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mobx-state-tree - npm Package Compare versions

Comparing version 0.6.0 to 0.6.1

lib/types/type-checker.d.ts
lib/types/type-checker.js
lib/types/type-checker.js.map

10

changelog.md

@@ -0,1 +1,11 @@

# 0.6.1
* Improved reporting of Type.is(), now it returns a fine grained report of why the provided value is not applicable.
```
[mobx-state-tree] Error while converting [{}] to AnonymousModel[]:
at path "/name" snapshot undefined is not assignable to type: string.
at path "/quantity" snapshot undefined is not assignable to type: number.
```
* Fixed support for `types.reference` in combination with `types.late`, by @robinfehr
# 0.6.0

@@ -2,0 +12,0 @@

12

lib/core/mst-node-administration.js

@@ -10,3 +10,3 @@ "use strict";

var mobx_1 = require("mobx");
var type_1 = require("../types/type");
var type_checker_1 = require("../types/type-checker");
var mst_node_1 = require("./mst-node");

@@ -40,2 +40,6 @@ var utils_1 = require("../utils");

this._environment = environment;
// optimization: don't keep the snapshot by default alive with a reaction by default
// in prod mode. This saves lot of GC overhead (important for e.g. React Native)
// if the feature is not actively used
// downside; no structural sharing if getSnapshot is called incidently
var snapshotDisposer = mobx_1.reaction(function () { return _this.snapshot; }, function (snapshot) {

@@ -141,3 +145,3 @@ _this.snapshotSubscribers.forEach(function (f) { return f(snapshot); });

MSTAdministration.prototype.applySnapshot = function (snapshot) {
type_1.typecheck(this.type, snapshot);
type_checker_1.typecheck(this.type, snapshot);
return this.type.applySnapshot(this, snapshot);

@@ -229,3 +233,3 @@ };

else if (identifierAttribute && utils_1.isMutable(newValue)) {
type_1.typecheck(childType, newValue);
type_checker_1.typecheck(childType, newValue);
// Try to reconcile based on id

@@ -246,3 +250,3 @@ var id = newValue[identifierAttribute];

else {
type_1.typecheck(childType, newValue);
type_checker_1.typecheck(childType, newValue);
// create a fresh MST node

@@ -249,0 +253,0 @@ res[index] = childType.create(newValue, undefined, _this, subPath); // any -> we don't want this typing public

3

lib/core/mst-operations.d.ts

@@ -86,3 +86,3 @@ import { IRawActionCall, ISerializedActionCall } from "./action";

* Applies a number of JSON patches in a single MobX transaction
*
* TODO: merge with applyPatch
* @export

@@ -101,2 +101,3 @@ * @param {Object} target

* Applies a series of actions in a single MobX transaction.
* TODO: just merge with applyAction
*

@@ -103,0 +104,0 @@ * Does not return any value

10

lib/core/mst-operations.js

@@ -89,3 +89,3 @@ "use strict";

* Applies a number of JSON patches in a single MobX transaction
*
* TODO: merge with applyPatch
* @export

@@ -118,2 +118,3 @@ * @param {Object} target

* Applies a series of actions in a single MobX transaction.
* TODO: just merge with applyAction
*

@@ -166,2 +167,3 @@ * Does not return any value

function protect(target) {
// TODO: verify that no parent is unprotectd, as that would be a noop
mst_node_1.getMSTAdministration(target).isProtectionEnabled = true;

@@ -171,2 +173,3 @@ }

function unprotect(target) {
// TODO: verify that any node in the given tree is unprotected
mst_node_1.getMSTAdministration(target).isProtectionEnabled = false;

@@ -278,2 +281,3 @@ }

// TODO: give better error messages!
// TODO: also accept path parts
var node = mst_node_1.getMSTAdministration(target).resolve(path);

@@ -325,2 +329,3 @@ return node ? node.target : undefined;

function detach(thing) {
// TODO: should throw if it cannot be removed from the parent? e.g. parent type wouldn't allow that
mst_node_1.getMSTAdministration(thing).detach();

@@ -335,2 +340,3 @@ return thing;

var node = mst_node_1.getMSTAdministration(thing);
// TODO: should throw if it cannot be removed from the parent? e.g. parent type wouldn't allow that
if (node.isRoot)

@@ -370,3 +376,3 @@ node.die();

exports.walk = walk;
// TODO: remove or to test utils?
// TODO: remove
function testActions(factory, initialState) {

@@ -373,0 +379,0 @@ var actions = [];

4

lib/core/reference.js

@@ -13,3 +13,3 @@ "use strict";

var object_1 = require("../types/complex-types/object");
var type_1 = require("../types/type");
var type_checker_1 = require("../types/type-checker");
var mst_operations_1 = require("./mst-operations");

@@ -59,3 +59,3 @@ var Reference = (function () {

else if (mst_node_1.isMST(value)) {
type_1.typecheck(this.type, value);
type_checker_1.typecheck(this.type, value);
var base = mst_node_1.getMSTAdministration(this.owner);

@@ -62,0 +62,0 @@ var target = mst_node_1.getMSTAdministration(value);

4

lib/index.js

@@ -9,2 +9,6 @@ "use strict";

require("./types/complex-types/complex-type");
// TODO: things that should not be exposed (?)
// TODO: add test to verify exposed api
// escapeJsonPath
// unescapeJsonPath
var types_1 = require("./types");

@@ -11,0 +15,0 @@ exports.types = types_1.types;

3

lib/types/complex-types/array.d.ts
import { IObservableArray, IArrayWillChange, IArrayWillSplice, IArrayChange, IArraySplice } from "mobx";
import { IJsonPatch, MSTAdministration } from "../../core";
import { IType, IComplexType } from "../type";
import { IContext, IValidationResult } from "../type-checker";
import { ComplexType } from "./complex-type";

@@ -21,3 +22,3 @@ export declare function arrayToString(this: IObservableArray<any>): string;

getChildType(key: string): IType<any, any>;
isValidSnapshot(snapshot: any): boolean;
isValidSnapshot(value: any, context: IContext): IValidationResult;
getDefaultSnapshot(): never[];

@@ -24,0 +25,0 @@ removeChild(node: MSTAdministration, subpath: string): void;

8

lib/types/complex-types/array.js

@@ -23,2 +23,3 @@ "use strict";

var type_1 = require("../type");
var type_checker_1 = require("../type-checker");
var complex_type_1 = require("./complex-type");

@@ -143,5 +144,8 @@ function arrayToString() {

};
ArrayType.prototype.isValidSnapshot = function (snapshot) {
ArrayType.prototype.isValidSnapshot = function (value, context) {
var _this = this;
return Array.isArray(snapshot) && snapshot.every(function (item) { return _this.subType.is(item); });
if (!Array.isArray(value)) {
return type_checker_1.typeCheckFailure(context, value);
}
return type_checker_1.flattenTypeErrors(value.map(function (item, index) { return _this.subType.validate(item, type_checker_1.getContextForPath(context, "" + index, _this.subType)); }));
};

