dom-mutator - npm Package Compare versions

Comparing version 0.4.0 to 0.5.0

dist/dom-mutator.cjs.development.js

@@ -66,3 +66,8 @@ 'use strict';
 
-  if (val !== currentVal) {
+  if (val && typeof val !== 'string') {
+    if (!currentVal || val.parentNode !== currentVal.parentNode || val.insertBeforeNode !== currentVal.insertBeforeNode) {
+      record.isDirty = true;
+      queueDOMUpdates();
+    }
+  } else if (val !== currentVal) {
     record.isDirty = true;
@@ -97,2 +102,27 @@ queueDOMUpdates();
 
+function _loadDOMNodes(_ref) {
+  var parentSelector = _ref.parentSelector,
+      insertBeforeSelector = _ref.insertBeforeSelector;
+  var parentNode = document.querySelector(parentSelector);
+  if (!parentNode) return null;
+  var insertBeforeNode = insertBeforeSelector ? document.querySelector(insertBeforeSelector) : null;
+  if (insertBeforeSelector && !insertBeforeNode) return null;
+  return {
+    parentNode: parentNode,
+    insertBeforeNode: insertBeforeNode
+  };
+}
+
+function positionMutationRunner(record) {
+  var val = record.originalValue;
+  record.mutations.forEach(function (m) {
+    var selectors = m.mutate();
+
+    var newNodes = _loadDOMNodes(selectors);
+
+    val = newNodes || val;
+  });
+  queueIfNeeded(val, record);
+}
+
 var getHTMLValue = function getHTMLValue(el) {
@@ -116,2 +146,23 @@ return el.innerHTML;
 
+var getElementPosition = function getElementPosition(el) {
+  return {
+    parentNode: el.parentElement,
+    insertBeforeNode: el.nextElementSibling
+  };
+};
+
+var setElementPosition = function setElementPosition(el, value) {
+  value.parentNode.insertBefore(el, value.insertBeforeNode);
+};
+
+function getElementPositionRecord(element) {
+  var elementRecord = getElementRecord(element);
+
+  if (!elementRecord.position) {
+    elementRecord.position = createElementPropertyRecord(element, 'position', getElementPosition, setElementPosition, positionMutationRunner);
+  }
+
+  return elementRecord.position;
+}
+
 var setClassValue = function setClassValue(el, val) {
@@ -173,2 +224,7 @@ return val ? el.className = val : el.removeAttribute('class');
     delete element.classes;
+  } else if (attr === 'position') {
+    var _element$position, _element$position$obs;
+
+    (_element$position = element.position) == null ? void 0 : (_element$position$obs = _element$position.observer) == null ? void 0 : _element$position$obs.disconnect();
+    delete element.position;
   } else {
@@ -210,2 +266,3 @@ var _element$attributes, _element$attributes$a, _element$attributes$a2;
   m.classes && setPropertyValue(el, 'class', m.classes);
+  m.position && setPropertyValue(el, 'position', m.position);
   Object.keys(m.attributes).forEach(function (attr) {
@@ -238,2 +295,4 @@ setPropertyValue(el, attr, m.attributes[attr]);
     record = getElementAttributeRecord(element, mutation.attribute);
+  } else if (mutation.kind === 'position') {
+    record = getElementPositionRecord(element);
   }
@@ -256,2 +315,4 @@
     record = getElementAttributeRecord(el, mutation.attribute);
+  } else if (mutation.kind === 'position') {
+    record = getElementPositionRecord(el);
   }
@@ -346,2 +407,11 @@
 
+function position(selector, mutate) {
+  return newMutation({
+    kind: 'position',
+    elements: new Set(),
+    mutate: mutate,
+    selector: selector
+  });
+}
+
 function classes(selector, mutate) {
@@ -379,7 +449,9 @@ return newMutation({
 
-function declarative(_ref) {
-  var selector = _ref.selector,
-      action = _ref.action,
-      value = _ref.value,
-      attr = _ref.attribute;
+function declarative(_ref2) {
+  var selector = _ref2.selector,
+      action = _ref2.action,
+      value = _ref2.value,
+      attr = _ref2.attribute,
+      parentSelector = _ref2.parentSelector,
+      insertBeforeSelector = _ref2.insertBeforeSelector;
 
