mobx-state-tree - npm Package Compare versions

Comparing version 0.5.1 to 0.6.0

changelog.md

@@ -0,5 +1,15 @@
+# 0.6.0
+
+* **BREAKING** `types.withDefault` has been renamed to `types.optional`
+* **BREAKING** Array and map types can no longer be left out of snapshots by default. Use `optional` to make them optional in the snapshot
+* **BREAKING** Literals no longer have a default value by default (use optional + literal instead)
+* **BREAKING** Disabled inlining type.model definitions as introduced in 0.5.1; to many subtle issues
+* Improved identifier support, they are no properly propageted through utility types like `maybe`, `union` etc
+* Fixed issue where fields where not referted back to default when a partial snapshot was provided
+* Fixed #122: `types.identifier` now also accepts a subtype to override the default string type; e.g. `types.identifier(types.number)`
+
 # 0.5.1
 
 * Introduced support for lazy evaluating values in `withDefault`, useful to generate UUID's, timestamps or non-primitive default values
-* It is now possible to define something like
+* ~~It is now possible to define something like~~ Removed in 0.6.0
 
@@ -6,0 +16,0 @@ ```javascript

lib/core/mst-node-administration.js

@@ -126,2 +126,4 @@ "use strict";
         get: function () {
+            if (!this._isAlive)
+                return undefined;
             // advantage of using computed for a snapshot is that nicely respects transactions etc.
@@ -193,2 +195,3 @@ // Optimization: only freeze on dev builds
         // optimization: overload for a single old / new value to avoid all the array allocations
+        // optimization: skip reconciler for non-complex types
         var res = new Array(newValues.length);
@@ -200,2 +203,4 @@ var oldValuesByNode = {};
         oldValues.forEach(function (oldValue) {
+            if (!oldValue)
+                return;
             if (identifierAttribute) {
@@ -202,0 +207,0 @@ var id = oldValue[identifierAttribute];

lib/core/reference.js

@@ -61,7 +61,8 @@ "use strict";
             var target = mst_node_1.getMSTAdministration(value);
-            utils_1.invariant(base.root === target.root, "Failed to assign a value to a reference; the value should already be part of the same model tree");
             if (this.targetIdAttribute)
                 this.identifier = value[this.targetIdAttribute];
-            else
+            else {
+                utils_1.invariant(base.root === target.root, "Failed to assign a value to a reference; the value should already be part of the same model tree");
                 this.identifier = mst_node_1.getRelativePathForNodes(base, target);
+            }
         }
@@ -68,0 +69,0 @@ else if (this.targetIdAttribute) {

lib/types/complex-types/array.d.ts

@@ -24,4 +24,5 @@ import { IObservableArray, IArrayWillChange, IArrayWillSplice, IArrayChange, IArraySplice } from "mobx";
     removeChild(node: MSTAdministration, subpath: string): void;
+    readonly identifierAttribute: null;
 }
-export declare function createArrayFactory<S, T>(subtype: IType<S, T>): IComplexType<S[], IObservableArray<T>>;
+export declare function array<S, T>(subtype: IType<S, T>): IComplexType<S[], IObservableArray<T>>;
 export declare function isArrayFactory<S, T>(type: any): type is IComplexType<S[], IObservableArray<T>>;

lib/types/complex-types/array.js

@@ -24,3 +24,2 @@ "use strict";
 var complex_type_1 = require("./complex-type");
-var with_default_1 = require("../utility-types/with-default");
 function arrayToString() {
@@ -154,2 +153,9 @@ return core_1.getMSTAdministration(this) + "(" + this.length + " items)";
     };
+    Object.defineProperty(ArrayType.prototype, "identifierAttribute", {
+        get: function () {
+            return null;
+        },
+        enumerable: true,
+        configurable: true
+    });
     return ArrayType;
@@ -161,6 +167,6 @@ }(complex_type_1.ComplexType));
 exports.ArrayType = ArrayType;
-function createArrayFactory(subtype) {
-    return with_default_1.createDefaultValueFactory(new ArrayType(subtype.name + "[]", subtype), []);
+function array(subtype) {
+    return new ArrayType(subtype.name + "[]", subtype);
 }
-exports.createArrayFactory = createArrayFactory;
+exports.array = array;
 function isArrayFactory(type) {
@@ -167,0 +173,0 @@ return type_1.isType(type) && type.isArrayFactory === true;

lib/types/complex-types/complex-type.js

@@ -15,2 +15,6 @@ "use strict";
 var type_1 = require("../type");
+var utils_1 = require("../../utils");
+function toJSON() {
+    return mst_node_1.getMSTAdministration(this).snapshot;
+}
 /**
@@ -36,9 +40,20 @@ * A complex type produces a MST node (Node in the state tree)
         var node = new mst_node_administration_1.MSTAdministration(parent, subpath, instance, this, environment);
-        node.pseudoAction(function () {
-            _this.finalizeNewInstance(instance, snapshot);
-        });
-        node.fireHook("afterCreate");
-        if (parent)
-            node.fireHook("afterAttach");
-        return instance;
+        var sawException = true;
+        try {
+            node.pseudoAction(function () {
+                _this.finalizeNewInstance(instance, snapshot);
+            });
+            utils_1.addReadOnlyProp(instance, "toJSON", toJSON);
+            node.fireHook("afterCreate");
+            if (parent)
+                node.fireHook("afterAttach");
+            sawException = false;
+            return instance;
+        }
+        finally {
+            if (sawException) {
+                // short-cut to die the instance, to avoid the snapshot computed starting to throw...
+                node._isAlive = false;
+            }
+        }
     };
@@ -45,0 +60,0 @@ ComplexType.prototype.is = function (value) {

