feat(doc): move scroll-vd

apps/performance/scroll-cd/.eslintrc.json

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+{
+  "extends": ["../../../.eslintrc.json"],
+  "ignorePatterns": ["!**/*"],
+  "overrides": [
+    {
+      "files": ["*.ts"],
+      "rules": {
+        "@angular-eslint/directive-selector": [
+          "error",
+          {
+            "type": "attribute",
+            "prefix": "app",
+            "style": "camelCase"
+          }
+        ],
+        "@angular-eslint/component-selector": [
+          "error",
+          {
+            "type": "element",
+            "prefix": "app",
+            "style": "kebab-case"
+          }
+        ]
+      },
+      "extends": [
+        "plugin:@nx/angular",
+        "plugin:@angular-eslint/template/process-inline-templates"
+      ]
+    },
+    {
+      "files": ["*.html"],
+      "extends": ["plugin:@nx/angular-template"],
+      "rules": {}
+    }
+  ]
+}

apps/performance/scroll-cd/README.md

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+# Optimize Change Detection
+
+> Author: Thomas Laforge
+
+### Run Application
+
+```bash
+npx nx serve performance-scroll-cd
+```
+
+### Documentation and Instruction
+
+Challenge documentation is [here](https://angular-challenges.vercel.app/challenges/angular-performance/12-performance-scroll-cd/).

apps/performance/scroll-cd/jest.config.ts

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+/* eslint-disable */
+export default {
+  displayName: 'performance-scroll-cd',
+  preset: '../../../jest.preset.js',
+  setupFilesAfterEnv: ['<rootDir>/src/test-setup.ts'],
+  globals: {},
+  coverageDirectory: '../../../coverage/apps/performance/scroll-cd',
+  transform: {
+    '^.+\\.(ts|mjs|js|html)$': [
+      'jest-preset-angular',
+      {
+        tsconfig: '<rootDir>/tsconfig.spec.json',
+        stringifyContentPathRegex: '\\.(html|svg)$',
+      },
+    ],
+  },
+  transformIgnorePatterns: ['node_modules/(?!.*\\.mjs$)'],
+  snapshotSerializers: [
+    'jest-preset-angular/build/serializers/no-ng-attributes',
+    'jest-preset-angular/build/serializers/ng-snapshot',
+    'jest-preset-angular/build/serializers/html-comment',
+  ],
+};

apps/performance/scroll-cd/project.json

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+{
+  "name": "performance-scroll-cd",
+  "$schema": "../../../node_modules/nx/schemas/project-schema.json",
+  "projectType": "application",
+  "sourceRoot": "apps/performance/scroll-cd/src",
+  "prefix": "app",
+  "targets": {
+    "build": {
+      "executor": "@angular-devkit/build-angular:browser",
+      "outputs": ["{options.outputPath}"],
+      "options": {
+        "outputPath": "dist/apps/performance/scroll-cd",
+        "index": "apps/performance/scroll-cd/src/index.html",
+        "main": "apps/performance/scroll-cd/src/main.ts",
+        "polyfills": ["zone.js"],
+        "tsConfig": "apps/performance/scroll-cd/tsconfig.app.json",
+        "inlineStyleLanguage": "scss",
+        "assets": [
+          "apps/performance/scroll-cd/src/favicon.ico",
+          "apps/performance/scroll-cd/src/assets"
+        ],
+        "styles": ["apps/performance/scroll-cd/src/styles.scss"],
+        "scripts": []
+      },
+      "configurations": {
+        "production": {
+          "budgets": [
+            {
+              "type": "initial",
+              "maximumWarning": "500kb",
+              "maximumError": "1mb"
+            },
+            {
+              "type": "anyComponentStyle",
+              "maximumWarning": "2kb",
+              "maximumError": "4kb"
+            }
+          ],
+          "outputHashing": "all"
+        },
+        "development": {
+          "buildOptimizer": false,
+          "optimization": false,
+          "vendorChunk": true,
+          "extractLicenses": false,
+          "sourceMap": true,
+          "namedChunks": true
+        }
+      },
+      "defaultConfiguration": "production"
+    },
+    "serve": {
+      "executor": "@angular-devkit/build-angular:dev-server",
+      "configurations": {
+        "production": {
+          "browserTarget": "performance-scroll-cd:build:production"
+        },
+        "development": {
+          "browserTarget": "performance-scroll-cd:build:development"
+        }
+      },
+      "defaultConfiguration": "development"
+    },
+    "extract-i18n": {
+      "executor": "@angular-devkit/build-angular:extract-i18n",
+      "options": {
+        "browserTarget": "performance-scroll-cd:build"
+      }
+    },
+    "lint": {
+      "executor": "@nx/linter:eslint",
+      "outputs": ["{options.outputFile}"],
+      "options": {
+        "lintFilePatterns": [
+          "apps/performance/scroll-cd/**/*.ts",
+          "apps/performance/scroll-cd/**/*.html"
+        ]
+      }
+    },
+    "test": {
+      "executor": "@nx/jest:jest",
+      "outputs": ["{workspaceRoot}/coverage/{projectRoot}"],
+      "options": {
+        "jestConfig": "apps/performance/scroll-cd/jest.config.ts",
+        "passWithNoTests": true
+      }
+    }
+  },
+  "tags": []
+}