@@ -411,2 +483,11 @@ if (attr === 'html') {
     }
+  } else if (attr === 'position') {
+    if (action === 'set' && parentSelector) {
+      return position(selector, function () {
+        return {
+          insertBeforeSelector: insertBeforeSelector,
+          parentSelector: parentSelector
+        };
+      });
+    }
   } else {
@@ -435,2 +516,3 @@ if (action === 'append') {
   attribute: attribute,
+  position: position,
   declarative: declarative
@@ -437,0 +519,0 @@ };

dist/dom-mutator.cjs.production.min.js

@@ -1,2 +0,2 @@
-"use strict";Object.defineProperty(exports,"__esModule",{value:!0});var t=/^[a-zA-Z:_][a-zA-Z0-9:_.-]*$/,e={revert:function(){}},n=new Map,r=new Set;function u(t){var e=n.get(t);return e||n.set(t,e={element:t,attributes:{}}),e}function i(t,e,n,r,u){var i=n(t),a={isDirty:!1,originalValue:i,virtualValue:i,mutations:[],el:t,observer:new MutationObserver((function(){var e=n(t);e!==a.virtualValue&&(a.originalValue=e,u(a))})),mutationRunner:u,setValue:r,getCurrentValue:n};return a.observer.observe(t,function(t){return"html"===t?{childList:!0,subtree:!0,attributes:!0,characterData:!0}:{childList:!1,subtree:!1,attributes:!0,attributeFilter:[t]}}(e)),a}function a(t,e){var n=e.getCurrentValue(e.el);e.virtualValue=t,t!==n&&(e.isDirty=!0,E||(E=!0,requestAnimationFrame(A)))}function l(t){var e=t.originalValue;t.mutations.forEach((function(t){return e=t.mutate(e)})),a(function(t){return d||(d=document.createElement("div")),d.innerHTML=t,d.innerHTML}(e),t)}function s(t){var e=new Set(t.originalValue.split(/\s+/).filter(Boolean));t.mutations.forEach((function(t){return t.mutate(e)})),a(Array.from(e).filter(Boolean).join(" "),t)}function o(t){var e=t.originalValue;t.mutations.forEach((function(t){return e=t.mutate(e)})),a(e,t)}var c=function(t){return t.innerHTML},f=function(t,e){return t.innerHTML=e};function m(t){var e=u(t);return e.html||(e.html=i(t,"html",c,f,l)),e.html}var d,v=function(t,e){return e?t.className=e:t.removeAttribute("class")},b=function(t){return t.className};function h(t){var e=u(t);return e.classes||(e.classes=i(t,"class",b,v,s)),e.classes}function p(t,e){var n,r=u(t);return r.attributes[e]||(r.attributes[e]=i(t,e,(n=e,function(t){var e;return null!=(e=t.getAttribute(n))?e:null}),function(t){return function(e,n){return null!==n?e.setAttribute(t,n):e.removeAttribute(t)}}(e),o)),r.attributes[e]}function V(t,e,r){if(r.isDirty){r.isDirty=!1;var u=r.virtualValue;r.mutations.length||function(t,e){var r,u,i=n.get(t);if(i)if("html"===e)null==(r=i.html)||null==(u=r.observer)||u.disconnect(),delete i.html;else if("class"===e){var a,l;null==(a=i.classes)||null==(l=a.observer)||l.disconnect(),delete i.classes}else{var s,o,c;null==(s=i.attributes)||null==(o=s[e])||null==(c=o.observer)||c.disconnect(),delete i.attributes[e]}}(t,e),r.setValue(t,u)}}var g,E=!1;function y(t,e){t.html&&V(e,"html",t.html),t.classes&&V(e,"class",t.classes),Object.keys(t.attributes).forEach((function(n){V(e,n,t.attributes[n])}))}function A(){E=!1,n.forEach(y)}function k(t,e){var n=null;if("html"===t.kind?n=m(e):"class"===t.kind?n=h(e):"attribute"===t.kind&&(n=p(e,t.attribute)),n){var r=n.mutations.indexOf(t);-1!==r&&n.mutations.splice(r,1),n.mutationRunner(n)}}function w(t){var e=new Set(t.elements),n=new Set;document.querySelectorAll(t.selector).forEach((function(r){n.add(r),e.has(r)||(t.elements.add(r),function(t,e){var n=null;"html"===t.kind?n=m(e):"class"===t.kind?n=h(e):"attribute"===t.kind&&(n=p(e,t.attribute)),n&&(n.mutations.push(t),n.mutationRunner(n))}(t,r))})),e.forEach((function(e){n.has(e)||(t.elements.delete(e),k(t,e))}))}function M(){r.forEach(w)}function S(){"undefined"!