lib/types/complex-types/map.d.ts

@@ -29,4 +29,5 @@ import { ObservableMap, IMapChange, IMapWillChange } from "mobx";
     removeChild(node: MSTAdministration, subpath: string): void;
+    readonly identifierAttribute: null;
 }
-export declare function createMapFactory<S, T>(subtype: IType<S, T>): IComplexType<{
+export declare function map<S, T>(subtype: IType<S, T>): IComplexType<{
     [key: string]: S;
@@ -33,0 +34,0 @@ }, IExtendedObservableMap<T>>;

lib/types/complex-types/map.js

@@ -19,3 +19,2 @@ "use strict";
 Object.defineProperty(exports, "__esModule", { value: true });
-var with_default_1 = require("../utility-types/with-default");
 var object_1 = require("./object");
@@ -50,3 +49,3 @@ var mobx_1 = require("mobx");
     MapType.prototype.createNewInstance = function () {
-        var identifierAttr = object_1.getIdentifierAttribute(this.subType);
+        // const identifierAttr = getIdentifierAttribute(this.subType)
         var map = mobx_1.observable.shallowMap();
@@ -80,3 +79,3 @@ utils_1.addHiddenFinalProp(map, "put", put);
         // Q: how to create a map that is not keyed by identifier, but contains objects with identifiers? Is that a use case? A: No, that is were reference maps should come into play...
-        var identifierAttr = object_1.getIdentifierAttribute(node);
+        var identifierAttr = object_1.getIdentifierAttribute(node.type);
         if (identifierAttr && change.newValue && typeof change.newValue === "object" && change.newValue[identifierAttr] !== change.name)
@@ -191,2 +190,9 @@ utils_1.fail("A map of objects containing an identifier should always store the object under their own identifier. Trying to store key '" + change.name + "', but expected: '" + change.newValue[identifierAttr] + "'");
     };
+    Object.defineProperty(MapType.prototype, "identifierAttribute", {
+        get: function () {
+            return null;
+        },
+        enumerable: true,
+        configurable: true
+    });
     return MapType;
@@ -198,6 +204,6 @@ }(complex_type_1.ComplexType));
 exports.MapType = MapType;
-function createMapFactory(subtype) {
-    return with_default_1.createDefaultValueFactory(new MapType("map<string, " + subtype.name + ">", subtype), {});
+function map(subtype) {
+    return new MapType("map<string, " + subtype.name + ">", subtype);
 }
-exports.createMapFactory = createMapFactory;
+exports.map = map;
 function isMapFactory(factory) {
@@ -204,0 +210,0 @@ return type_1.isType(factory) && factory.isMapFactory === true;

lib/types/complex-types/object.d.ts

@@ -44,6 +44,6 @@ import { IObjectChange, IObjectWillChange } from "mobx";
 }
-export declare function createModelFactory<T>(properties: IModelProperties<T> & ThisType<T>): IModelType<T, {}>;
-export declare function createModelFactory<T>(name: string, properties: IModelProperties<T> & ThisType<T>): IModelType<T, {}>;
-export declare function createModelFactory<T, A>(properties: IModelProperties<T> & ThisType<T>, operations: A & ThisType<T & A>): IModelType<T, A>;
-export declare function createModelFactory<T, A>(name: string, properties: IModelProperties<T> & ThisType<T>, operations: A & ThisType<T & A>): IModelType<T, A>;
+export declare function model<T>(properties: IModelProperties<T> & ThisType<T>): IModelType<T, {}>;
+export declare function model<T>(name: string, properties: IModelProperties<T> & ThisType<T>): IModelType<T, {}>;
+export declare function model<T, A>(properties: IModelProperties<T> & ThisType<T>, operations: A & ThisType<T & A>): IModelType<T, A>;
+export declare function model<T, A>(name: string, properties: IModelProperties<T> & ThisType<T>, operations: A & ThisType<T & A>): IModelType<T, A>;
 export declare function extend<A, B, AA, BA>(name: string, a: IModelType<A, AA>, b: IModelType<B, BA>): IModelType<A & B, AA & BA>;
@@ -54,2 +54,2 @@ export declare function extend<A, B, C, AA, BA, CA>(name: string, a: IModelType<A, AA>, b: IModelType<B, BA>, c: IModelType<C, CA>): IModelType<A & B & C, AA & BA & CA>;
 export declare function isObjectFactory(type: any): boolean;
-export declare function getIdentifierAttribute(factory: any): string | null;
+export declare function getIdentifierAttribute(type: IType<any, any>): string | null;

