mobx-state-tree - npm Package Compare versions

Comparing version 0.9.1 to 0.9.2

changelog.md

@@ -0,1 +1,9 @@
+
+# 0.9.2
+
+Introduced the concept of reverse patches, see [#231](https://github.com/mobxjs/mobx-state-tree/pull/231/)
+* Introduced the `revertPatch` operation, that takes a patch or list of patches, and reverse applies it to the target.
+* `onPatch` now takes a second argument, `includeOldValue`, defaulting to `false`, which, if set to true, includes in the patch any value that is being overwritten as result of the patch. Setting this option to true produces patches that can be used with `revertPatch`
+* `patchRecorder` now introduces additional fields / methods to be able to reverse apply changes: `patchRecorder.cleanPatches`, `patchRecorder.undo`
+
 # 0.9.1
@@ -2,0 +10,0 @@

dist/core/json-patch.d.ts

@@ -6,2 +6,7 @@ export declare type IJsonPatch = {
 };
+export declare type IReversibleJsonPatch = IJsonPatch & {
+    oldValue?: any;
+};
+export declare function invertPatch(patch: IReversibleJsonPatch): IReversibleJsonPatch;
+export declare function stripPatch(patch: IReversibleJsonPatch): IJsonPatch;
 /**
@@ -8,0 +13,0 @@ * escape slashes and backslashes

dist/core/mst-operations.d.ts

@@ -74,5 +74,7 @@ /**
  * @param {(patch: IJsonPatch) => void} callback the callback that is invoked for each patch
+ * @param {includeOldValue} boolean if oldValue is included in the patches, they can be inverted. However patches will become much bigger and might not be suitable for efficient transport
  * @returns {IDisposer} function to remove the listener
  */
 export declare function onPatch(target: IStateTreeNode, callback: (patch: IJsonPatch) => void): IDisposer;
+export declare function onPatch(target: IStateTreeNode, callback: (patch: IReversibleJsonPatch) => void, includeOldValue: true): IDisposer;
 export declare function onSnapshot<S>(target: ObservableMap<S>, callback: (snapshot: {
@@ -95,6 +97,20 @@ [key: string]: S;
 export declare function applyPatch(target: IStateTreeNode, patch: IJsonPatch | IJsonPatch[]): void;
+/**
+ * The inverse function of apply patch.
+ * Given a patch or set of patches, restores the target to the state before the patches where produced.
+ * The inverse patch is computed, and all the patches are applied in reverse order, basically 'rewinding' the target,
+ * so that conceptually the following holds for any set of patches:
+ *
+ * `getSnapshot(x) === getSnapshot(revertPatch(applyPatches(x, patches), patches))`
+ *
+ * Note: Reverting patches will generate a new set of patches as side effect of applying the patches.
+ * Note: only patches that include `oldValue` information are suitable for reverting. Such patches can be generated by passing `true` as second argument when attaching an `onPatch` listener.
+ */
+export declare function revertPatch(target: IStateTreeNode, patch: IReversibleJsonPatch | IReversibleJsonPatch[]): void;
 export interface IPatchRecorder {
-    patches: IJsonPatch[];
+    patches: ReadonlyArray<IReversibleJsonPatch>;
+    cleanPatches: ReadonlyArray<IJsonPatch>;
     stop(): any;
-    replay(target: IStateTreeNode): any;
+    replay(target?: IStateTreeNode): any;
+    undo(target?: IStateTreeNode): void;
 }
@@ -109,6 +125,11 @@ /**
  *      patches: IJsonPatch[]
+ *      // the same set of recorded patches, but without undo information, making them smaller and compliant with json-patch spec
+ *      cleanPatches: IJSonPatch[]
  *      // stop recording patches
- *      stop(): any
- *      // apply all the recorded patches on the given object
- *      replay(target: IStateTreeNode): any
+ *      stop(target?: IStateTreeNode): any
+ *      // apply all the recorded patches on the given target (the original subject if omitted)
+ *      replay(target?: IStateTreeNode): any
+ *      // reverse apply the recorded patches on the given target  (the original subject if omitted)
+ *      // stops the recorder if not already stopped
+ *      undo(): void
  * }
@@ -134,3 +155,3 @@ * ```
 export interface IActionRecorder {
-    actions: ISerializedActionCall[];
+    actions: ReadonlyArray<ISerializedActionCall>;
     stop(): any;
@@ -146,3 +167,3 @@ replay(target: IStateTreeNode): any;
  *      // the recorded actions
- *      actions: IJsonPatch[]
+ *      actions: ISerializedActionCall[]
  *      // stop recording actions
@@ -303,4 +324,4 @@ *      stop(): any
 import { IStateTreeNode } from "./node";
-import { IJsonPatch } from "./json-patch";
+import { IJsonPatch, IReversibleJsonPatch } from "./json-patch";
 import { IDisposer } from "../utils";
 import { ISnapshottable, IType } from "../types/type";