=typeof document&&(g||(g=new MutationObserver((function(){M()}))),M(),g.observe(document.documentElement,{childList:!0,subtree:!0,attributes:!1,characterData:!1}))}function L(t){return"undefined"==typeof document?e:(r.add(t),w(t),{revert:function(){var e;(e=t).elements.forEach((function(t){return k(e,t)})),e.elements.clear(),r.delete(e)}})}function O(t,e){return L({kind:"html",elements:new Set,mutate:e,selector:t})}function x(t,e){return L({kind:"class",elements:new Set,mutate:e,selector:t})}function D(n,r,u){return t.test(r)?"class"===r||"className"===r?x(n,(function(t){var e=u(Array.from(t).join(" "));t.clear(),e&&e.split(/\s+/g).filter(Boolean).forEach((function(e){return t.add(e)}))})):L({kind:"attribute",attribute:r,elements:new Set,mutate:u,selector:n}):e}S();var j={html:O,classes:x,attribute:D,declarative:function(t){var n=t.selector,r=t.action,u=t.value,i=t.attribute;if("html"===i){if("append"===r)return O(n,(function(t){return t+(null!=u?u:"")}));if("set"===r)return O(n,(function(){return null!=u?u:""}))}else if("class"===i){if("append"===r)return x(n,(function(t){u&&t.add(u)}));if("remove"===r)return x(n,(function(t){u&&t.delete(u)}));if("set"===r)return x(n,(function(t){t.clear(),u&&t.add(u)}))}else{if("append"===r)return D(n,i,(function(t){return null!==t?t+(null!=u?u:""):null!=u?u:""}));if("set"===r)return D(n,i,(function(){return null!=u?u:""}));if("remove"===r)return D(n,i,(function(){return null}))}return e}};exports.connectGlobalObserver=S,exports.default=j,exports.disconnectGlobalObserver=function(){g&&g.disconnect()},exports.validAttributeName=t;
+"use strict";Object.defineProperty(exports,"__esModule",{value:!0});var e=/^[a-zA-Z:_][a-zA-Z0-9:_.-]*$/,t={revert:function(){}},n=new Map,r=new Set;function i(e){var t=n.get(e);return t||n.set(e,t={element:e,attributes:{}}),t}function u(e,t,n,r,i){var u=n(e),o={isDirty:!1,originalValue:u,virtualValue:u,mutations:[],el:e,observer:new MutationObserver((function(){var t=n(e);t!==o.virtualValue&&(o.originalValue=t,i(o))})),mutationRunner:i,setValue:r,getCurrentValue:n};return o.observer.observe(e,function(e){return"html"===e?{childList:!0,subtree:!0,attributes:!0,characterData:!0}:{childList:!1,subtree:!1,attributes:!0,attributeFilter:[e]}}(t)),o}function o(e,t){var n=t.getCurrentValue(t.el);t.virtualValue=e,e&&"string"!=typeof e?n&&e.parentNode===n.parentNode&&e.insertBeforeNode===n.insertBeforeNode||(t.isDirty=!0,A()):e!==n&&(t.isDirty=!0,A())}function a(e){var t=e.originalValue;e.mutations.forEach((function(e){return t=e.mutate(t)})),o(function(e){return h||(h=document.createElement("div")),h.innerHTML=e,h.innerHTML}(t),e)}function l(e){var t=new Set(e.originalValue.split(/\s+/).filter(Boolean));e.mutations.forEach((function(e){return e.mutate(t)})),o(Array.from(t).filter(Boolean).join(" "),e)}function s(e){var t=e.originalValue;e.mutations.forEach((function(e){return t=e.mutate(t)})),o(t,e)}function c(e){var t=e.originalValue;e.mutations.forEach((function(e){var n=function(e){var t=e.insertBeforeSelector,n=document.querySelector(e.parentSelector);if(!n)return null;var r=t?document.querySelector(t):null;return t&&!r?null:{parentNode:n,insertBeforeNode:r}}(e.mutate());t=n||t})),o(t,e)}var f=function(e){return e.innerHTML},d=function(e,t){return e.innerHTML=t};function m(e){var t=i(e);return t.html||(t.html=u(e,"html",f,d,a)),t.html}var v=function(e){return{parentNode:e.parentElement,insertBeforeNode:e.nextElementSibling}},b=function(e,t){t.parentNode.insertBefore(e,t.insertBeforeNode)};function p(e){var t=i(e);return t.position||(t.position=u(e,"position",v,b,c)),t.position}var h,S=function(e,t){return t?e.className=t:e.removeAttribute("class")},g=function(e){return e.className};function y(e){var t=i(e);return t.classes||(t.classes=u(e,"class",g,S,l)),t.classes}function E(e,t){var n,r=i(e);return r.attributes[t]||(r.attributes[t]=u(e,t,(n=t,function(e){var t;return null!