lib/types/complex-types/object.js

@@ -25,3 +25,3 @@ "use strict";
 var primitives_1 = require("../primitives");
-var with_default_1 = require("../utility-types/with-default");
+var optional_1 = require("../utility-types/optional");
 var reference_1 = require("../utility-types/reference");
@@ -80,3 +80,3 @@ var identifier_1 = require("../utility-types/identifier");
         var _a = this, baseModel = _a.baseModel, baseActions = _a.baseActions;
-        var _loop_1 = function (key) {
+        for (var key in baseModel)
             if (utils_1.hasOwnProperty(baseModel, key)) {
@@ -86,35 +86,38 @@ // TODO: check that hooks are not defined as part of baseModel
                 if ("get" in descriptor) {
-                    this_1.props[key] = new computed_property_1.ComputedProperty(key, descriptor.get, descriptor.set);
-                    return "continue";
+                    this.props[key] = new computed_property_1.ComputedProperty(key, descriptor.get, descriptor.set);
+                    continue;
                 }
-                var value_1 = descriptor.value;
-                if (value_1 === null || undefined) {
+                var value = descriptor.value;
+                if (value === null || undefined) {
                     utils_1.fail("The default value of an attribute cannot be null or undefined as the type cannot be inferred. Did you mean `types.maybe(someType)`?");
                 }
-                else if (identifier_1.isIdentifierFactory(value_1)) {
-                    utils_1.invariant(!this_1.identifierAttribute, "Cannot define property '" + key + "' as object identifier, property '" + this_1.identifierAttribute + "' is already defined as identifier property");
-                    this_1.identifierAttribute = key;
-                    this_1.props[key] = new identifier_property_1.IdentifierProperty(key);
+                else if (identifier_1.isIdentifierFactory(value)) {
+                    utils_1.invariant(!this.identifierAttribute, "Cannot define property '" + key + "' as object identifier, property '" + this.identifierAttribute + "' is already defined as identifier property");
+                    this.identifierAttribute = key;
+                    this.props[key] = new identifier_property_1.IdentifierProperty(key, value.primitiveType);
                 }
-                else if (utils_1.isPrimitive(value_1)) {
-                    var baseType = primitives_1.getPrimitiveFactoryFromValue(value_1);
-                    this_1.props[key] = new value_property_1.ValueProperty(key, with_default_1.createDefaultValueFactory(baseType, value_1));
+                else if (utils_1.isPrimitive(value)) {
+                    var baseType = primitives_1.getPrimitiveFactoryFromValue(value);
+                    this.props[key] = new value_property_1.ValueProperty(key, optional_1.optional(baseType, value));
                 }
-                else if (type_1.isType(value_1)) {
-                    this_1.props[key] = new value_property_1.ValueProperty(key, value_1);
+                else if (type_1.isType(value)) {
+                    this.props[key] = new value_property_1.ValueProperty(key, value);
                 }
-                else if (reference_1.isReferenceFactory(value_1)) {
-                    this_1.props[key] = new reference_property_1.ReferenceProperty(key, value_1.targetType, value_1.basePath);
+                else if (reference_1.isReferenceFactory(value)) {
+                    this.props[key] = new reference_property_1.ReferenceProperty(key, value.targetType, value.basePath);
                 }
-                else if (typeof value_1 === "function") {
-                    this_1.props[key] = new view_property_1.ViewProperty(key, value_1);
+                else if (typeof value === "function") {
+                    this.props[key] = new view_property_1.ViewProperty(key, value);
                 }
-                else if (typeof value_1 === "object") {
-                    if (!Array.isArray(value_1) && utils_1.isPlainObject(value_1)) {
-                        this_1.props[key] = new value_property_1.ValueProperty(key, with_default_1.createDefaultValueFactory(createModelFactory(this_1.name + "__" + key, value_1), function () { return value_1; }));
-                    }
-                    else {
-                        // TODO: in future also expand on `[Type]` and  `[{ x: 3 }]`
-                        utils_1.fail("In property '" + key + "': base model's should not contain complex values: '" + value_1 + "'");
-                    }
+                else if (typeof value === "object") {
+                    // if (!Array.isArray(value) && isPlainObject(value)) {
+                    //     TODO: also check if the entire type is simple! (no identifiers and other complex types)
+                    //     this.props[key] = new ValueProperty(key, createDefaultValueFactory(
+                    //         createModelFactory(this.name + "__" + key, value),
+                    //         () => value)
+                    //     )
+                    // } else {
+                    // TODO: in future also expand on `[Type]` and  `[{ x: 3 }]`
+                    utils_1.fail("In property '" + key + "': base model's should not contain complex values: '" + value + "'");
+                    // }
                 }
@@ -125,7 +128,2 @@ else {
             }
-        };
-        var this_1 = this;
-        for (var key in baseModel) {
-            _loop_1(key);
-        }
         for (var key in baseActions)
@@ -162,6 +160,3 @@ if (utils_1.hasOwnProperty(baseActions, key)) {
         utils_1.invariant(patch.op === "replace" || patch.op === "add");
-        this.applySnapshot(node, (_a = {},
-            _a[subpath] = patch.value,
-            _a));
-        var _a;
+        node.target[subpath] = patch.value;
     };
@@ -172,6 +167,4 @@ ObjectType.prototype.applySnapshot = function (node, snapshot) {
         node.pseudoAction(function () {
-            for (var key in snapshot)
-                if (key in _this.props) {
-                    _this.props[key].deserialize(node.target, snapshot);
-                }
+            for (var key in _this.props)
+                _this.props[key].deserialize(node.target, snapshot);
         });
@@ -220,3 +213,3 @@ };
 exports.ObjectType = ObjectType;
-function createModelFactory(arg1, arg2, arg3) {
+function model(arg1, arg2, arg3) {
     var name = typeof arg1 === "string" ? arg1 : "AnonymousModel";
@@ -227,3 +220,3 @@ var baseModel = typeof arg1 === "string" ? arg2 : arg1;
 }
-exports.createModelFactory = createModelFactory;
+exports.model = model;
 function getObjectFactoryBaseModel(item) {
@@ -241,3 +234,3 @@ var type = type_1.isType(item) ? item : core_1.getType(item);
     var factoryName = typeof args[0] === "string" ? args[0] : baseFactories.map(function (f) { return f.name; }).join("_");
-    return createModelFactory(factoryName, utils_1.extend.apply(null, [{}].concat(baseFactories.map(getObjectFactoryBaseModel))));
+    return model(factoryName, utils_1.extend.apply(null, [{}].concat(baseFactories.map(getObjectFactoryBaseModel))));
 }
@@ -249,6 +242,9 @@ exports.extend = extend;
 exports.isObjectFactory = isObjectFactory;
-function getIdentifierAttribute(factory) {
-    return isObjectFactory(factory) ? factory.identifierAttribute : null;
+function getIdentifierAttribute(type) {
+    // TODO: this should be a general property of types
+    if (type instanceof ObjectType)
+        return type.identifierAttribute;
+    return null;
 }
 exports.getIdentifierAttribute = getIdentifierAttribute;
 //# sourceMappingURL=object.js.map