@@ -148,0 +152,0 @@ ArrayType.prototype.getDefaultSnapshot = function () {

6

lib/types/complex-types/complex-type.d.ts
import { IType, Type } from "../type";
import { IContext, IValidationResult } from "../type-checker";
/**

@@ -17,8 +18,7 @@ * A complex type produces a MST node (Node in the state tree)

abstract getChildType(key: string): IType<any, any>;
abstract isValidSnapshot(snapshot: any): boolean;
abstract removeChild(node: MSTAdministration, subpath: string): void;
is(value: any): value is S | (T & IMSTNode);
abstract isValidSnapshot(value: any, context: IContext): IValidationResult;
validate(value: any, context: IContext): IValidationResult;
}
import { IMSTNode } from "../../core/mst-node";
import { MSTAdministration } from "../../core/mst-node-administration";
import { IJsonPatch } from "../../core/json-patch";

11

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

@@ -16,2 +16,3 @@ "use strict";

var utils_1 = require("../../utils");
var type_checker_1 = require("../type-checker");
function toJSON() {

@@ -36,3 +37,3 @@ return mst_node_1.getMSTAdministration(this).snapshot;

if (subpath === void 0) { subpath = ""; }
type_1.typecheck(this, snapshot);
type_checker_1.typecheck(this, snapshot);
var instance = this.createNewInstance();

@@ -60,10 +61,10 @@ // tslint:disable-next-line:no_unused-variable

};
ComplexType.prototype.is = function (value) {
ComplexType.prototype.validate = function (value, context) {
if (!value || typeof value !== "object")
return false;
return type_checker_1.typeCheckFailure(context, value);
if (mst_node_1.isMST(value)) {
return mst_node_1.getType(value) === this;
return mst_node_1.getType(value) === this ? type_checker_1.typeCheckSuccess() : type_checker_1.typeCheckFailure(context, value);
// it is tempting to compare snapshots, but in that case we should always clone on assignments...
}
return this.isValidSnapshot(value);
return this.isValidSnapshot(value, context);
};

@@ -70,0 +71,0 @@ return ComplexType;

3

lib/types/complex-types/map.d.ts
import { ObservableMap, IMapChange, IMapWillChange } from "mobx";
import { MSTAdministration, IJsonPatch } from "../../core";
import { IType, IComplexType } from "../type";
import { IContext, IValidationResult } from "../type-checker";
import { ComplexType } from "./complex-type";

@@ -26,3 +27,3 @@ export interface IExtendedObservableMap<T> extends ObservableMap<T> {

getChildType(key: string): IType<any, any>;
isValidSnapshot(snapshot: any): boolean;
isValidSnapshot(value: any, context: IContext): IValidationResult;
getDefaultSnapshot(): {};

@@ -29,0 +30,0 @@ removeChild(node: MSTAdministration, subpath: string): void;

8

lib/types/complex-types/map.js

@@ -24,2 +24,3 @@ "use strict";

var type_1 = require("../type");
var type_checker_1 = require("../type-checker");
var complex_type_1 = require("./complex-type");

@@ -178,5 +179,8 @@ function mapToString() {

};
MapType.prototype.isValidSnapshot = function (snapshot) {
MapType.prototype.isValidSnapshot = function (value, context) {
var _this = this;
return utils_1.isPlainObject(snapshot) && Object.keys(snapshot).every(function (key) { return _this.subType.is(snapshot[key]); });
if (!utils_1.isPlainObject(value)) {
return type_checker_1.typeCheckFailure(context, value);
}
return type_checker_1.flattenTypeErrors(Object.keys(value).map(function (path) { return _this.subType.validate(value[path], type_checker_1.getContextForPath(context, path, _this.subType)); }));
};

@@ -183,0 +187,0 @@ MapType.prototype.getDefaultSnapshot = function () {

3

lib/types/complex-types/object.d.ts
import { IObjectChange, IObjectWillChange } from "mobx";
import { MSTAdministration, IMSTNode, IJsonPatch } from "../../core";
import { IType, IComplexType } from "../type";
import { IContext, IValidationResult } from "../type-checker";
import { ComplexType } from "./complex-type";

@@ -30,3 +31,3 @@ export declare class ObjectType extends ComplexType<any, any> {

getChildType(key: string): IType<any, any>;
isValidSnapshot(snapshot: any): boolean;
isValidSnapshot(value: any, context: IContext): IValidationResult;
private forAllProps(fn);

@@ -33,0 +34,0 @@ describe(): string;

18

lib/types/complex-types/object.js

@@ -23,2 +23,3 @@ "use strict";

var type_1 = require("../type");
var type_checker_1 = require("../type-checker");
var complex_type_1 = require("./complex-type");

@@ -29,2 +30,3 @@ var primitives_1 = require("../primitives");

var identifier_1 = require("../utility-types/identifier");
var late_1 = require("../utility-types/late");
var identifier_property_1 = require("../property-types/identifier-property");

@@ -171,9 +173,8 @@ var reference_property_1 = require("../property-types/reference-property");

};
ObjectType.prototype.isValidSnapshot = function (snapshot) {
if (!utils_1.isPlainObject(snapshot))
return false;
for (var key in this.props)
if (!this.props[key].isValidSnapshot(snapshot))
return false;
return true;
ObjectType.prototype.isValidSnapshot = function (value, context) {
var _this = this;
if (!utils_1.isPlainObject(value)) {
return type_checker_1.typeCheckFailure(context, value);
}
return type_checker_1.flattenTypeErrors(Object.keys(this.props).map(function (path) { return _this.props[path].validate(value, context); }));
};

@@ -240,2 +241,5 @@ ObjectType.prototype.forAllProps = function (fn) {

return type.identifierAttribute;
// TODO: make this a generic utility!
if (type instanceof late_1.Late)
return type.definition().identifierAttribute;
return null;

@@ -242,0 +246,0 @@ }

3

lib/types/primitives.d.ts
import { ISimpleType, Type } from "./type";
import { IContext, IValidationResult } from "./type-checker";
export declare class CoreType<T> extends Type<T, T> {

@@ -7,3 +8,3 @@ readonly checker: (value: any) => boolean;

create(value: any): any;
is(thing: any): thing is T;
validate(value: any, context: IContext): IValidationResult;
readonly identifierAttribute: null;

@@ -10,0 +11,0 @@ }

8

lib/types/primitives.js

@@ -14,2 +14,3 @@ "use strict";

var type_1 = require("./type");
var type_checker_1 = require("./type-checker");
var utils_1 = require("../utils");

