feat(query): add query persistence functionality

- Create angular-query-persist-client-package
- Implement providePersistQueryClient in new package
- Add isRestoring provider and injection token to main angular-query package
- Include example of persister package usage

examples/angular/persister/.devcontainer/devcontainer.json

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+{
+  "name": "Node.js",
+  "image": "mcr.microsoft.com/devcontainers/javascript-node:18"
+}

examples/angular/persister/.eslintrc.cjs

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+// @ts-check
+
+/** @type {import('eslint').Linter.Config} */
+const config = {}
+
+module.exports = config

examples/angular/persister/README.md

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+# Angular Query persister example
+
+To run this example:
+
+- `npm install` or `yarn` or `pnpm i` or `bun i`
+- `npm run start` or `yarn start` or `pnpm start` or `bun start`

examples/angular/persister/angular.json

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+{
+  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
+  "version": 1,
+  "cli": {
+    "packageManager": "pnpm",
+    "analytics": false,
+    "cache": {
+      "enabled": false
+    }
+  },
+  "newProjectRoot": "projects",
+  "projects": {
+    "basic": {
+      "projectType": "application",
+      "schematics": {
+        "@schematics/angular:component": {
+          "inlineTemplate": true,
+          "inlineStyle": true,
+          "skipTests": true
+        },
+        "@schematics/angular:class": {
+          "skipTests": true
+        },
+        "@schematics/angular:directive": {
+          "skipTests": true
+        },
+        "@schematics/angular:guard": {
+          "skipTests": true
+        },
+        "@schematics/angular:interceptor": {
+          "skipTests": true
+        },
+        "@schematics/angular:pipe": {
+          "skipTests": true
+        },
+        "@schematics/angular:resolver": {
+          "skipTests": true
+        },
+        "@schematics/angular:service": {
+          "skipTests": true
+        }
+      },
+      "root": "",
+      "sourceRoot": "src",
+      "prefix": "app",
+      "architect": {
+        "build": {
+          "builder": "@angular-devkit/build-angular:application",
+          "options": {
+            "outputPath": "dist/basic",
+            "index": "src/index.html",
+            "browser": "src/main.ts",
+            "polyfills": ["zone.js"],
+            "tsConfig": "tsconfig.app.json",
+            "assets": ["src/favicon.ico", "src/assets"],
+            "styles": [],
+            "scripts": []
+          },
+          "configurations": {
+            "production": {
+              "budgets": [
+                {
+                  "type": "initial",
+                  "maximumWarning": "500kb",
+                  "maximumError": "1mb"
+                },
+                {
+                  "type": "anyComponentStyle",
+                  "maximumWarning": "2kb",
+                  "maximumError": "4kb"
+                }
+              ],
+              "outputHashing": "all"
+            },
+            "development": {
+              "optimization": false,
+              "extractLicenses": false,
+              "sourceMap": true
+            }
+          },
+          "defaultConfiguration": "production"
+        },
+        "serve": {
+          "builder": "@angular-devkit/build-angular:dev-server",
+          "configurations": {
+            "production": {
+              "buildTarget": "basic:build:production"
+            },
+            "development": {
+              "buildTarget": "basic:build:development"
+            }
+          },
+          "defaultConfiguration": "development"
+        },
+        "extract-i18n": {
+          "builder": "@angular-devkit/build-angular:extract-i18n",
+          "options": {
+            "buildTarget": "basic:build"
+          }
+        }
+      }
+    }
+  }
+}