lib/types/index.d.ts

 import { IObservableArray } from "mobx";
-import { IType, ISimpleType } from "./type";
+import { IType, ISimpleType, IComplexType } from "./type";
 import { IExtendedObservableMap } from "./complex-types/map";
@@ -37,3 +37,3 @@ import { IModelType } from "./complex-types/object";
     };
-    withDefault: {
+    optional: {
         <S, T>(type: IType<S, T>, defaultValueOrFunction: S): IType<S, T>;
@@ -54,8 +54,11 @@ <S, T>(type: IType<S, T>, defaultValueOrFunction: T): IType<S, T>;
     Date: ISimpleType<Date>;
-    map: <S, T>(subFactory: IType<S, T>) => IType<{
+    map: <S, T>(subtype: IType<S, T>) => IComplexType<{
         [key: string]: S;
     }, IExtendedObservableMap<T>>;
-    array: <S, T>(subFactory: IType<S, T>) => IType<T[], IObservableArray<T>>;
+    array: <S, T>(subtype: IType<S, T>) => IComplexType<S[], IObservableArray<T>>;
     frozen: ISimpleType<any>;
-    identifier: () => string;
+    identifier: {
+        <T>(baseType: IType<T, T>): T;
+        (): string;
+    };
     late: {
@@ -62,0 +65,0 @@ <S, T>(type: () => IType<S, T>): IType<S, T>;

lib/types/index.js

 "use strict";
 Object.defineProperty(exports, "__esModule", { value: true });
+// tslint:disable-next-line:no_unused-variable
 var map_1 = require("./complex-types/map");
@@ -10,3 +11,3 @@ var array_1 = require("./complex-types/array");
 var union_1 = require("./utility-types/union");
-var with_default_1 = require("./utility-types/with-default");
+var optional_1 = require("./utility-types/optional");
 var literal_1 = require("./utility-types/literal");
@@ -18,31 +19,11 @@ var maybe_1 = require("./utility-types/maybe");
 var late_1 = require("./utility-types/late");
-/**
- *
- *
- * @export
- * @param {ModelFactory} [subFactory=primitiveFactory]
- * @returns
- */
-function map(subFactory) {
-    return map_1.createMapFactory(subFactory);
-}
-/**
- *
- *
- * @export
- * @param {ModelFactory} [subFactory=primitiveFactory]
- * @returns
- */
-function array(subFactory) {
-    return array_1.createArrayFactory(subFactory);
-}
 exports.types = {
-    model: object_1.createModelFactory,
+    model: object_1.model,
     extend: object_1.extend,
     reference: reference_1.reference,
-    union: union_1.createUnionFactory,
-    withDefault: with_default_1.createDefaultValueFactory,
-    literal: literal_1.createLiteralFactory,
-    maybe: maybe_1.createMaybeFactory,
-    refinement: refinement_1.createRefinementFactory,
+    union: union_1.union,
+    optional: optional_1.optional,
+    literal: literal_1.literal,
+    maybe: maybe_1.maybe,
+    refinement: refinement_1.refinement,
     string: primitives_1.string,
@@ -52,4 +33,4 @@ boolean: primitives_1.boolean,
     Date: primitives_1.DatePrimitive,
-    map: map,
-    array: array,
+    map: map_1.map,
+    array: array_1.array,
     frozen: frozen_1.frozen,
@@ -56,0 +37,0 @@ identifier: identifier_1.identifier,