@@ -31,4 +32,7 @@ var CoreType = (function (_super) {

};
CoreType.prototype.is = function (thing) {
return utils_1.isPrimitive(thing) && this.checker(thing);
CoreType.prototype.validate = function (value, context) {
if (utils_1.isPrimitive(value) && this.checker(value)) {
return type_checker_1.typeCheckSuccess();
}
return type_checker_1.typeCheckFailure(context, value);
};

@@ -35,0 +39,0 @@ Object.defineProperty(CoreType.prototype, "identifierAttribute", {

3

lib/types/property-types/action-property.d.ts
import { Property } from "./property";
import { IContext, IValidationResult } from "../type-checker";
export declare class ActionProperty extends Property {

@@ -6,3 +7,3 @@ invokeAction: Function;

initialize(target: any): void;
isValidSnapshot(snapshot: any): boolean;
validate(snapshot: any, context: IContext): IValidationResult;
}

8

lib/types/property-types/action-property.js

@@ -16,2 +16,3 @@ "use strict";

var property_1 = require("./property");
var type_checker_1 = require("../type-checker");
var ActionProperty = (function (_super) {

@@ -27,4 +28,7 @@ __extends(ActionProperty, _super);

};
ActionProperty.prototype.isValidSnapshot = function (snapshot) {
return !(this.name in snapshot);
ActionProperty.prototype.validate = function (snapshot, context) {
if (this.name in snapshot) {
return type_checker_1.typeCheckFailure(type_checker_1.getContextForPath(context, this.name), snapshot[this.name], "Action properties should not be provided in the snapshot");
}
return type_checker_1.typeCheckSuccess();
};

@@ -31,0 +35,0 @@ return ActionProperty;

3

lib/types/property-types/computed-property.d.ts
import { Property } from "./property";
import { IContext, IValidationResult } from "../type-checker";
export declare class ComputedProperty extends Property {

@@ -7,3 +8,3 @@ getter: () => any;

initializePrototype(proto: any): void;
isValidSnapshot(snapshot: any): boolean;
validate(snapshot: any, context: IContext): IValidationResult;
}

8

lib/types/property-types/computed-property.js

@@ -15,2 +15,3 @@ "use strict";

var property_1 = require("./property");
var type_checker_1 = require("../type-checker");
var ComputedProperty = (function (_super) {

@@ -27,4 +28,7 @@ __extends(ComputedProperty, _super);

};
ComputedProperty.prototype.isValidSnapshot = function (snapshot) {
return !(this.name in snapshot);
ComputedProperty.prototype.validate = function (snapshot, context) {
if (this.name in snapshot) {
return type_checker_1.typeCheckFailure(type_checker_1.getContextForPath(context, this.name), snapshot[this.name], "Computed properties should not be provided in the snapshot");
}
return type_checker_1.typeCheckSuccess();
};

@@ -31,0 +35,0 @@ return ComputedProperty;

3

lib/types/property-types/identifier-property.d.ts
import { IObjectWillChange } from "mobx";
import { Property } from "./property";
import { IType } from "../type";
import { IContext, IValidationResult } from "../type-checker";
export declare class IdentifierProperty extends Property {

@@ -11,4 +12,4 @@ subtype: IType<any, any>;

deserialize(instance: any, snapshot: any): void;
isValidSnapshot(snapshot: any): boolean;
validate(snapshot: any, context: IContext): IValidationResult;
isValidIdentifier(identifier: any): boolean;
}

15

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

@@ -17,3 +17,3 @@ "use strict";

var utils_1 = require("../../utils");
var type_1 = require("../type");
var type_checker_1 = require("../type-checker");
var IdentifierProperty = (function (_super) {

@@ -36,3 +36,3 @@ __extends(IdentifierProperty, _super);

utils_1.fail("Not a valid identifier: '" + identifier);
type_1.typecheck(this.subtype, identifier);
type_checker_1.typecheck(this.subtype, identifier);
var node = core_1.getMSTAdministration(change.object);

@@ -54,6 +54,13 @@ node.assertWritable();

};
IdentifierProperty.prototype.isValidSnapshot = function (snapshot) {
return this.isValidIdentifier(snapshot[this.name]);
IdentifierProperty.prototype.validate = function (snapshot, context) {
if (!this.isValidIdentifier(snapshot[this.name])) {
return type_checker_1.typeCheckFailure(type_checker_1.getContextForPath(context, this.name, this.subtype), snapshot[this.name], "The provided identifier is not valid");
}
return type_checker_1.typeCheckSuccess();
};
IdentifierProperty.prototype.isValidIdentifier = function (identifier) {
// TODO: MWE, I don't think this isValidIdentifier things makes sense.
// Who are we to decide? Maybe just rule out empty string
// Making types.identifier(types.refinement(types.string, (v) => coolCheck(v))) work would be great!
// On the other hand, this avoids problems with json paths, so maybe we should support all identifiers that don't require further escaping?
if (typeof identifier !== "number" && !utils_1.isValidIdentifier(identifier))

@@ -60,0 +67,0 @@ return false;

3

lib/types/property-types/property.d.ts
import { IMSTNode } from "../../core/";
import { IContext, IValidationResult } from "../type-checker";
import { IObjectChange, IObjectWillChange } from "mobx";

@@ -12,3 +13,3 @@ export declare abstract class Property {

deserialize(instance: IMSTNode, snapshot: any): void;
abstract isValidSnapshot(snapshot: any): boolean;
abstract validate(snapshot: any, context: IContext): IValidationResult;
}

3

lib/types/property-types/reference-property.d.ts
import { Property } from "./property";
import { IType } from "../type";
import { IContext, IValidationResult } from "../type-checker";
export declare class ReferenceProperty extends Property {

@@ -10,3 +11,3 @@ private type;

deserialize(instance: any, snapshot: any): void;
isValidSnapshot(snapshot: any): boolean;
validate(value: any, context: IContext): IValidationResult;
}

8

lib/types/property-types/reference-property.js

@@ -17,2 +17,3 @@ "use strict";

var reference_1 = require("../../core/reference");
var type_checker_1 = require("../type-checker");
var ReferenceProperty = (function (_super) {

@@ -58,5 +59,8 @@ __extends(ReferenceProperty, _super);

};
ReferenceProperty.prototype.isValidSnapshot = function (snapshot) {
ReferenceProperty.prototype.validate = function (value, context) {
// TODO: and check name is string or $ref object
return this.name in snapshot;
if (this.name in value) {
return type_checker_1.typeCheckSuccess();
}
return type_checker_1.typeCheckFailure(type_checker_1.getContextForPath(context, this.name, this.type), undefined, "Reference is required.");
};

@@ -63,0 +67,0 @@ return ReferenceProperty;

3

lib/types/property-types/value-property.d.ts
import { IObjectWillChange, IObjectChange } from "mobx";
import { Property } from "./property";
import { IType } from "../type";
import { IContext, IValidationResult } from "../type-checker";
export declare class ValueProperty extends Property {