examples/angular/persister/package.json

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+{
+  "name": "@tanstack/query-example-angular-persister",
+  "type": "module",
+  "scripts": {
+    "ng": "ng",
+    "start": "ng serve",
+    "build": "ng build",
+    "watch": "ng build --watch --configuration development"
+  },
+  "private": true,
+  "dependencies": {
+    "@angular/common": "^17.3.12",
+    "@angular/compiler": "^17.3.12",
+    "@angular/core": "^17.3.12",
+    "@angular/forms": "^18.2.8",
+    "@angular/platform-browser": "^17.3.12",
+    "@angular/platform-browser-dynamic": "^17.3.12",
+    "@angular/router": "^17.3.12",
+    "@tanstack/angular-query-experimental": "^5.54.1",
+    "@tanstack/angular-query-persist-client-experimental": "^5.54.1",
+    "@tanstack/query-sync-storage-persister": "^5.54.1",
+    "rxjs": "^7.8.1",
+    "tslib": "^2.6.3",
+    "zone.js": "^0.14.8"
+  },
+  "devDependencies": {
+    "@angular-devkit/build-angular": "^17.3.8",
+    "@angular/cli": "^17.3.8",
+    "@angular/compiler-cli": "^17.3.12",
+    "@tanstack/angular-query-devtools-experimental": "^5.54.1",
+    "typescript": "5.3.3"
+  },
+  "msw": {
+    "workerDirectory": [
+      "src"
+    ]
+  }
+}

examples/angular/persister/src/app/app.component.ts

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+import { ChangeDetectionStrategy, Component } from '@angular/core'
+import { RouterOutlet } from '@angular/router'
+import { AngularQueryDevtools } from '@tanstack/angular-query-devtools-experimental'
+import { injectIsRestoring } from '@tanstack/angular-query-experimental'
+
+@Component({
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  selector: 'root',
+  standalone: true,
+  template: `
+    <h1>Angular Query - Persister</h1>
+    <p>
+      Try to mock offline behavior with the button in the devtools. You can
+      navigate around as long as there is already data in the cache. You'll get
+      a refetch as soon as you go "online" again.
+    </p>
+    <router-outlet />
+    <angular-query-devtools initialIsOpen />
+  `,
+  imports: [AngularQueryDevtools, RouterOutlet],
+})
+export class AppComponent {
+  isRestoring = injectIsRestoring()
+}

examples/angular/persister/src/app/app.config.ts

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+import { provideHttpClient, withFetch } from '@angular/common/http'
+import { QueryClient } from '@tanstack/angular-query-experimental'
+import { provideRouter, withComponentInputBinding } from '@angular/router'
+import { providePersistAngularQuery } from '@tanstack/angular-query-persist-client-experimental'
+import { createSyncStoragePersister } from '@tanstack/query-sync-storage-persister'
+import type { Route } from '@angular/router'
+import type { ApplicationConfig } from '@angular/core'
+
+export const routes: Array<Route> = [
+  {
+    path: '',
+    loadComponent: () => import('./posts/posts.component'),
+  },
+  {
+    path: 'posts/:postId',
+    loadComponent: () => import('./posts/post.component'),
+  },
+]
+
+const queryClient = new QueryClient({
+  defaultOptions: {
+    queries: {
+      gcTime: 1000 * 60 * 60 * 24, // 24 hours
+      staleTime: 2000,
+    },
+  },
+})
+
+const persister = createSyncStoragePersister({
+  storage: window.localStorage,
+})
+
+export const appConfig: ApplicationConfig = {
+  providers: [
+    provideHttpClient(withFetch()),
+    providePersistAngularQuery(queryClient, [{ persister }]),
+    provideRouter(routes, withComponentInputBinding()),
+  ],
+}

examples/angular/persister/src/app/posts/post.component.html

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+<div>
+  <div>
+    <a [routerLink]="['../../']"> Back </a>
+  </div>
+  @if (postQuery.status() === 'pending') {
+    Loading...
+  } @else if (postQuery.status() === 'error') {
+    Error: {{ postQuery.error?.()?.message }}
+  }
+  @if (postQuery.data(); as post) {
+    <h1>{{ post.title }}</h1>
+    <div>
+      <p>{{ post.body }}</p>
+    </div>
+    @if (postQuery.isFetching()) {
+      Background Updating...
+    }
+  }
+</div>