lib/types/primitives.d.ts

@@ -8,2 +8,3 @@ import { ISimpleType, Type } from "./type";
     is(thing: any): thing is T;
+    readonly identifierAttribute: null;
 }
@@ -10,0 +11,0 @@ export declare const string: ISimpleType<string>;

lib/types/primitives.js

@@ -33,2 +33,9 @@ "use strict";
     };
+    Object.defineProperty(CoreType.prototype, "identifierAttribute", {
+        get: function () {
+            return null;
+        },
+        enumerable: true,
+        configurable: true
+    });
     return CoreType;
@@ -35,0 +42,0 @@ }(type_1.Type));

lib/types/property-types/identifier-property.d.ts

 import { IObjectWillChange } from "mobx";
 import { Property } from "./property";
+import { IType } from "../type";
 export declare class IdentifierProperty extends Property {
-    constructor(propertyName: string);
+    subtype: IType<any, any>;
+    constructor(propertyName: string, subtype: IType<any, any>);
     initialize(target: any, snapshot: any): void;
@@ -10,2 +12,3 @@ willChange(change: IObjectWillChange): IObjectWillChange | null;
     isValidSnapshot(snapshot: any): boolean;
+    isValidIdentifier(identifier: any): boolean;
 }

lib/types/property-types/identifier-property.js

@@ -17,6 +17,9 @@ "use strict";
 var utils_1 = require("../../utils");
+var type_1 = require("../type");
 var IdentifierProperty = (function (_super) {
     __extends(IdentifierProperty, _super);
-    function IdentifierProperty(propertyName) {
-        return _super.call(this, propertyName) || this;
+    function IdentifierProperty(propertyName, subtype) {
+        var _this = _super.call(this, propertyName) || this;
+        _this.subtype = subtype;
+        return _this;
     }
@@ -30,15 +33,18 @@ IdentifierProperty.prototype.initialize = function (target, snapshot) {
     IdentifierProperty.prototype.willChange = function (change) {
-        if (!utils_1.isValidIdentifier(change.newValue))
-            utils_1.fail("Not a valid identifier: '" + change.newValue);
+        var identifier = change.newValue;
+        if (typeof identifier !== "number" && !utils_1.isValidIdentifier(identifier))
+            utils_1.fail("Not a valid identifier: '" + identifier);
+        type_1.typecheck(this.subtype, identifier);
         var node = core_1.getMSTAdministration(change.object);
         node.assertWritable();
         var oldValue = change.object[this.name];
-        if (oldValue !== undefined && oldValue !== change.newValue)
-            utils_1.fail("It is not allowed to change the identifier of an object, got: '" + change.newValue + "' but expected: '" + oldValue + "'");
+        if (oldValue !== undefined && oldValue !== identifier)
+            utils_1.fail("It is not allowed to change the identifier of an object, got: '" + identifier + "' but expected: '" + oldValue + "'");
         return change;
     };
     IdentifierProperty.prototype.serialize = function (instance, snapshot) {
-        if (!utils_1.isValidIdentifier(instance[this.name]))
-            utils_1.fail("Object does not have a valid identifier yet: '" + instance[this.name] + "'");
-        snapshot[this.name] = instance[this.name];
+        var identifier = instance[this.name];
+        if (!this.isValidIdentifier(identifier))
+            utils_1.fail("Object does not have a valid identifier yet: '" + identifier + "'");
+        snapshot[this.name] = identifier;
     };
@@ -49,4 +55,9 @@ IdentifierProperty.prototype.deserialize = function (instance, snapshot) {
     IdentifierProperty.prototype.isValidSnapshot = function (snapshot) {
-        return utils_1.isValidIdentifier(snapshot[this.name]);
+        return this.isValidIdentifier(snapshot[this.name]);
     };
+    IdentifierProperty.prototype.isValidIdentifier = function (identifier) {
+        if (typeof identifier !== "number" && !utils_1.isValidIdentifier(identifier))
+            return false;
+        return this.subtype.is(identifier);
+    };
     return IdentifierProperty;
@@ -53,0 +64,0 @@ }(property_1.Property));

lib/types/type.d.ts

@@ -11,2 +11,3 @@ export interface ISnapshottable<S> {
     SnapshotType: S;
+    identifierAttribute: string | null;
 }
@@ -27,4 +28,5 @@ export interface ISimpleType<T> extends IType<T, T> {
     readonly SnapshotType: S;
+    readonly abstract identifierAttribute: string | null;
 }
 export declare function typecheck(type: IType<any, any>, value: any): void;
 import { IMSTNode } from "../core/mst-node";

lib/types/type.js

@@ -34,3 +34,3 @@ "use strict";
         utils_1.fail("Value" + currentTypename + " '" + (utils_1.isSerializable(value) ? JSON.stringify(value) : value) + "' is not assignable to type: " + type.name +
-            (primitives_1.isPrimitiveType(type) || (type instanceof with_default_1.DefaultValue && primitives_1.isPrimitiveType(type.type))
+            (primitives_1.isPrimitiveType(type) || (type instanceof optional_1.OptionalValue && primitives_1.isPrimitiveType(type.type))
                 ? "."
@@ -45,3 +45,3 @@ : (", expected an instance of " + type.name + " or a snapshot like '" + type.describe() + "' instead." +
 var primitives_1 = require("./primitives");
-var with_default_1 = require("./utility-types/with-default");
+var optional_1 = require("./utility-types/optional");
 //# sourceMappingURL=type.js.map