@@ -13,3 +14,3 @@ type: IType<any, any>;

deserialize(instance: any, snapshot: any): void;
isValidSnapshot(snapshot: any): boolean;
validate(snapshot: any, context: IContext): IValidationResult;
}

5

lib/types/property-types/value-property.js

@@ -16,2 +16,3 @@ "use strict";

var core_1 = require("../../core");
var type_checker_1 = require("../type-checker");
var ValueProperty = (function (_super) {

@@ -50,4 +51,4 @@ __extends(ValueProperty, _super);

};
ValueProperty.prototype.isValidSnapshot = function (snapshot) {
return this.type.is(snapshot[this.name]);
ValueProperty.prototype.validate = function (snapshot, context) {
return this.type.validate(snapshot[this.name], type_checker_1.getContextForPath(context, this.name, this.type));
};

@@ -54,0 +55,0 @@ return ValueProperty;

3

lib/types/property-types/view-property.d.ts
import { Property } from "./property";
import { IContext, IValidationResult } from "../type-checker";
export declare class ViewProperty extends Property {

@@ -6,4 +7,4 @@ invokeView: Function;

initialize(target: any): void;
isValidSnapshot(snapshot: any): boolean;
validate(snapshot: any, context: IContext): IValidationResult;
}
export declare function createViewInvoker(name: string, fn: Function): any;

8

lib/types/property-types/view-property.js

@@ -17,2 +17,3 @@ "use strict";

var property_1 = require("./property");
var type_checker_1 = require("../type-checker");
var ViewProperty = (function (_super) {

@@ -28,4 +29,7 @@ __extends(ViewProperty, _super);

};
ViewProperty.prototype.isValidSnapshot = function (snapshot) {
return !(this.name in snapshot);
ViewProperty.prototype.validate = function (snapshot, context) {
if (this.name in snapshot) {
return type_checker_1.typeCheckFailure(type_checker_1.getContextForPath(context, this.name), snapshot[this.name], "View properties should not be provided in the snapshot");
}
return type_checker_1.typeCheckSuccess();
};

@@ -32,0 +36,0 @@ return ViewProperty;

6

lib/types/type.d.ts

@@ -6,2 +6,3 @@ export interface ISnapshottable<S> {

is(thing: any): thing is S | T;
validate(thing: any, context: IContext): IValidationResult;
create(snapshot?: S, environment?: any): T;

@@ -24,4 +25,5 @@ isType: boolean;

abstract create(snapshot: any): any;
abstract is(thing: any): thing is S | T;
abstract validate(thing: any, context: IContext): IValidationResult;
abstract describe(): string;
is(value: any): value is S | T;
readonly Type: T;

@@ -31,3 +33,3 @@ readonly SnapshotType: S;

}
export declare function typecheck(type: IType<any, any>, value: any): void;
import { IMSTNode } from "../core/mst-node";
import { IContext, IValidationResult } from "./type-checker";

18

lib/types/type.js

@@ -12,2 +12,5 @@ "use strict";

}
Type.prototype.is = function (value) {
return this.validate(value, [{ path: "", type: this }]).length === 0;
};
Object.defineProperty(Type.prototype, "Type", {

@@ -30,18 +33,3 @@ get: function () {

exports.Type = Type;
function typecheck(type, value) {
if (!type.is(value)) {
var currentTypename = mst_node_1.maybeMST(value, function (node) { return " of type " + node.type.name + ":"; }, function () { return ""; });
var isSnapshotCompatible = mst_node_1.isMST(value) && type.is(mst_node_1.getMSTAdministration(value).snapshot);
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 optional_1.OptionalValue && primitives_1.isPrimitiveType(type.type))
? "."
: (", expected an instance of " + type.name + " or a snapshot like '" + type.describe() + "' instead." +
(isSnapshotCompatible ? " (Note that a snapshot of the provided value is compatible with the targeted type)" : ""))));
}
}
exports.typecheck = typecheck;
var utils_1 = require("../utils");
var mst_node_1 = require("../core/mst-node");
var primitives_1 = require("./primitives");
var optional_1 = require("./utility-types/optional");
//# sourceMappingURL=type.js.map

3

lib/types/utility-types/frozen.d.ts
import { ISimpleType, Type } from "../type";
import { IContext, IValidationResult } from "../type-checker";
export declare class Frozen<T> extends Type<T, T> {

@@ -6,5 +7,5 @@ constructor();

create(value: any): any;
is(value: any): value is T;
validate(value: any, context: IContext): IValidationResult;
readonly identifierAttribute: null;
}
export declare const frozen: ISimpleType<any>;

8

lib/types/utility-types/frozen.js

@@ -14,2 +14,3 @@ "use strict";

var type_1 = require("../type");
var type_checker_1 = require("../type-checker");
var utils_1 = require("../../utils");

@@ -40,4 +41,7 @@ function freeze(value) {

};
Frozen.prototype.is = function (value) {
return utils_1.isSerializable(value);
Frozen.prototype.validate = function (value, context) {
if (!utils_1.isSerializable(value)) {
return type_checker_1.typeCheckFailure(context, value);
}
return type_checker_1.typeCheckSuccess();
};

@@ -44,0 +48,0 @@ Object.defineProperty(Frozen.prototype, "identifierAttribute", {

1

lib/types/utility-types/identifier.js

@@ -7,2 +7,3 @@ "use strict";

if (baseType === void 0) { baseType = primitives_1.string; }
// TODO: MWE: this seems contrived, let's not assert anything and support unions, refinements etc.
if (baseType !== primitives_1.string && baseType !== primitives_1.number)

@@ -9,0 +10,0 @@ utils_1.fail("Only 'types.number' and 'types.string' are acceptable as type specification for identifiers");

3

lib/types/utility-types/late.d.ts
import { Type, IType } from "../type";
import { IContext, IValidationResult } from "../type-checker";
export declare class Late<S, T> extends Type<S, T> {

@@ -9,3 +10,3 @@ readonly definition: () => IType<S, T>;

describe(): string;
is(value: any): value is T;
validate(value: any, context: IContext): IValidationResult;
readonly identifierAttribute: string | null;

@@ -12,0 +13,0 @@ }

8

lib/types/utility-types/late.js

@@ -15,2 +15,3 @@ "use strict";

var type_1 = require("../type");
var type_checker_1 = require("../type-checker");
var Late = (function (_super) {

@@ -41,4 +42,7 @@ __extends(Late, _super);

};
Late.prototype.is = function (value) {
return this.subType.is(value);
Late.prototype.validate = function (value, context) {
if (!this.subType.is(value)) {
return type_checker_1.typeCheckFailure(context, value);
}
return type_checker_1.typeCheckSuccess();
};

@@ -45,0 +49,0 @@ Object.defineProperty(Late.prototype, "identifierAttribute", {

3

lib/types/utility-types/literal.d.ts
import { ISimpleType, Type } from "../type";
import { IContext, IValidationResult } from "../type-checker";
export declare class Literal<T> extends Type<T, T> {

