feat(json-crdt): 🎸 add File.apply() method

Author: streamich

src/json-crdt/file/File.ts

@@ -12,6 +12,7 @@ import {CborEncoder} from '../../json-pack/cbor/CborEncoder';
 import {JsonEncoder} from '../../json-pack/json/JsonEncoder';
 import {printTree} from '../../util/print/printTree';
 import {decodeModel, decodeNdjsonComponents, decodePatch, decodeSeqCborComponents} from './util';
+import {Patch} from '../../json-crdt-patch';
 import type * as types from './types';
 import type {Printable} from '../../util/print/types';
 
@@ -68,6 +69,13 @@ export class File implements Printable {
 
   constructor(public readonly model: Model, public readonly log: PatchLog) {}
 
+  public apply(patch: Patch): void {
+    const id = patch.getId();
+    if (!id) return;
+    this.model.applyPatch(patch);
+    this.log.push(patch);
+  }
+
   public serialize(params: types.FileSerializeParams = {}): types.FileWriteSequence {
     if (params.noView && params.model === 'sidecar') throw new Error('SIDECAR_MODEL_WITHOUT_VIEW');
     const metadata: types.FileMetadata = [{}, FileModelEncoding.Auto];

src/json-crdt/file/__tests__/PatchLog.spec.ts

@@ -9,18 +9,20 @@ const setup = (view: unknown) => {
 };
 
 test('can replay to specific patch', () => {
-  const {model, file} = setup({foo: 'bar'});
+  const {file} = setup({foo: 'bar'});
+  const model = file.model.clone();
   model.api.obj([]).set({x: 1});
   const patch1 = model.api.flush();
   model.api.obj([]).set({y: 2});
   const patch2 = model.api.flush();
-  file.log.push(patch1);
-  file.log.push(patch2);
+  file.apply(patch1);
+  file.apply(patch2);
   const model2 = file.log.replayToEnd();
   const model3 = file.log.replayTo(patch1.getId()!);
   const model4 = file.log.replayTo(patch2.getId()!);
   expect(model.view()).toEqual({foo: 'bar', x: 1, y: 2});
-  expect(file.log.start.view()).toEqual({foo: 'bar'});
+  expect(file.model.view()).toEqual({foo: 'bar', x: 1, y: 2});
+  expect(file.log.start.view()).toEqual(undefined);
   expect(model2.view()).toEqual({foo: 'bar', x: 1, y: 2});
   expect(model3.view()).toEqual({foo: 'bar', x: 1});
   expect(model4.view()).toEqual({foo: 'bar', x: 1, y: 2});