dist/core/node.d.ts

@@ -19,3 +19,3 @@ export declare class Node {
     private readonly disposers;
-    applyPatches: (patches: IJsonPatch[]) => void;
+    applyPatches: (patches: IReversibleJsonPatch[]) => void;
     applySnapshot: (snapshot: any) => void;
@@ -42,5 +42,5 @@ constructor(type: IType<any, any>, parent: Node | null, subpath: string, environment: any, storedValue: any);
     emitSnapshot(snapshot: any): void;
-    applyPatchLocally(subpath: string, patch: IJsonPatch): void;
-    onPatch(onPatch: (patches: IJsonPatch) => void): IDisposer;
-    emitPatch(patch: IJsonPatch, source: Node): void;
+    applyPatchLocally(subpath: string, patch: IReversibleJsonPatch): void;
+    onPatch(onPatch: (patch: IReversibleJsonPatch) => void, includeOldValue: boolean): IDisposer;
+    emitPatch(patch: IReversibleJsonPatch, source: Node): void;
     setParent(newParent: Node | null, subpath?: string | null): void;
@@ -68,5 +68,5 @@ addDisposer(disposer: () => void): void;
 import { IType } from "../types/type";
-import { IJsonPatch } from "./json-patch";
+import { IReversibleJsonPatch } from "./json-patch";
 import { IMiddleWareHandler } from "./action";
 import { IDisposer } from "../utils";
 import { IdentifierCache } from "./identifier-cache";

dist/mobx-state-tree.umd.js

@@ -1,1 +0,1 @@
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Failed to add "+this+" to path '"+t.path+"/"+e+"'."),!this._parent&&t&&t.root===this&&u("A state tree is not allowed to contain itself. 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Changing identifiers is not allowed."):t},e.prototype.describe=function(){return"identifier("+this.identifierType.describe()+")"},e.prototype.isValidSnapshot=function(t,e){return void 0===t||null===t||"string"==typeof t||"number"==typeof t?this.identifierType.validate(t,e):rt(e,t,"References should be a primitive value")},e}(xt),Ft=function(t){function e(e,n){var r=t.call(this,e.name)||this;return r.type=e,r.defaultValue=n,r}return n(e,t),Object.defineProperty(e.prototype,"flags",{get:function(){return this.type.flags|wt.Optional},enumerable:!0,configurable:!0}),e.prototype.describe=function(){return this.type.describe()+"?"},e.prototype.instantiate=function(t,e,n,r){if(void 0===r){var i=this.getDefaultValue(),o=q(i)?G(i).snapshot:i;return this.type.instantiate(t,e,n,o)}return this.type.instantiate(t,e,n,r)},e.prototype.reconcile=function(t,e){return this.type.reconcile(t,this.type.is(e)?e:this.getDefaultValue())},e.prototype.getDefaultValue=function(){var t="function"==typeof this.defaultValue?this.defaultValue():this.defaultValue;return"function"==typeof this.defaultValue&&ot(this,t),t},e.prototype.isValidSnapshot=function(t,e){return void 0===t?nt():this.type.validate(t,e)},e}(xt),Lt=function(){function t(t){this.name=t}return t.prototype.initializePrototype=function(t){},t.prototype.initialize=function(t,e){},t.prototype.willChange=function(t){return null},t.prototype.didChange=function(t){},t.prototype.serialize=function(t,e){},t.prototype.deserialize=function(t,e){},t}(),Mt=function(t){function r(e,n,r){var i=t.call(this,e)||this;return i.getter=n,i.setter=r,i}return n(r,t),r.prototype.initializePrototype=function(t){Object.defineProperty(t,this.name,e.computed(t,this.name,{get:this.getter,set:this.setter,configurable:!0,enumerable:!1}))},r.prototype.validate=function(t,e){return this.name in t?rt(et(e,this.name),t[this.name],"Computed properties should not be provided in the snapshot"):nt()},r}(Lt),Ht=function(t){function e(e){var n=t.call(this,""+e)||this;return n.flags=wt.Literal,n.value=e,n}return n(e,t),e.prototype.instantiate=function(t,e,n,r){return X(this,t,e,n,r)},e.prototype.describe=function(){return JSON.stringify(this.value)},e.prototype.isValidSnapshot=function(t,e){return b(t)&&t===this.value?nt():rt(e,t)},e}(xt),Ut=ht(void 0),$t=function(t){function r(e,n){var r=t.call(this,e)||this;return r.type=n,r}return n(r,t),r.prototype.initializePrototype=function(t){e.observable.ref(t,this.name,{value:Ut.instantiate(null,"",null,void 0)})},r.prototype.initialize=function(t,n){var r=G(t);t[this.name]=this.type.instantiate(r,this.name,r._environment,n[this.name]),e.extras.interceptReads(t,this.name,r.unbox)},r.prototype.getValueNode=function(t){var e=t.$mobx.values[this.name].value;return e||u("Node not available for property "+this.name)},r.prototype.willChange=function(t){var e=G(t.object);return ot(this.type,t.newValue),t.newValue=this.type.reconcile(e.getChildNode(t.name),t.newValue),t},r.prototype.didChange=function(t){var e=G(t.object);e.emitPatch({op:"replace",path:i(this.name),value:this.getValueNode(t.object).snapshot},e)},r.prototype.serialize=function(t,n){e.extras.getAtom(t,this.name).reportObserved(),n[this.name]=this.getValueNode(t).snapshot},r.prototype.deserialize=function(t,e){t[this.name]=e[this.name]},r.prototype.validate=function(t,e){return this.type.validate(t[this.name],et(e,this.name,this.type))},r}(Lt),Jt=function(t){function e(e,n){var r=t.call(this,e)||this;return r.invokeAction=O(e,n),r}return n(e,t),e.prototype.initialize=function(t){P(t,this.name,this.invokeAction.bind(t))},e.prototype.validate=function(t,e){return this.name in t?rt(et(e,this.name),t[this.name],"Action properties should not be provided in the snapshot"):nt()},e}(Lt),Wt=function(t){function e(e,n){var r=t.call(this,e)||this;return r.invokeView=ft(e,n),r}return n(e,t),e.prototype.initialize=function(t){P(t,this.name,this.invokeView.bind(t))},e.prototype.validate=function(t,e){return this.name in t?rt(et(e,this.name),t[this.name],"View properties should not be provided in the snapshot"):nt()},e}(Lt),Bt=function(t){function r(e,n){var r=t.call(this,e)||this;return r.initialValue=n,null!==n&&"object"==typeof n?u("Trying to declare property "+e+" with a non-primitive value. 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Environment can be passed as second argumentt to .create()"),n},t.walk=K,Object.defineProperty(t,"__esModule",{value:!0})});