@@ -7,5 +8,5 @@ readonly value: any;

describe(): string;
is(value: any): value is T;
validate(value: any, context: IContext): IValidationResult;
readonly identifierAttribute: null;
}
export declare function literal<S>(value: S): ISimpleType<S>;

10

lib/types/utility-types/literal.js

@@ -15,2 +15,3 @@ "use strict";

var utils_1 = require("../../utils");
var type_checker_1 = require("../type-checker");
var Literal = (function (_super) {

@@ -24,3 +25,3 @@ __extends(Literal, _super);

Literal.prototype.create = function (snapshot) {
type_1.typecheck(this, snapshot);
type_checker_1.typecheck(this, snapshot);
return this.value;

@@ -31,4 +32,7 @@ };

};
Literal.prototype.is = function (value) {
return value === this.value && utils_1.isPrimitive(value);
Literal.prototype.validate = function (value, context) {
if (utils_1.isPrimitive(value) && value === this.value) {
return type_checker_1.typeCheckSuccess();
}
return type_checker_1.typeCheckFailure(context, value);
};

@@ -35,0 +39,0 @@ Object.defineProperty(Literal.prototype, "identifierAttribute", {

3

lib/types/utility-types/optional.d.ts
import { Type, IType } from "../type";
import { IContext, IValidationResult } from "../type-checker";
export declare type IFunctionReturn<T> = () => T;

@@ -10,3 +11,3 @@ export declare type IOptionalValue<S, T> = S | T | IFunctionReturn<S> | IFunctionReturn<T>;

create(value: any): T;
is(value: any): value is S | T;
validate(value: any, context: IContext): IValidationResult;
readonly identifierAttribute: string | null;

@@ -13,0 +14,0 @@ }

10

lib/types/utility-types/optional.js

@@ -14,2 +14,3 @@ "use strict";

var type_1 = require("../type");
var type_checker_1 = require("../type-checker");
var OptionalValue = (function (_super) {

@@ -36,5 +37,8 @@ __extends(OptionalValue, _super);

};
OptionalValue.prototype.is = function (value) {
OptionalValue.prototype.validate = function (value, context) {
// defaulted values can be skipped
return value === undefined || this.type.is(value);
if (value === undefined || this.type.is(value)) {
return type_checker_1.typeCheckSuccess();
}
return type_checker_1.typeCheckFailure(context, value);
};

@@ -54,3 +58,3 @@ Object.defineProperty(OptionalValue.prototype, "identifierAttribute", {

var defaultSnapshot = mst_node_1.isMST(defaultValue) ? mst_node_1.getMSTAdministration(defaultValue).snapshot : defaultValue;
type_1.typecheck(type, defaultSnapshot);
type_checker_1.typecheck(type, defaultSnapshot);
return new OptionalValue(type, defaultValueOrFunction);

@@ -57,0 +61,0 @@ }

3

lib/types/utility-types/refinement.d.ts
import { IType, Type } from "../type";
import { IContext, IValidationResult } from "../type-checker";
export declare class Refinement extends Type<any, any> {

@@ -8,3 +9,3 @@ readonly type: IType<any, any>;

create(value: any): any;
is(value: any): value is any;
validate(value: any, context: IContext): IValidationResult;
readonly identifierAttribute: string | null;

@@ -11,0 +12,0 @@ }

8

lib/types/utility-types/refinement.js

@@ -16,2 +16,3 @@ "use strict";

var core_1 = require("../../core");
var type_checker_1 = require("../type-checker");
var Refinement = (function (_super) {

@@ -36,4 +37,7 @@ __extends(Refinement, _super);

};
Refinement.prototype.is = function (value) {
return this.type.is(value) && this.predicate(value);
Refinement.prototype.validate = function (value, context) {
if (this.type.is(value) && this.predicate(value)) {
return type_checker_1.typeCheckSuccess();
}
return type_checker_1.typeCheckFailure(context, value);
};

@@ -40,0 +44,0 @@ Object.defineProperty(Refinement.prototype, "identifierAttribute", {

3

lib/types/utility-types/union.d.ts
import { IType, Type } from "../type";
import { IContext, IValidationResult } from "../type-checker";
export declare type ITypeDispatcher = (snapshot: any) => IType<any, any>;

@@ -9,3 +10,3 @@ export declare class Union extends Type<any, any> {

create(value: any): any;
is(value: any): value is any;
validate(value: any, context: IContext): IValidationResult;
readonly identifierAttribute: string | null;

@@ -12,0 +13,0 @@ }

8

lib/types/utility-types/union.js

@@ -14,2 +14,3 @@ "use strict";

var type_1 = require("../type");
var type_checker_1 = require("../type-checker");
var utils_1 = require("../../utils");

@@ -40,4 +41,7 @@ var Union = (function (_super) {

};
Union.prototype.is = function (value) {
return this.types.some(function (type) { return type.is(value); });
Union.prototype.validate = function (value, context) {
if (this.types.some(function (type) { return type.is(value); })) {
return type_checker_1.typeCheckSuccess();
}
return type_checker_1.typeCheckFailure(context, value);
};

@@ -44,0 +48,0 @@ Object.defineProperty(Union.prototype, "identifierAttribute", {

1

lib/utils.d.ts

@@ -0,1 +1,2 @@

export declare const EMPTY_ARRAY: ReadonlyArray<never>;
export declare type IDisposer = () => void;

@@ -2,0 +3,0 @@ export declare function fail(message?: string): never;

1

lib/utils.js
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.EMPTY_ARRAY = Object.freeze([]);
function fail(message) {