lib/types/utility-types/frozen.d.ts

@@ -7,3 +7,4 @@ import { ISimpleType, Type } from "../type";
     is(value: any): value is T;
+    readonly identifierAttribute: null;
 }
 export declare const frozen: ISimpleType<any>;

lib/types/utility-types/frozen.js

@@ -42,2 +42,9 @@ "use strict";
     };
+    Object.defineProperty(Frozen.prototype, "identifierAttribute", {
+        get: function () {
+            return null;
+        },
+        enumerable: true,
+        configurable: true
+    });
     return Frozen;
@@ -44,0 +51,0 @@ }(type_1.Type));

lib/types/utility-types/identifier.d.ts

@@ -1,5 +0,8 @@
-export interface IIdentifierDescriptor {
+import { IType } from "../type";
+export interface IIdentifierDescriptor<T> {
     isIdentifier: true;
+    primitiveType: IType<T, T>;
 }
+export declare function identifier<T>(baseType: IType<T, T>): T;
 export declare function identifier(): string;
-export declare function isIdentifierFactory(thing: any): thing is IIdentifierDescriptor;
+export declare function isIdentifierFactory(thing: any): thing is IIdentifierDescriptor<any>;

lib/types/utility-types/identifier.js

 "use strict";
 Object.defineProperty(exports, "__esModule", { value: true });
-// TODO: properly turn this into a factory, that reuses `types.string`?
-// See: https://github.com/mobxjs/mobx-state-tree/pull/65#issuecomment-289603441
-// todo: change to const `types.identifier`
-function identifier() {
+var primitives_1 = require("../primitives");
+var utils_1 = require("../../utils");
+function identifier(baseType) {
+    if (baseType === void 0) { baseType = primitives_1.string; }
+    if (baseType !== primitives_1.string && baseType !== primitives_1.number)
+        utils_1.fail("Only 'types.number' and 'types.string' are acceptable as type specification for identifiers");
     return {
-        isIdentifier: true
+        isIdentifier: true,
+        primitiveType: baseType
     };
@@ -10,0 +13,0 @@ }

lib/types/utility-types/late.d.ts

@@ -10,2 +10,3 @@ import { Type, IType } from "../type";
     is(value: any): value is T;
+    readonly identifierAttribute: string | null;
 }
@@ -12,0 +13,0 @@ export declare type ILateType<S, T> = () => IType<S, T>;

lib/types/utility-types/late.js

@@ -43,2 +43,9 @@ "use strict";
     };
+    Object.defineProperty(Late.prototype, "identifierAttribute", {
+        get: function () {
+            return this.subType.identifierAttribute;
+        },
+        enumerable: true,
+        configurable: true
+    });
     return Late;
@@ -45,0 +52,0 @@ }(type_1.Type));

lib/types/utility-types/literal.d.ts

@@ -5,6 +5,7 @@ import { ISimpleType, Type } from "../type";
     constructor(value: any);
-    create(): any;
+    create(snapshot: any): any;
     describe(): string;
     is(value: any): value is T;
+    readonly identifierAttribute: null;
 }
-export declare function createLiteralFactory<S>(value: S): ISimpleType<S>;
+export declare function literal<S>(value: S): ISimpleType<S>;

lib/types/utility-types/literal.js

@@ -13,3 +13,2 @@ "use strict";
 Object.defineProperty(exports, "__esModule", { value: true });
-var with_default_1 = require("./with-default");
 var type_1 = require("../type");
@@ -24,3 +23,4 @@ var utils_1 = require("../../utils");
     }
-    Literal.prototype.create = function () {
+    Literal.prototype.create = function (snapshot) {
+        type_1.typecheck(this, snapshot);
         return this.value;
@@ -34,10 +34,17 @@ };
     };
+    Object.defineProperty(Literal.prototype, "identifierAttribute", {
+        get: function () {
+            return null;
+        },
+        enumerable: true,
+        configurable: true
+    });
     return Literal;
 }(type_1.Type));
 exports.Literal = Literal;
-function createLiteralFactory(value) {
+function literal(value) {
     utils_1.invariant(utils_1.isPrimitive(value), "Literal types can be built only on top of primitives");
-    return with_default_1.createDefaultValueFactory(new Literal(value), value);
+    return new Literal(value);
 }
-exports.createLiteralFactory = createLiteralFactory;
+exports.literal = literal;
 //# sourceMappingURL=literal.js.map

lib/types/utility-types/maybe.d.ts

 import { IType } from "../type";
-export declare function createMaybeFactory<S, T>(type: IType<S, T>): IType<S | null | undefined, T | null>;
+export declare function maybe<S, T>(type: IType<S, T>): IType<S | null | undefined, T | null>;