package.json

 {
   "name": "mobx-state-tree",
-  "version": "0.9.1",
+  "version": "0.9.2",
   "description": "Opinionated, transactional, MobX powered state container",
@@ -5,0 +5,0 @@ "main": "dist/mobx-state-tree.js",

README.md

@@ -118,3 +118,3 @@ <p align="center">
 
-Since MST uses MobX behind the scenes, it integrates seamlessly with [mobx](https://mobx.js.org) and [mobx-react](github.com/mobxjs/mobx-react).
+Since MST uses MobX behind the scenes, it integrates seamlessly with [mobx](https://mobx.js.org) and [mobx-react](https://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.
@@ -209,3 +209,3 @@ 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).
     findTodosByUser(user) {                       // 7
-        return this.todos.filter(t => t.assignee = user)
+        return this.todos.filter(t => t.assignee === user)
     }
@@ -360,2 +360,3 @@ }, {
 -   A single mutation can result in multiple patches, for example when splicing an array
+-   Patches can be reverse applied, which enables many powerful patterns like undo / redo
 
@@ -365,3 +366,4 @@ Useful methods:
 -   `onPatch(model, listener)` attaches a patch listener  to the provided model, which will be invoked whenever the model or any of its descendants is mutated
--   `applyPatch(model, patch)` applies a patch to the provided model
+-   `applyPatch(model, patch)` applies a patch (or array of patches) to the provided model
+-   `revertPatch(model, patch)` reverse applies a patch (or array of patches) to the provided model, this replays the inverse of a set of patches to an model, which can be used to bring it back to it's original state
 
@@ -626,3 +628,3 @@ ### References and identifiers
 | `applyAction(node, actionDescription)` | Replays an action on the targeted node |
-| `applyPatch(node, jsonPatch)` | Applies a JSON patch to a node in the tree |
+| `applyPatch(node, jsonPatch)` | Applies a JSON patch or array of patches to a node in the tree |
 | `applySnapshot(node, snapshot)` | Updates a node with the given snapshot |
@@ -656,2 +658,3 @@ | `asReduxStore(node)` | Wraps a node in a Redux store compatible api |
 | `resolve(node, path)` | Resolves a `path` (json path) relatively to the given `node` |
+| `revertPatch(node, jsonPatch)` | Inverse applies a JSON patch or array of patches to a node in the tree |
 | `splitJsonPath(path)` | Splits and unescapes the given json path into path parts |
@@ -658,0 +661,0 @@ | `tryResolve(node, path)` | Like `resolve`, but just returns `null` if resolving fails at any point in the path |

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Improved metrics

Total package byte prevSize

397007

increased by2.42%

Lines of code

7137

increased by2.26%

Number of lines in readme file

802

increased by0.38%

No dependency changes