@@ -4,0 +5,0 @@ if (message === void 0) { message = "Illegal state"; }

4

mobx-state-tree.umd.js

@@ -1,2 +0,2 @@

!function(t,e){"object"==typeof exports&&"object"==typeof module?module.exports=e(require("mobx")):"function"==typeof define&&define.amd?define(["mobx"],e):"object"==typeof exports?exports.mobxStateTree=e(require("mobx")):t.mobxStateTree=e(t.mobx)}(this,function(t){return function(t){function e(r){if(n[r])return n[r].exports;var i=n[r]={exports:{},id:r,loaded:!1};return t[r].call(i.exports,i,i.exports,e),i.loaded=!0,i.exports}var n={};return e.m=t,e.c=n,e.p="",e(0)}([function(t,e,n){"use strict";function r(t){for(var n in t)e.hasOwnProperty(n)||(e[n]=t[n])}Object.defineProperty(e,"__esModule",{value:!0}),n(2),n(9);var i=n(23);e.types=i.types,r(n(6)),r(n(8));var o=n(4);e.isMST=o.isMST,e.getType=o.getType,e.getChildType=o.getChildType,e.onAction=o.onAction,e.applyAction=o.applyAction;var a=n(20);e.asReduxStore=a.asReduxStore,e.connectReduxDevtools=a.connectReduxDevtools},function(t,e){"use strict";function n(t){throw void 0===t&&(t="Illegal state"),r(!1,t),"!"}function r(t,e){if(void 0===e&&(e="Illegal state"),!t)throw new Error("[mobx-state-tree] "+e)}function i(t){return t}function o(){return null}function a(t){for(var e=[],n=1;n<arguments.length;n++)e[n-1]=arguments[n];for(var r=0;r<e.length;r++){var i=e[r];for(var o in i)t[o]=i[o]}return t}function s(t){if(null===t||"object"!=typeof t)return!1;var e=Object.getPrototypeOf(t);return e===Object.prototype||null===e}function u(t){return!(null===t||"object"!=typeof t||t instanceof Date||t instanceof RegExp)}function c(t){return null===t||void 0===t||"string"==typeof t||"number"==typeof t||"boolean"==typeof t||t instanceof Date}function p(t){return"function"!=typeof t}function f(t,e,n){Object.defineProperty(t,e,{enumerable:!1,writable:!1,configurable:!0,value:n})}function l(t,e,n){Object.defineProperty(t,e,{enumerable:!1,writable:!0,configurable:!0,value:n})}function h(t,e,n){Object.defineProperty(t,e,{enumerable:!0,writable:!1,configurable:!0,value:n})}function d(t,e){return t.push(e),function(){var n=t.indexOf(e);n!==-1&&t.splice(n,1)}}function y(t,e){return m.call(t,e)}function v(t){for(var e=new Array(t.length),n=0;n<t.length;n++)e[n]=t[n];return e}function b(t,e){return new Function("f","return function "+t+"() { return f.apply(this, arguments)}")(e)}function g(t){return"string"==typeof t&&/^[a-z0-9_-]+$/i.test(t)}Object.defineProperty(e,"__esModule",{value:!0}),e.fail=n,e.invariant=r,e.identity=i,e.nothing=o,e.extend=a,e.isPlainObject=s,e.isMutable=u,e.isPrimitive=c,e.isSerializable=p,e.addHiddenFinalProp=f,e.addHiddenWritableProp=l,e.addReadOnlyProp=h,e.registerEventHandler=d;var m=Object.prototype.hasOwnProperty;e.hasOwnProperty=y,e.argsToArray=v,e.createNamedFunction=b,e.isValidIdentifier=g},function(t,e,n){"use strict";function r(t){return"object"==typeof t&&t&&t.isType===!0}function i(t,e){if(!t.is(e)){var n=s.maybeMST(e,function(t){return" of type "+t.type.name+":"},function(){return""}),r=s.isMST(e)&&t.is(s.getMSTAdministration(e).snapshot);a.fail("Value"+n+" '"+(a.isSerializable(e)?JSON.stringify(e):e)+"' is not assignable to type: "+t.name+(u.isPrimitiveType(t)||t instanceof c.OptionalValue&&u.isPrimitiveType(t.type)?".":", expected an instance of "+t.name+" or a snapshot like '"+t.describe()+"' instead."+(r?" 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e=a.getMSTAdministration(this);e.assertWritable();var i=n.identifier;n.setNewValue(t),n.identifier!==i&&e.emitPatch({op:"replace",path:a.escapeJsonPath(r.name),value:n.serialize},e)}}),t[this.name]=e[this.name]},e.prototype.serialize=function(t,e){e[this.name]=t[this.name+"$value"].serialize()},e.prototype.deserialize=function(t,e){t[this.name+"$value"].setNewValue(e[this.name])},e.prototype.validate=function(t,e){return this.name in t?u.typeCheckSuccess():u.typeCheckFailure(u.getContextForPath(e,this.name,this.type),void 0,"Reference is required.")},e}(i.Property);e.ReferenceProperty=c},function(t,e,n){"use strict";var r=this&&this.__extends||function(){var t=Object.setPrototypeOf||{__proto__:[]}instanceof Array&&function(t,e){t.__proto__=e}||function(t,e){for(var n in e)e.hasOwnProperty(n)&&(t[n]=e[n])};return function(e,n){function r(){this.constructor=e}t(e,n),e.prototype=null===n?Object.create(n):(r.prototype=n.prototype,new r)}}();Object.defineProperty(e,"__esModule",{value:!0});var i=n(4),o=n(8),a=n(5),s=n(2),u=function(t){function e(e,n){var r=t.call(this,e)||this;return r.type=n,r}return r(e,t),e.prototype.initializePrototype=function(t){i.observable.ref(t,this.name,{value:void 0})},e.prototype.initialize=function(t,e){t[this.name]=this.type.create(e[this.name])},e.prototype.willChange=function(t){var e=a.getMSTAdministration(t.object);return t.newValue=e.reconcileChildren(this.type,[t.object[t.name]],[t.newValue],[t.name])[0],t},e.prototype.didChange=function(t){var e=a.getMSTAdministration(t.object);e.emitPatch({op:"replace",path:a.escapeJsonPath(this.name),value:a.valueToSnapshot(t.newValue)},e)},e.prototype.serialize=function(t,e){e[this.name]=a.valueToSnapshot(t[this.name])},e.prototype.deserialize=function(t,e){var n=this;a.maybeMST(t[this.name],function(t){t.applySnapshot(e[n.name])},function(){t[n.name]=e[n.name]})},e.prototype.validate=function(t,e){return this.type.validate(t[this.name],s.getContextForPath(e,this.name,this.type))},e}(o.Property);e.ValueProperty=u},function(t,e,n){"use strict";function r(t,e){var n=function(){var t=this,n=arguments,r=s.getMSTAdministration(this);return r.assertAlive(),o.extras.allowStateChanges(!1,function(){return e.apply(t,n)})};return a.createNamedFunction(t,n)}var i=this&&this.__extends||function(){var t=Object.setPrototypeOf||{__proto__:[]}instanceof Array&&function(t,e){t.__proto__=e}||function(t,e){for(var n in e)e.hasOwnProperty(n)&&(t[n]=e[n])};return function(e,n){function r(){this.constructor=e}t(e,n),e.prototype=null===n?Object.create(n):(r.prototype=n.prototype,new r)}}();Object.defineProperty(e,"__esModule",{value:!0});var o=n(4),a=n(1),s=n(5),u=n(8),c=n(2),p=function(t){function e(e,n){var i=t.call(this,e)||this;return i.invokeView=r(e,n),i}return i(e,t),e.prototype.initialize=function(t){a.addHiddenFinalProp(t,this.name,this.invokeView.bind(t))},e.prototype.validate=function(t,e){return this.name in t?c.typeCheckFailure(c.getContextForPath(e,this.name),t[this.name],"View properties should not be provided in the snapshot"):c.typeCheckSuccess()},e}(u.Property);e.ViewProperty=p,e.createViewInvoker=r},function(t,e,n){"use strict";function r(t){return Object.freeze(t),s.isPlainObject(t)&&Object.keys(t).forEach(function(e){Object.isFrozen(t[e])||r(t[e])}),t}var i=this&&this.__extends||function(){var t=Object.setPrototypeOf||{__proto__:[]}instanceof Array&&function(t,e){t.__proto__=e}||function(t,e){for(var n in e)e.hasOwnProperty(n)&&(t[n]=e[n])};return function(e,n){function r(){this.constructor=e}t(e,n),e.prototype=null===n?Object.create(n):(r.prototype=n.prototype,new r)}}();Object.defineProperty(e,"__esModule",{value:!0});var o=n(3),a=n(2),s=n(1),u=function(t){function e(){return t.call(this,"frozen")||this}return i(e,t),e.prototype.describe=function(){return"<any immutable value>"},e.prototype.create=function(t){return s.invariant(s.isSerializable(t),"Given value should be serializable"),s.isMutable(t)?r(t):t},e.prototype.validate=function(t,e){return s.isSerializable(t)?a.typeCheckSuccess():a.typeCheckFailure(e,t)},Object.defineProperty(e.prototype,"identifierAttribute",{get:function(){return null},enumerable:!0,configurable:!0}),e}(o.Type);e.Frozen=u,e.frozen=new u},function(t,e,n){"use strict";function r(t){return i.union(s,t)}Object.defineProperty(e,"__esModule",{value:!0});var i=n(20),o=n(18),a=n(13),s=a.optional(o.literal(null),null);e.maybe=r},function(t,e,n){"use strict";function r(t,e,n){var r=e.create();return a.invariant(n(s.isMST(r)?s.getMSTAdministration(r).snapshot:r),"Default value for refinement type "+t+" does not pass the predicate."),new c(t,e,n)}var i=this&&this.__extends||function(){var t=Object.setPrototypeOf||{__proto__:[]}instanceof Array&&function(t,e){t.__proto__=e}||function(t,e){for(var n in e)e.hasOwnProperty(n)&&(t[n]=e[n])};return function(e,n){function r(){this.constructor=e}t(e,n),e.prototype=null===n?Object.create(n):(r.prototype=n.prototype,new r)}}();Object.defineProperty(e,"__esModule",{value:!0});var o=n(3),a=n(1),s=n(5),u=n(2),c=function(t){function e(e,n,r){var i=t.call(this,e)||this;return i.type=n,i.predicate=r,i}return i(e,t),e.prototype.describe=function(){return this.name},e.prototype.create=function(t){var e=this.type.create(t),n=s.isMST(e)?s.getMSTAdministration(e).snapshot:e;return a.invariant(this.is(n),"Value "+JSON.stringify(n)+" is not assignable to type "+this.name),e},e.prototype.validate=function(t,e){return this.type.is(t)&&this.predicate(t)?u.typeCheckSuccess():u.typeCheckFailure(e,t)},Object.defineProperty(e.prototype,"identifierAttribute",{get:function(){return this.type.identifierAttribute},enumerable:!0,configurable:!0}),e}(o.Type);e.Refinement=c,e.refinement=r}])});