=(t=e.getAttribute(n))?t:null}),function(e){return function(t,n){return null!==n?t.setAttribute(e,n):t.removeAttribute(e)}}(t),s)),r.attributes[t]}function N(e,t,r){if(r.isDirty){r.isDirty=!1;var i=r.virtualValue;r.mutations.length||function(e,t){var r,i,u=n.get(e);if(u)if("html"===t)null==(r=u.html)||null==(i=r.observer)||i.disconnect(),delete u.html;else if("class"===t){var o,a;null==(o=u.classes)||null==(a=o.observer)||a.disconnect(),delete u.classes}else if("position"===t){var l,s;null==(l=u.position)||null==(s=l.observer)||s.disconnect(),delete u.position}else{var c,f,d;null==(c=u.attributes)||null==(f=c[t])||null==(d=f.observer)||d.disconnect(),delete u.attributes[t]}}(e,t),r.setValue(e,i)}}var V,k=!1;function B(e,t){e.html&&N(t,"html",e.html),e.classes&&N(t,"class",e.classes),e.position&&N(t,"position",e.position),Object.keys(e.attributes).forEach((function(n){N(t,n,e.attributes[n])}))}function w(){k=!1,n.forEach(B)}function A(){k||(k=!0,requestAnimationFrame(w))}function M(e,t){var n=null;if("html"===e.kind?n=m(t):"class"===e.kind?n=y(t):"attribute"===e.kind?n=E(t,e.attribute):"position"===e.kind&&(n=p(t)),n){var r=n.mutations.indexOf(e);-1!==r&&n.mutations.splice(r,1),n.mutationRunner(n)}}function x(e){var t=new Set(e.elements),n=new Set;document.querySelectorAll(e.selector).forEach((function(r){n.add(r),t.has(r)||(e.elements.add(r),function(e,t){var n=null;"html"===e.kind?n=m(t):"class"===e.kind?n=y(t):"attribute"===e.kind?n=E(t,e.attribute):"position"===e.kind&&(n=p(t)),n&&(n.mutations.push(e),n.mutationRunner(n))}(e,r))})),t.forEach((function(t){n.has(t)||(e.elements.delete(t),M(e,t))}))}function D(){r.forEach(x)}function L(){"undefined"!=typeof document&&(V||(V=new MutationObserver((function(){D()}))),D(),V.observe(document.documentElement,{childList:!0,subtree:!0,attributes:!1,characterData:!1}))}function O(e){return"undefined"==typeof document?t:(r.add(e),x(e),{revert:function(){var t;(t=e).elements.forEach((function(e){return M(t,e)})),t.elements.clear(),r.delete(t)}})}function j(e,t){return O({kind:"html",elements:new Set,mutate:t,selector:e})}function q(e,t){return O({kind:"position",elements:new Set,mutate:t,selector:e})}function H(e,t){return O({kind:"class",elements:new Set,mutate:t,selector:e})}function T(n,r,i){return e.test(r)?"class"===r||"className"===r?H(n,(function(e){var t=i(Array.from(e).join(" "));e.clear(),t&&t.split(/\s+/g).filter(Boolean).forEach((function(t){return e.add(t)}))})):O({kind:"attribute",attribute:r,elements:new Set,mutate:i,selector:n}):t}L();var _={html:j,classes:H,attribute:T,position:q,declarative:function(e){var n=e.selector,r=e.action,i=e.value,u=e.attribute,o=e.parentSelector,a=e.insertBeforeSelector;if("html"===u){if("append"===r)return j(n,(function(e){return e+(null!=i?i:"")}));if("set"===r)return j(n,(function(){return null!=i?i:""}))}else if("class"===u){if("append"===r)return H(n,(function(e){i&&e.add(i)}));if("remove"===r)return H(n,(function(e){i&&e.delete(i)}));if("set"===r)return H(n,(function(e){e.clear(),i&&e.add(i)}))}else if("position"===u){if("set"===r&&o)return q(n,(function(){return{insertBeforeSelector:a,parentSelector:o}}))}else{if("append"===r)return T(n,u,(function(e){return null!==e?e+(null!=i?i:""):null!=i?i:""}));if("set"===r)return T(n,u,(function(){return null!=i?i:""}));if("remove"===r)return T(n,u,(function(){return null}))}return t}};exports.connectGlobalObserver=L,exports.default=_,exports.disconnectGlobalObserver=function(){V&&V.disconnect()},exports.validAttributeName=e;
 //# sourceMappingURL=dom-mutator.cjs.production.min.js.map

