
+  cond?: Condition<TContext, TEvents & { type: TEventType }>;
   actions: Array<Action<TContext>>;
   meta?: MetaObject;
-  transition: TransitionDefinition<TContext>;
+  transition: TransitionDefinition<TContext, TEvents>;
 }
-export interface NodesAndEdges<TContext> {
+export interface NodesAndEdges<TContext, TEvents extends EventObject> {
   nodes: StateNode[];
-  edges: Array<Edge<TContext>>;
+  edges: Array<Edge<TContext, TEvents, TEvents['type']>>;
 }
 
-export interface Segment<TContext = DefaultContext> {
+export interface Segment<
+  TContext = DefaultContext,
+  TEvents extends EventObject = EventObject
+> {
   /**
@@ -401,3 +473,3 @@ * From state
    */
-  event: Event;
+  event: Event<TEvents>;
 }
@@ -442,3 +514,3 @@
   TContext = DefaultContext,
-  TData = DefaultData
+  TEvents extends EventObject = EventObject
 > {
@@ -449,6 +521,13 @@ value: StateValue;
   activities: ActivityMap;
-  data: TData;
-  events: EventObject[];
+  data: any;
+  events: TEvents[];
   context: TContext;
   toStrings: () => string[];
 }
+
+export interface StateSchema {
+  data?: any;
+  states?: {
+    [key: string]: StateSchema;
+  };
+}

src/utils.ts

 import { State } from './State';
-import { Event, StateValue, EventType, ActionType, Action } from './types';
+import { Event, StateValue, ActionType, Action, EventObject } from './types';
 
-export function getEventType(event: Event): EventType {
+export function getEventType<TEvents extends EventObject = EventObject>(
+  event: Event<TEvents>
+): TEvents['type'] {
   try {
     return typeof event === 'string' || typeof event === 'number'
       ? `${event}`
-      : event.type;
+      : (event as TEvents).type;
   } catch (e) {
@@ -10,0 +12,0 @@ throw new Error(

test/graph.test.ts

@@ -69,3 +69,7 @@ import { assert } from 'chai';
 
-  const condMachine = Machine<{ id: string }>({
+  const condMachine = Machine<
+    { id: string },
+    any,
+    { type: 'EVENT'; id: string } | { type: 'STATE' }
+  >({
     key: 'cond',
@@ -72,0 +76,0 @@ initial: 'pending',

test/guards.test.ts

@@ -5,2 +5,6 @@ import { assert } from 'chai';
 describe('guard conditions', () => {
+  // type LightMachineEvents =
+  //   | { type: 'TIMER'; elapsed: number }
+  //   | { type: 'EMERGENCY'; isEmergency: boolean };
+
   const lightMachine = Machine<{ elapsed: number }>(
@@ -7,0 +11,0 @@ {

test/history.test.ts

@@ -70,4 +70,5 @@ import { assert } from 'chai';
     const offState = historyMachine.transition(onSecondState, 'H_POWER');
-    const nextState = historyMachine.transition(offState, 'H_POWER');
-    assert.isUndefined(nextState.history!.history);
+    const onState = historyMachine.transition(offState, 'H_POWER');
+    const nextState = historyMachine.transition(onState, 'H_POWER');
+    assert.isUndefined(nextState.history!.history!.history);
   });
@@ -74,0 +75,0 @@ });

test/machine.test.ts

@@ -23,3 +23,11 @@ import { assert } from 'chai';
 
-  const lightMachine = Machine({
+  interface LightStateSchema {
+    states: {
+      green: any;
+      yellow: any;
+      red: any;
+    };
+  }
+
+  const lightMachine = Machine<undefined, LightStateSchema>({
     key: 'light',
@@ -26,0 +34,0 @@ initial: 'green',

test/state.test.ts

@@ -10,19 +10,50 @@ import { assert } from 'chai';
       on: {
-        INERT: undefined
+        EXTERNAL: {
+          target: 'one',
+          internal: false
+        },
+        INERT: {
+          target: 'one',
+          internal: true
+        },
+        INTERNAL: {
+          target: 'one',
+          internal: true,
+          actions: ['doSomething']
+        },
+        TO_TWO: 'two'
       }
-    }
+    },
+    two: {}
   }
 });
 
-xdescribe('State', () => {
-  xit('should indicate that it is not changed if initial state', () => {
-    assert.ok(machine.initialState.changed);
+describe('State', () => {
+  it('should indicate that it is not changed if initial state', () => {
+    assert.isUndefined(machine.initialState.changed);
   });
 
-  it('should indicate that it is not changed if transition is inert', () => {
-    const changedState = machine.transition(machine.initialState, 'INERT');
+  it('states from external transitions with onEntry actions should be changed', () => {
+    const changedState = machine.transition(machine.initialState, 'EXTERNAL');
+    assert.isTrue(changedState.changed, 'changed due to onEntry action');
+  });
+
+  it('states from internal transitions with no actions should be unchanged', () => {
+    const changedState = machine.transition(machine.initialState, 'EXTERNAL');
     const unchangedState = machine.transition(changedState, 'INERT');
-    assert.isFalse(changedState.changed, 'changed due to onEntry action');
-    assert.isTrue(unchangedState.changed, 'unchanged - same state, no actions');
+    assert.isFalse(
+      unchangedState.changed,
+      'unchanged - same state, no actions'
+    );
   });
+
+  it('states from internal transitions with actions should be changed', () => {
+    const changedState = machine.transition(machine.initialState, 'INTERNAL');
+    assert.isTrue(changedState.changed, 'changed - transition actions');
+  });
+
+  it('normal state transitions should be changed', () => {
+    const changedState = machine.transition(machine.initialState, 'TO_TWO');
+    assert.isTrue(changedState.changed, 'changed - different state');
+  });
 });

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Improved metrics

Total package byte prevSize

1446676

increased by1.28%

Number of package files

193

increased by0.52%

Lines of code

18354

increased by2.18%

Number of lines in readme file

345

increased by2.07%

Worsened metrics

Number of low supply chain risk alerts

4

increased by100%

No dependency changes