examples/angular/persister/src/app/posts/post.component.ts

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+import {
+  ChangeDetectionStrategy,
+  Component,
+  inject,
+  input,
+} from '@angular/core'
+import { injectQuery } from '@tanstack/angular-query-experimental'
+import { fromEvent, lastValueFrom, takeUntil } from 'rxjs'
+import { RouterLink } from '@angular/router'
+import { PostsService } from './posts.service'
+
+@Component({
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  selector: 'post',
+  standalone: true,
+  templateUrl: './post.component.html',
+  imports: [RouterLink],
+})
+export default class PostComponent {
+  #postsService = inject(PostsService)
+
+  postId = input(0)
+
+  postQuery = injectQuery(() => ({
+    enabled: this.postId() > 0,
+    queryKey: ['post', this.postId()],
+    queryFn: async (context) => {
+      // Cancels the request when component is destroyed before the request finishes
+      const abort$ = fromEvent(context.signal, 'abort')
+      return lastValueFrom(
+        this.#postsService.postById$(this.postId()).pipe(takeUntil(abort$)),
+      )
+    },
+  }))
+}

examples/angular/persister/src/app/posts/posts.component.html

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+<div>
+  <h1>Posts</h1>
+  @switch (postsQuery.status()) {
+    @case ('pending') {
+      Loading...
+    }
+    @case ('error') {
+      Error: {{ postsQuery.error?.()?.message }}
+    }
+    @default {
+      <div class="todo-container">
+        @for (post of postsQuery.data(); track post.id) {
+          <p>
+            <a
+              [routerLink]="['posts', post.id]"
+              [ngStyle]="
+                queryClient.getQueryData(['post', post.id.toString()])
+                  ? {
+                      fontWeight: 'bold',
+                      color: 'green',
+                    }
+                  : {}
+              "
+              >{{ post.title }}</a
+            >
+          </p>
+        }
+      </div>
+    }
+  }
+  <div>
+    @if (postsQuery.isFetching()) {
+      Background Updating...
+    }
+  </div>
+</div>

examples/angular/persister/src/app/posts/posts.component.ts

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+import { ChangeDetectionStrategy, Component, inject } from '@angular/core'
+import { RouterLink } from '@angular/router'
+import { NgStyle } from '@angular/common'
+import {
+  injectQuery,
+  injectQueryClient,
+} from '@tanstack/angular-query-experimental'
+import { lastValueFrom } from 'rxjs'
+import { PostsService } from './posts.service'
+
+@Component({
+  changeDetection: ChangeDetectionStrategy.OnPush,
+  selector: 'posts',
+  standalone: true,
+  templateUrl: './posts.component.html',
+  imports: [RouterLink, NgStyle],
+})
+export default class PostsComponent {
+  #postsService = inject(PostsService)
+
+  postsQuery = injectQuery(() => ({
+    queryKey: ['posts'],
+    queryFn: () => lastValueFrom(this.#postsService.allPosts$()),
+  }))
+  queryClient = injectQueryClient()
+}

examples/angular/persister/src/app/posts/posts.service.ts

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+import { HttpClient } from '@angular/common/http'
+import { Injectable, inject } from '@angular/core'
+
+@Injectable({
+  providedIn: 'root',
+})
+export class PostsService {
+  #http = inject(HttpClient)
+
+  postById$ = (postId: number) =>
+    this.#http.get<Post>(`https://jsonplaceholder.typicode.com/posts/${postId}`)
+
+  allPosts$ = () =>
+    this.#http.get<Array<Post>>('https://jsonplaceholder.typicode.com/posts')
+}
+
+export interface Post {
+  id: number
+  title: string
+  body: string
+}

examples/angular/persister/src/index.html

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+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <title>Angular Query basic example</title>
+    <base href="/" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <link rel="icon" type="image/x-icon" href="favicon.ico" />
+  </head>
+  <body>
+    <root />
+  </body>
+</html>

examples/angular/persister/src/main.ts

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+import { bootstrapApplication } from '@angular/platform-browser'
+import { appConfig } from './app/app.config'
+import { AppComponent } from './app/app.component'
+
+bootstrapApplication(AppComponent, appConfig).catch((err) => console.error(err))

examples/angular/persister/tsconfig.app.json

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+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "./out-tsc/app",
+    "types": []
+  },
+  "files": ["src/main.ts"],
+  "include": ["src/**/*.d.ts"]
+}