2

package.json
{
"name": "mobx-state-tree",
"version": "0.6.0",
"version": "0.6.1",
"description": "Opinionated, transactional, MobX powered state container",

@@ -5,0 +5,0 @@ "main": "lib/index.js",

188

README.md
# mobx-state-tree
_Opinionated, transactional, MobX powered state container_
_Opinionated, transactional, MobX powered state container combining the best features of the immutable and mutable world for an optimal DX_

@@ -9,3 +9,11 @@ [![Build Status](https://travis-ci.org/mobxjs/mobx-state-tree.svg?branch=master)](https://travis-ci.org/mobxjs/mobx-state-tree)

* [Api Docs](API.md)
# Contents
* [Installation](#installation)
* [Philosophy & Overview](#philosophy--overview)
* [Concepts](#concepts)
* [Short types overview](#types-overview)
* [Short api overview](#api-overview)
* [FAQ](#FAQ)
* [Full Api Docs](API.md)
* [Changelog](changelog.md)

@@ -20,29 +28,62 @@

# Philosophy
# Philosophy & Overview
`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_.
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.
Simply put, 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.
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.
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_. In other words; each tree has a _shape_ (type information) and _state_ (data).
From this living tree, immutable, structurally shared, snapshots are generated automatically.
(example)
```javascript
import { types, onSnapshot } from "mobx-state-tree"
const Todo = types.model("Todo", {
title: types.string,
done: false
}, {
toggle() {
this.done = !this.done
}
})
const Store = types.model("Store", {
todos: types.array(Todo)
})
// create an instance from a snapshot
const store = Store.create({ todos: [{
title: "Get coffee"
}]})
// listen to new snapshots
onSnapshot(store, (snapshot) => {
console.dir(snapshot)
})
// invoke action that modifies the tree
store.todos[0].toggle()
// prints: `{ todos: [{ title: "Get coffee", done: true }]}`
```
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.
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 [example](https://github.com/mobxjs/mobx-state-tree/blob/4c2b19ec4a6a8d74064e4b8a87c0f8b46e97e621/examples/boxes/src/stores/domain-state.js#L94).
(example)
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!)
(screenshot)
```
[mobx-state-tree] Value '{\"todos\":[{\"turtle\":\"Get tea\"}]}' is not assignable to type: Store, expected an instance of Store or a snapshot like '{ todos: { title: string; done: boolean }[] }' instead.
```
Because state trees are living, mutable models actions are straight-forward to write.
_Runtime type error_
(Example)
![typescript error](docs/tserror.png)
But fear not; actions have many interesting properties.
_Designtime type error_
Because state trees are living, mutable models actions are straight-forward to write; just modify local instance properties where appropiate. See `toggleTodo()` above or the examples below. It is not needed to produce a new state tree yourself, MST's snapshot functionality will derive one for you automatically.
Although mutable sounds scare to some, fear not; actions have many interesting properties.
By default trees cannot only be modified by using an action that belongs to the same subtree.

@@ -54,7 +95,33 @@ 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)).

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).
(screenshot of patches being emitted)
Since MST uses MobX behind the scenes, it integrates seamlessly with [mobx](https://mobx.js.org) and [mobx-react](github.com/mobxjs/mobx-react).
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](https://github.com/mobxjs/mobx-state-tree/blob/4c2b19ec4a6a8d74064e4b8a87c0f8b46e97e621/examples/redux-todomvc/src/index.js#L6).
(screenshot)
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)
A pretty unique feature of MST is that it offers livelyness guarantees; it will throw when reading or writing from objects that are for whatever reason
no longer part of a state tree. This protects you against accidental stale reads of objects still referred by, for example, a closure.
const oldTodo = store.todos[0]
store.removeTodo(0)
```javascript
function logTodo(todo) {
setTimeout(
() => console.log(todo.title),
1000
)
)
logTodo(store.todos[0])
store.removeTodo(0)
// throws exception in one second for using an stale object!
```
Despite all that, you will see that the [API](api.md) is pretty straight forward!