dist/dom-mutator.esm.js

@@ -62,3 +62,8 @@ var validAttributeName = /^[a-zA-Z:_][a-zA-Z0-9:_.-]*$/;
 
-  if (val !== currentVal) {
+  if (val && typeof val !== 'string') {
+    if (!currentVal || val.parentNode !== currentVal.parentNode || val.insertBeforeNode !== currentVal.insertBeforeNode) {
+      record.isDirty = true;
+      queueDOMUpdates();
+    }
+  } else if (val !== currentVal) {
     record.isDirty = true;
@@ -93,2 +98,27 @@ queueDOMUpdates();
 
+function _loadDOMNodes(_ref) {
+  var parentSelector = _ref.parentSelector,
+      insertBeforeSelector = _ref.insertBeforeSelector;
+  var parentNode = document.querySelector(parentSelector);
+  if (!parentNode) return null;
+  var insertBeforeNode = insertBeforeSelector ? document.querySelector(insertBeforeSelector) : null;
+  if (insertBeforeSelector && !insertBeforeNode) return null;
+  return {
+    parentNode: parentNode,
+    insertBeforeNode: insertBeforeNode
+  };
+}
+
+function positionMutationRunner(record) {
+  var val = record.originalValue;
+  record.mutations.forEach(function (m) {
+    var selectors = m.mutate();
+
+    var newNodes = _loadDOMNodes(selectors);
+
+    val = newNodes || val;
+  });
+  queueIfNeeded(val, record);
+}
+
 var getHTMLValue = function getHTMLValue(el) {
@@ -112,2 +142,23 @@ return el.innerHTML;
 
+var getElementPosition = function getElementPosition(el) {
+  return {
+    parentNode: el.parentElement,
+    insertBeforeNode: el.nextElementSibling
+  };
+};
+
+var setElementPosition = function setElementPosition(el, value) {
+  value.parentNode.insertBefore(el, value.insertBeforeNode);
+};
+
+function getElementPositionRecord(element) {
+  var elementRecord = getElementRecord(element);
+
+  if (!elementRecord.position) {
+    elementRecord.position = createElementPropertyRecord(element, 'position', getElementPosition, setElementPosition, positionMutationRunner);
+  }
+
+  return elementRecord.position;
+}
+
 var setClassValue = function setClassValue(el, val) {
@@ -169,2 +220,7 @@ return val ? el.className = val : el.removeAttribute('class');
     delete element.classes;
+  } else if (attr === 'position') {
+    var _element$position, _element$position$obs;
+
+    (_element$position = element.position) == null ? void 0 : (_element$position$obs = _element$position.observer) == null ? void 0 : _element$position$obs.disconnect();
+    delete element.position;
   } else {
@@ -206,2 +262,3 @@ var _element$attributes, _element$attributes$a, _element$attributes$a2;
   m.classes && setPropertyValue(el, 'class', m.classes);
+  m.position && setPropertyValue(el, 'position', m.position);
   Object.keys(m.attributes).forEach(function (attr) {
@@ -234,2 +291,4 @@ setPropertyValue(el, attr, m.attributes[attr]);
     record = getElementAttributeRecord(element, mutation.attribute);
+  } else if (mutation.kind === 'position') {
+    record = getElementPositionRecord(element);
   }
@@ -252,2 +311,4 @@
     record = getElementAttributeRecord(el, mutation.attribute);
+  } else if (mutation.kind === 'position') {
+    record = getElementPositionRecord(el);
   }
@@ -342,2 +403,11 @@
 
+function position(selector, mutate) {
+  return newMutation({
+    kind: 'position',
+    elements: new Set(),
+    mutate: mutate,
+    selector: selector
+  });
+}
+
 function classes(selector, mutate) {
@@ -375,7 +445,9 @@ return newMutation({
 
-function declarative(_ref) {
-  var selector = _ref.selector,
-      action = _ref.action,
-      value = _ref.value,
-      attr = _ref.attribute;
+function declarative(_ref2) {
+  var selector = _ref2.selector,
+      action = _ref2.action,
+      value = _ref2.value,
+      attr = _ref2.attribute,
+      parentSelector = _ref2.parentSelector,
+      insertBeforeSelector = _ref2.insertBeforeSelector;
 