apps/performance/scroll-cd/src/app/app.component.ts

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+import { AsyncPipe, NgIf } from '@angular/common';
+import { Component, HostListener } from '@angular/core';
+import { BehaviorSubject } from 'rxjs';
+
+@Component({
+  standalone: true,
+  imports: [NgIf, AsyncPipe],
+  selector: 'app-root',
+  template: `
+    <div>Top</div>
+    <div>Middle</div>
+    <div>Bottom</div>
+    <button (click)="goToTop()" *ngIf="displayButton$ | async">Top</button>
+  `,
+  styles: [
+    `
+      :host {
+        height: 1500px;
+        display: flex;
+        flex-direction: column;
+        justify-content: space-between;
+
+        button {
+          position: fixed;
+          bottom: 1rem;
+          left: 1rem;
+          z-index: 1;
+          padding: 1rem;
+        }
+      }
+    `,
+  ],
+})
+export class AppComponent {
+  title = 'scroll-cd';
+
+  private displayButtonSubject = new BehaviorSubject<boolean>(false);
+  displayButton$ = this.displayButtonSubject.asObservable();
+
+  @HostListener('window:scroll', ['$event'])
+  onScroll() {
+    const pos = window.pageYOffset;
+    this.displayButtonSubject.next(pos > 50);
+  }
+
+  goToTop() {
+    window.scroll({
+      top: 0,
+      left: 0,
+      behavior: 'smooth',
+    });
+  }
+}

apps/performance/scroll-cd/src/index.html

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+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <title>ScrollCd</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>
+    <app-root></app-root>
+  </body>
+</html>

apps/performance/scroll-cd/src/main.ts

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

apps/performance/scroll-cd/src/styles.scss

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+/* You can add global styles to this file, and also import other style files */

apps/performance/scroll-cd/src/test-setup.ts

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+import 'jest-preset-angular/setup-jest';

apps/performance/scroll-cd/tsconfig.app.json

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+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "../../../dist/out-tsc",
+    "types": []
+  },
+  "files": ["src/main.ts"],
+  "include": ["src/**/*.d.ts"],
+  "exclude": ["jest.config.ts", "src/**/*.test.ts", "src/**/*.spec.ts"]
+}

apps/performance/scroll-cd/tsconfig.editor.json

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+{
+  "extends": "./tsconfig.json",
+  "include": ["src/**/*.ts"],
+  "compilerOptions": {
+    "types": ["jest", "node"]
+  }
+}

apps/performance/scroll-cd/tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "es2022",
+    "useDefineForClassFields": false,
+    "forceConsistentCasingInFileNames": true,
+    "strict": true,
+    "noImplicitOverride": true,
+    "noPropertyAccessFromIndexSignature": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true
+  },
+  "files": [],
+  "include": [],
+  "references": [
+    {
+      "path": "./tsconfig.app.json"
+    },
+    {
+      "path": "./tsconfig.spec.json"
+    },
+    {
+      "path": "./tsconfig.editor.json"
+    }
+  ],
+  "extends": "../../../tsconfig.base.json",
+  "angularCompilerOptions": {
+    "enableI18nLegacyMessageIdFormat": false,
+    "strictInjectionParameters": true,
+    "strictInputAccessModifiers": true,
+    "strictTemplates": true
+  }
+}

apps/performance/scroll-cd/tsconfig.spec.json

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+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "../../../dist/out-tsc",
+    "module": "commonjs",
+    "types": ["jest", "node"]
+  },
+  "files": ["src/test-setup.ts"],
+  "include": [
+    "jest.config.ts",
+    "src/**/*.test.ts",
+    "src/**/*.spec.ts",
+    "src/**/*.d.ts"
+  ]
+}