@@ -335,4 +402,38 @@

## LifeCycle hooks
# Types overview
These are the types available in MST. All types can be found in the `types` namespace, e.g. `types.string`. See [Api Docs](API.md) for examples.
## Complex types
* `types.model(properties, actions)` Defines a "class like" type, with properties and actions to operate on the object.
* `types.array(type)` Declares an array of the specified type
* `types.map(type)` Declares an map of the specified type
## Primitive types
* `types.string`
* `types.number`
* `types.boolean`
* `types.Date`
## Utility types
* `types.union(dispatcher?, types...)` create a union of multiple types. If the correct type cannot be inferred unambigously from a snapshot, provide a dispatcher function.
* `types.optional(type, defaultValue)` marks an value as being optional (in e.g. a model). If a value is not provided the `defaultValue` will be used instead. If `defaultValue` is a function, it will be evaluated. This can be used to generate for example id's or timestamps upon creation.
* `types.literal(value)` can be used to create a literal type, a type which only possible value is specifically that value, very powerful in combination with `union`s. E.g. `temperature: types.union(types.literal("hot"), types.literal("cold"))`.
* `types.refinement(baseType, (snapshot) => boolean)` creates a type that is more specific then the base type, e.g. `types.refinement(types.string, value => value.length > 5)` to create a type of strings that can only be longer then 5.
* `types.maybe(type)` makes a type optional and nullable, shorthand for `types.optional(types.union(type, types.literal(null)), null)`.
* `types.late(() => type)` can be used to create recursive or circular types, or types that are spread over files in such a way that circular dependencies between files would be an issue otherwise.
* `types.frozen` Accepts any kind of serializable value (both primitive and complex), but assumes that the value itself is immutable.
## Property types
Property types can only be used as direct member of a `types.model` type and not further composed (for now).
* `types.identifier(subType?)` Only one such member can exist in a `types.model` and should uniquely identify the object. See [identifiers](#identifiers) for more details. `subType` should be either `types.string` or `types.number`, defaulting to the first if not specified.
* `types.reference(targetType, basePath?)` creates a property that is a reference to another item of the given `targetType` somewhere in the same tree. See [references](#references) for more details.
## LifeCycle hooks for `types.model`
| Hook | Meaning |

@@ -345,2 +446,47 @@ | --------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------- |

# Api overview
| signature | |
| ---- | --- |
| `addDisposer(node, () => void) ` | Function to be invoked whenever the target node is to be destroyed |
| `addMiddleware(node, middleware: (actionDescription, next) => any)` | Attaches middleware to a node. See [actions](#actions). Returns disposer. |
| `applyAction(node, actionDescription)` | Replays an action on the targeted node |
| `applyPatch(node, jsonPatch)` | Applies a JSON patch to a node in the tree |
| `applySnapshot(node, snapshot)` | Updates a node with the given snapshot |
| `asReduxStore(node)` | Wraps a node in a Redux store compatible api |
| `clone(node, keepEnvironment?: true | false | newEnvironment)` | Creates a full clone of a certain node. By default preserves the same environment |
| `connectReduxDevtools(removeDevModule, node)` | Connects a node to the redux development tools [example](https://github.com/mobxjs/mobx-state-tree/blob/b01fe97d427ca664f7ecc99349d10e58d08d2d98/examples/redux-todomvc/src/index.js) |
| `destroy(node)` | Kills a node, making it unusable. Removes it from any parent in the process |
| `detach(node)` | Removes a node from it's current parent, and let's it live on as stand alone tree |
| `getChildType(node, property?)` | Returns the declared type of the given property of a node. For arrays and maps `property` can be omitted as they all have the same type |
| `getEnv(node)` | Returns the environment of the given node, see [environments](#environments) |
| `getParent(node, depth=1)` | Returns the intermediate parent of the given node, or a higher one if `depth > 1` |
| `getPath(node)` | Returns the path of a certain node in the tree |
| `getPathParts(node)` | Returns the path of a certain node in the tree, unescaped as separate parts |
| `getRelativePath(base, target)` | Returns the short path which one could use to walk from node `base` to node `target`, assuming they are in the same tree. Up is represented as `../` |
| `getRoot(node)` | Returns the root element of the tree containing `node` |
| `getSnapshot(node)` | Returns the snapshot of provided node. See [snapshots](#snapshots) |
| `getType(node)` | Returns the type of the given node |
| `hasParent(node, depth=1)` | Returns `true` if the node has a parent at the given `depth` |
| `isAlive(node)` | Returns `true` if the node hasn't died yet |
| `isMST(value)` | Returns `true` if the value is a node of a mobx-state-tree |
| `isProtected(value)` | Returns `true` if the given node is protected, see [actions](#actions) |
| `isRoot(node)` | Returns true if the has no parents |
| `joinJsonPath(parts)` | Joins and escapes the given path parts into a json path |
| `onAction(node, (actionDescription) => void` | A built-in middleware that calls the provided callback with an action description upon each invocation. Returns disposer |
| `onPatch(node, (patch) => void)` | Attach a JSONPatch listener, that is invoked for each change in the tree. Returns disposer |
| `onSnapshot` | Attach a snapshot listener, that is invoked for each change in the tree. Returns disposer |
| `protect` | Protects an unprotected tree against modifications from outside actions |
| `recordActions(node)` | Creates a recorder that listens to all actions in the node. Call `.stop()` on the recorder to stop this, and `.replay(target)` to replay the recorded actions on another tree |
| `recordPatches` | Creates a recorder that listens to all patches emitted by the node. Call `.stop()` on the recorder to stop this, and `.replay(target)` to replay the recorded patches on another tree |
| `resolve(node, path)` | Resolves a `path` (json path) relatively to the given `node` |
| `splitJsonPath(path)` | Splits and unescapes the given json path into path parts |
| `tryResolve(node, path)` | Like `resolve`, but just returns `null` if resolving fails at any point in the path |
| `unprotect(node)` | Unprotects a node, making it possible to directly modify any value in the subtree, without actions |
| `walk(startNode, (node) => void)` | Performs a depth-first walk through a tree |
A _disposer_ is a function that cancels the effect it was created for.
# FAQ
## Single or multiple state

@@ -352,8 +498,3 @@

# Examples
# Environments
# FAQ
**Should all state of my app be stored in `mobx-state-tree`?**

@@ -421,2 +562,5 @@ No, or, not necessarily. An application can use both state trees and vanilla MobX observables at the same time.

`types.late(() => require("./OtherType"))`
`types.late(() => require("./OtherType"))`
## Thanks
Thanks to @gcanti who inspired lot of the Type and validation API!
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