@@ -407,2 +479,11 @@ if (attr === 'html') {
     }
+  } else if (attr === 'position') {
+    if (action === 'set' && parentSelector) {
+      return position(selector, function () {
+        return {
+          insertBeforeSelector: insertBeforeSelector,
+          parentSelector: parentSelector
+        };
+      });
+    }
   } else {
@@ -431,2 +512,3 @@ if (action === 'append') {
   attribute: attribute,
+  position: position,
   declarative: declarative
@@ -433,0 +515,0 @@ };

dist/index.d.ts

@@ -5,5 +5,6 @@ export declare const validAttributeName: RegExp;
 declare function html(selector: HTMLMutation['selector'], mutate: HTMLMutation['mutate']): MutationController;
+declare function position(selector: PositionMutation['selector'], mutate: PositionMutation['mutate']): MutationController;
 declare function classes(selector: ClassnameMutation['selector'], mutate: ClassnameMutation['mutate']): MutationController;
 declare function attribute(selector: AttrMutation['selector'], attribute: AttrMutation['attribute'], mutate: AttrMutation['mutate']): MutationController;
-declare function declarative({ selector, action, value, attribute: attr, }: DeclarativeMutation): MutationController;
+declare function declarative({ selector, action, value, attribute: attr, parentSelector, insertBeforeSelector, }: DeclarativeMutation): MutationController;
 export declare type MutationController = {
@@ -17,2 +18,4 @@ revert: () => void;
     value?: string;
+    parentSelector?: string;
+    insertBeforeSelector?: string;
 };
@@ -23,4 +26,5 @@ declare const _default: {
     attribute: typeof attribute;
+    position: typeof position;
     declarative: typeof declarative;
 };
 export default _default;

dist/types.d.ts

@@ -18,3 +18,16 @@ interface BaseMutation {
 }
-declare type Mutation = HTMLMutation | ClassnameMutation | AttrMutation;
+interface PositionMutation extends BaseMutation {
+    kind: 'position';
+    mutate: () => ElementPosition;
+}
+interface ElementPosition {
+    parentSelector: string;
+    insertBeforeSelector?: null | string;
+}
+interface ElementPositionWithDomNode {
+    parentNode: HTMLElement;
+    insertBeforeNode: HTMLElement | null;
+}
+declare type Mutation = HTMLMutation | ClassnameMutation | AttrMutation | PositionMutation;
+declare type MutationKind = Mutation['kind'];
 interface ElementPropertyRecord<T, V> {
@@ -34,2 +47,3 @@ observer: MutationObserver;
 declare type AttributeRecord = ElementPropertyRecord<AttrMutation, string | null>;
+declare type PositionRecord = ElementPropertyRecord<PositionMutation, ElementPositionWithDomNode>;
 interface ElementRecord {
@@ -42,2 +56,3 @@ element: Element;
     };
+    position?: PositionRecord;
 }

package.json

 {
-  "version": "0.4.0",
+  "version": "0.5.0",
   "license": "MIT",
   "main": "dist/index.js",
   "typings": "dist/index.d.ts",
-  "files": [
-    "dist",
-    "src"
-  ],
+  "files": ["dist", "src"],
   "engines": {
@@ -11,0 +8,0 @@ "node": ">=10"

README.md

@@ -8,3 +8,3 @@ # DOM Mutator
 ```ts
-const mutation = mutate.html("#greeting", html => html + ' world');
+const mutation = mutate.html('#greeting', (html) => html + ' world');
 
@@ -28,9 +28,13 @@ // works even if the selector doesn't exist yet
 ```ts
-import mutate from "dom-mutator";
+import mutate from 'dom-mutator';
 
-mutate.html("h1", html => html.toUpperCase());
+mutate.html('h1', (html) => html.toUpperCase());
 
-mutate.classes("div.greeting", classes => classes.add("new-class"));
+mutate.classes('div.greeting', (classes) => classes.add('new-class'));
 