lib/types/utility-types/maybe.js

@@ -5,7 +5,9 @@ "use strict";
 var literal_1 = require("./literal");
-var nullFactory = literal_1.createLiteralFactory(null);
-function createMaybeFactory(type) {
-    return union_1.createUnionFactory(nullFactory, type);
+var optional_1 = require("./optional");
+var nullType = optional_1.optional(literal_1.literal(null), null);
+function maybe(type) {
+    // TODO: is identifierAttr correct for maybe?
+    return union_1.union(nullType, type);
 }
-exports.createMaybeFactory = createMaybeFactory;
+exports.maybe = maybe;
 //# sourceMappingURL=maybe.js.map

lib/types/utility-types/refinement.d.ts

@@ -9,4 +9,5 @@ import { IType, Type } from "../type";
     is(value: any): value is any;
+    readonly identifierAttribute: string | null;
 }
-export declare function createRefinementFactory<T>(name: string, type: IType<T, T>, predicate: (snapshot: T) => boolean): IType<T, T>;
-export declare function createRefinementFactory<S, T extends S, U extends S>(name: string, type: IType<S, T>, predicate: (snapshot: S) => snapshot is U): IType<S, U>;
+export declare function refinement<T>(name: string, type: IType<T, T>, predicate: (snapshot: T) => boolean): IType<T, T>;
+export declare function refinement<S, T extends S, U extends S>(name: string, type: IType<S, T>, predicate: (snapshot: S) => snapshot is U): IType<S, U>;

lib/types/utility-types/refinement.js

@@ -38,6 +38,13 @@ "use strict";
     };
+    Object.defineProperty(Refinement.prototype, "identifierAttribute", {
+        get: function () {
+            return this.type.identifierAttribute;
+        },
+        enumerable: true,
+        configurable: true
+    });
     return Refinement;
 }(type_1.Type));
 exports.Refinement = Refinement;
-function createRefinementFactory(name, type, predicate) {
+function refinement(name, type, predicate) {
     // check if the subtype default value passes the predicate
@@ -48,3 +55,3 @@ var inst = type.create();
 }
-exports.createRefinementFactory = createRefinementFactory;
+exports.refinement = refinement;
 //# sourceMappingURL=refinement.js.map

lib/types/utility-types/union.d.ts

@@ -10,4 +10,5 @@ import { IType, Type } from "../type";
     is(value: any): value is any;
+    readonly identifierAttribute: string | null;
 }
-export declare function createUnionFactory<SA, SB, TA, TB>(dispatch: ITypeDispatcher, A: IType<SA, TA>, B: IType<SB, TB>): IType<SA | SB, TA | TB>;
-export declare function createUnionFactory<SA, SB, TA, TB>(A: IType<SA, TA>, B: IType<SB, TB>): IType<SA | SB, TA | TB>;
+export declare function union<SA, SB, TA, TB>(dispatch: ITypeDispatcher, A: IType<SA, TA>, B: IType<SB, TB>): IType<SA | SB, TA | TB>;
+export declare function union<SA, SB, TA, TB>(A: IType<SA, TA>, B: IType<SB, TB>): IType<SA | SB, TA | TB>;

lib/types/utility-types/union.js

@@ -42,6 +42,16 @@ "use strict";
     };
+    Object.defineProperty(Union.prototype, "identifierAttribute", {
+        get: function () {
+            var identifier0 = this.types[0].identifierAttribute;
+            if (identifier0 && this.types.every(function (type) { return type.identifierAttribute === identifier0; }))
+                return identifier0;
+            return null;
+        },
+        enumerable: true,
+        configurable: true
+    });
     return Union;
 }(type_1.Type));
 exports.Union = Union;
-function createUnionFactory(dispatchOrType) {
+function union(dispatchOrType) {
     var otherTypes = [];
@@ -56,3 +66,3 @@ for (var _i = 1; _i < arguments.length; _i++) {
 }
-exports.createUnionFactory = createUnionFactory;
+exports.union = union;
 //# sourceMappingURL=union.js.map

mobx-state-tree.umd.js

@@ -1,2 +0,2 @@
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package.json

 {
   "name": "mobx-state-tree",
-  "version": "0.5.1",
+  "version": "0.6.0",
   "description": "Opinionated, transactional, MobX powered state container",
@@ -13,3 +13,3 @@ "main": "lib/index.js",
     "test": "npm run build-tests && ava",
-    "watch": "concurrently --kill-others --names 'build-tests,test-runner' 'tsc --watch -p test' --raw  'ava --watch'",
+    "watch": "tsc -p test && concurrently --kill-others --names 'build-tests,test-runner' 'tsc --watch -p test' --raw  'ava --watch'",
     "_prepublish": "npm run build && npm run build-docs",
@@ -16,0 +16,0 @@ "coverage": "npm run build-tests && nyc ava && nyc report -r html && nyc report -r lcov",

README.md

 # mobx-state-tree
 
-## _This package is work in progress, stay tuned_
-
 _Opinionated, transactional, MobX powered state container_
@@ -14,37 +12,62 @@
 
-An introduction to the philosophy can be watched [here](https://youtu.be/ta8QKmNRXZM?t=21m52s). [Slides](https://immer-mutable-state.surge.sh/). Or, as [markdown](https://github.com/mweststrate/reactive2016-slides/blob/master/slides.md) to read it quickly.
-
 # Installation
 
-NPM:
+* NPM: `npm install mobx-state-tree --save`
+* Yarn: `yarn add mobx-state-tree`
+* CDN: https://unpkg.com/mobx-state-tree/mobx-state-tree.umd.js (exposed as `window.mobxStateTree`)
+* JSBin [playground](http://jsbin.com/petoxeheta/edit?html,js,console) (without UI)
 
-npm install mobx-state-tree --save-dev
+# Philosophy
 
-CDN:
+`mobx-state-tree` is a state container that combines the _simplicity and ease of mutable data_ with the _traceability of immutable data_ and the _reactiveness and performance of observable data_.
 