-mutate.attribute(".get-started", "title", (oldVal) => "This is my new title attribute");
+mutate.attribute(
+    '.get-started',
+    'title',
+    (oldVal) => 'This is my new title attribute'
+);
 ```
@@ -40,7 +44,7 @@
 
-*  No dependencies, written in Typescript, 100% test coverage
-*  Super fast and light-weight (1Kb gzipped)
-*  Persists mutations even if the underlying element is updated externally (e.g. by a React render)
-*  Picks up new matching elements that are added to the DOM
-*  Easily remove a mutation at any time
+-   No dependencies, written in Typescript, 100% test coverage
+-   Super fast and light-weight (1Kb gzipped)
+-   Persists mutations even if the underlying element is updated externally (e.g. by a React render)
+-   Picks up new matching elements that are added to the DOM
+-   Easily remove a mutation at any time
 
@@ -64,4 +68,4 @@ ![Build Status](https://github.com/growthbook/dom-mutator/workflows/CI/badge.svg)
 <script type="module">
-import mutate from "https://unpkg.com/dom-mutator/dist/dom-mutator.esm.js";
-...
+    import mutate from "https://unpkg.com/dom-mutator/dist/dom-mutator.esm.js";
+    ...
 </script>
@@ -113,2 +117,14 @@ ```
 
+### position
+
+Mutate the position of an HTML element by supplying a target parent element to append it to (and optional sibling element to place it next to).
+
+```ts
+// Signature
+mutate.position(selector: string, () => ({ parentSelector: string; insertBeforeSelector?: string; }));
+
+// Example
+mutate.attribute(".link", () => ({ parentSelector: '.parent', insertBeforeSelector: 'p.body' }));
+```
+
 ### declarative
@@ -122,6 +138,6 @@
 mutate.declarative({
-  selector: string,
-  action: "set" | "append" | "remove",
-  attribute: "html" | "class" | string,
-  value: string
+    selector: string,
+    action: 'set' | 'append' | 'remove',
+    attribute: 'html' | 'class' | string,
+    value: string,
 });
@@ -131,22 +147,29 @@
 const mutations = [
-  {
-    selector: "h1",
-    action: "set",
-    attribute: "html",
-    value: "new text"
-  },
-  {
-    selector: ".get-started",
-    action: "remove",
-    attribute: "class",
-    value: "green"
-  },
-  {
-    selector: "a",
-    action: "append",
-    attribute: "href",
-    value: "?foo"
-  }
+    {
+        selector: 'h1',
+        action: 'set',
+        attribute: 'html',
+        value: 'new text',
+    },
+    {
+        selector: '.get-started',
+        action: 'remove',
+        attribute: 'class',
+        value: 'green',
+    },
+    {
+        selector: 'a',
+        action: 'append',
+        attribute: 'href',
+        value: '?foo',
+    },
+    {
+        selector: 'a',
+        action: 'set',
+        attribute: 'position',
+        parentSelector: '.header',
+        insertBeforeSelector: '.menu-button',
+    },
 ];
-mutations.forEach(m=>mutate.declarative(m));
+mutations.forEach((m) => mutate.declarative(m));
 ```
@@ -158,3 +181,3 @@
 
-When a matching element is found, we attach a separate MutationObserver filtered to the exact attribute being mutated.  If an external change happens (e.g. from a React render), we re-apply your mutation on top of the new baseline value.
+When a matching element is found, we attach a separate MutationObserver filtered to the exact attribute being mutated. If an external change happens (e.g. from a React render), we re-apply your mutation on top of the new baseline value.
 
@@ -172,3 +195,3 @@ When `revert` is called, we undo the change and go back to the last externally set value. We also disconnect the element's MutationObserver to save resources.
 ```ts
-import {disconnectGlobalObserver, connectGlobalObserver} from "dom-mutator";
+import { disconnectGlobalObserver, connectGlobalObserver } from 'dom-mutator';
 
@@ -175,0 +198,0 @@ // Pause

src/index.ts

@@ -65,3 +65,3 @@ export const validAttributeName = /^[a-zA-Z:_][a-zA-Z0-9:_.-]*$/;
 function queueIfNeeded(
-  val: string | null,
+  val: string | null | ElementPositionWithDomNode,
   record: ElementPropertyRecord<any, any>
@@ -71,3 +71,12 @@ ) {
   record.virtualValue = val;
-  if (val !== currentVal) {
+  if (val && typeof val !== 'string') {
+    if (
+      !currentVal ||
+      val.parentNode !== currentVal.parentNode ||
+      val.insertBeforeNode !== currentVal.insertBeforeNode
+    ) {
+      record.isDirty = true;
+      queueDOMUpdates();
+    }
+  } else if (val !== currentVal) {
     record.isDirty = true;
@@ -93,2 +102,3 @@ queueDOMUpdates();
 }
+
 function attrMutationRunner(record: AttributeRecord) {
@@ -100,2 +110,28 @@ let val: string | null = record.originalValue;
 
+function _loadDOMNodes({
+  parentSelector,
+  insertBeforeSelector,
+}: ElementPosition): ElementPositionWithDomNode | null {
+  const parentNode = document.querySelector<HTMLElement>(parentSelector);
+  if (!parentNode) return null;
+  const insertBeforeNode = insertBeforeSelector
+    ? document.querySelector<HTMLElement>(insertBeforeSelector)
+    : null;
+  if (insertBeforeSelector && !insertBeforeNode) return null;
+  return {
+    parentNode,
+    insertBeforeNode,
+  };
+}
+
+function positionMutationRunner(record: PositionRecord) {
+  let val = record.originalValue;
+  record.mutations.forEach(m => {
+    const selectors = m.mutate();
+    const newNodes = _loadDOMNodes(selectors);
+    val = newNodes || val;
+  });
+  queueIfNeeded(val, record);
+}
+
 const getHTMLValue = (el: Element) => el.innerHTML;
@@ -117,2 +153,25 @@ const setHTMLValue = (el: Element, value: string) => (el.innerHTML = value);
 
+const getElementPosition = (el: Element): ElementPositionWithDomNode => {
+  return {
+    parentNode: el.parentElement as HTMLElement,
+    insertBeforeNode: el.nextElementSibling as HTMLElement | null,
+  };
+};
+const setElementPosition = (el: Element, value: ElementPositionWithDomNode) => {
+  value.parentNode.insertBefore(el, value.insertBeforeNode);
+};
+function getElementPositionRecord(element: Element): PositionRecord {
+  const elementRecord = getElementRecord(element);
+  if (!elementRecord.position) {
+    elementRecord.position = createElementPropertyRecord(
+      element,
+      'position',
+      getElementPosition,
+      setElementPosition,
+      positionMutationRunner
+    );
+  }
+  return elementRecord.position;
+}
+
 const setClassValue = (el: Element, val: string) =>
@@ -162,2 +221,5 @@ val ? (el.className = val) : el.removeAttribute('class');
     delete element.classes;
+  } else if (attr === 'position') {
+    element.position?.observer?.disconnect();
+    delete element.position;
   } else {
@@ -197,2 +259,3 @@ element.attributes?.[attr]?.observer?.disconnect();
   m.classes && setPropertyValue<ClassnameRecord>(el, 'class', m.classes);
+  m.position && setPropertyValue<PositionRecord>(el, 'position', m.position);
   Object.keys(m.attributes).forEach(attr => {
@@ -222,2 +285,4 @@ setPropertyValue<AttributeRecord>(el, attr, m.attributes[attr]);
     record = getElementAttributeRecord(element, mutation.attribute);
+  } else if (mutation.kind === 'position') {
+    record = getElementPositionRecord(element);
   }
@@ -238,2 +303,4 @@ if (!record) return;
     record = getElementAttributeRecord(el, mutation.attribute);
+  } else if (mutation.kind === 'position') {
+    record = getElementPositionRecord(el);
   }
@@ -330,2 +397,14 @@ if (!record) return;
 
+function position(
+  selector: PositionMutation['selector'],
+  mutate: PositionMutation['mutate']
+) {
+  return newMutation({
+    kind: 'position',
+    elements: new Set(),
+    mutate,
+    selector,
+  });
+}
+
 function classes(
@@ -376,2 +455,4 @@ selector: ClassnameMutation['selector'],
   attribute: attr,
+  parentSelector,
+  insertBeforeSelector,
 }: DeclarativeMutation): MutationController {
@@ -399,2 +480,9 @@ if (attr === 'html') {
     }
+  } else if (attr === 'position') {
+    if (action === 'set' && parentSelector) {
+      return position(selector, () => ({
+        insertBeforeSelector,
+        parentSelector,
+      }));
+    }
   } else {
@@ -423,2 +511,4 @@ if (action === 'append') {
   value?: string;
+  parentSelector?: string;
+  insertBeforeSelector?: string;
 };
@@ -430,3 +520,4 @@
   attribute,
+  position,
   declarative,
 };

src/types.ts

@@ -22,4 +22,24 @@ interface BaseMutation {
 
-type Mutation = HTMLMutation | ClassnameMutation | AttrMutation;
+interface PositionMutation extends BaseMutation {
+  kind: 'position';
+  mutate: () => ElementPosition;
+}
 
+interface ElementPosition {
+  parentSelector: string;
+  insertBeforeSelector?: null | string;
+}
+interface ElementPositionWithDomNode {
+  parentNode: HTMLElement;
+  insertBeforeNode: HTMLElement | null;
+}
+
+type Mutation =
+  | HTMLMutation
+  | ClassnameMutation
+  | AttrMutation
+  | PositionMutation;
+
+type MutationKind = Mutation['kind'];
+
 interface ElementPropertyRecord<T, V> {
@@ -40,2 +60,6 @@ observer: MutationObserver;
 type AttributeRecord = ElementPropertyRecord<AttrMutation, string | null>;
+type PositionRecord = ElementPropertyRecord<
+  PositionMutation,
+  ElementPositionWithDomNode
+>;
 
@@ -49,2 +73,3 @@ interface ElementRecord {
   };
+  position?: PositionRecord;
 }

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