-<https://unpkg.com/mobx-state-tree/mobx-state-tree.umd.js>
+Put simply, mobx-state-tree tries to combine the best features of both immutability (transactionality, traceability and composition) and mutability (discoverability, co-location and encapsulation) based approaches to state management; everything to provide the best developer experience possible.
+Unlike MobX itself, mobx-state-tree is very opinionated on how data should be structured and updated.
+This makes it possible to solve many common problems out of the box.
 
-# Philosophy
+Central in MST (mobx-state-tree) is the concept of a *living tree*. The tree consists of mutable, but strictly protected objects enriched with _runtime type information_.
+From this living tree, (structurally shared) snapshots are generated automatically.
 
-`mobx-state-tree` is a state container that combines the _simplicity and ease of mutable data_ with the _traceability of immutable data_ and the _reactiveness and performance of observable data_.
+(example)
 
-It is an opt-in state container that can be used in MobX, but also Redux based applications.
+By using the type information available; snapshots can be converted to living trees and vice versa with zero effort.
+Because of this, [time travelling](https://github.com/mobxjs/mobx-state-tree/blob/master/examples/boxes/src/stores/time.js) is supported out of the box, and tools like HMR are trivial to support.
 
-If MobX is like a spreadsheet mechanism for javascript, then mobx-state-tree is like storing your spreadsheet in git.
+(example)
 
-Unlike MobX itself, mobx-state-tree is quite opinionated on how you structure your data.
-This makes it possible to solve many problems generically and out of the box, like:
+The type information is designed in such a way that it is used both at design- and run-time to verify type correctness (Design time type checking is TypeScript only atm, Flow PR's are welcome!)
 
--   (De-) serialization
--   Snapshotting state
--   Replaying actions
--   Time travelling
--   Emitting and applying JSON patches
--   Protecting state against uncontrolled mutations
--   Using middleware
--   Using dependency injection
--   Maintaining invariants
+(screenshot)
 
-`mobx-state-tree` tries to take the best features from both object oriented (discoverability, co-location and encapsulation), and immutable based state management approaches (transactionality, sharing functionality through composition).
+Because state trees are living, mutable models actions are straight-forward to write.
 
+(Example)
+
+But fear not; actions have many interesting properties.
+By default trees cannot only be modified by using an action that belongs to the same subtree.
+Furthermore actions are replayable and can be used as means to distribute changes ([example](https://github.com/mobxjs/mobx-state-tree/blob/master/examples/boxes/src/stores/socket.js)).
+
+Moreover; since changes can be detected on a fine grained level. JSON patches are supported out of the box.
+Simply subscribing to the patch stream of a tree is another way to sync diffs with for example back-end servers or other clients ([example](https://github.com/mobxjs/mobx-state-tree/blob/master/examples/boxes/src/stores/socket.js)).
+
+Since MST uses MobX behind the scenes, it integrates seamlessly with [mobx](todo) and [mobx-react](todo). But even cooler; because it supports snapshots, middleware and replayable actions out of the box. It is even possible to replace a Redux store and reducer with a MobX state tree. This makes it even possible to connect the Redux devtools to MST. See the [Redux / MST TodoMVC example](todo).
+
+Finally, MST has built-in support for references, identifiers, dependency injection, change recording and circular type definitions (even across files).
+Even fancier; it analyses liveleness of objects, failing early when you try to access accidentally cached information! (More on that later)
+
+Despite all that, you will see that the [API](api.md) is pretty straight forward!
+
+---
+
+Another way to look at mobx-state-tree is to consider it, as argued by Daniel Earwicker, to be ["React, but for data"](http://danielearwicker.github.io/json_mobx_Like_React_but_for_Data_Part_2_.html).
+Like React, MST consists of composable components, called *models*, which capture a small piece of state. They are instantiated from props (snapshots) and after that manage and protect their own internal state (using actions). Moreover, when applying snapshots, tree nodes are reconciled as much as possible. There is even a context-like mechanism, called environments, to pass information to deep descendants.
+
+An introduction to the philosophy can be watched [here](https://youtu.be/ta8QKmNRXZM?t=21m52s). [Slides](https://immer-mutable-state.surge.sh/). Or, as [markdown](https://github.com/mweststrate/reactive2016-slides/blob/master/slides.md) to read it quickly.
+
+TODO: react europe talk
+
+# Examples
+
+TODO: move https://github.com/mweststrate/react-mobx-shop/tree/mobx-state-tree to this repo
+
 # Concepts
@@ -51,0 +74,0 @@

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