Additions/52 lazy load component (#963)

* feat: create challenge 52 on lazy load component

Initial boilerplate from `nx g @angular-challenges/cli:challenge`

* feat: revert to NgModule

Copy of 31

* feat: initial version of starting point

* feat: add documentation

* feat: pr tweaks

Add author file
Remove thomas from the contributor list
Add a more direct hint

* feat: pr tweaks

Update "Go to the latest Challenge" link

apps/angular/52-lazy-load-component/.eslintrc.json

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

apps/angular/52-lazy-load-component/README.md

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+# lazy-load-component
+
+> author: thomas-laforge
+
+### Run Application
+
+```bash
+npx nx serve angular-lazy-load-component
+```
+
+### Documentation and Instruction
+
+Challenge documentation is [here](https://angular-challenges.vercel.app/challenges/angular/52-lazy-load-component/).

apps/angular/52-lazy-load-component/jest.config.ts

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+/* eslint-disable */
+export default {
+  displayName: 'angular-lazy-load-component',
+  preset: '../../../jest.preset.js',
+  setupFilesAfterEnv: ['<rootDir>/src/test-setup.ts'],
+  coverageDirectory: '../../../coverage/apps/angular/52-lazy-load-component',
+  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/angular/52-lazy-load-component/project.json

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+{
+  "name": "angular-lazy-load-component",
+  "$schema": "../../../node_modules/nx/schemas/project-schema.json",
+  "projectType": "application",
+  "prefix": "app",
+  "sourceRoot": "apps/angular/52-lazy-load-component/src",
+  "tags": [],
+  "targets": {
+    "build": {
+      "executor": "@angular-devkit/build-angular:application",
+      "outputs": ["{options.outputPath}"],
+      "options": {
+        "outputPath": "dist/apps/angular/52-lazy-load-component",
+        "index": "apps/angular/52-lazy-load-component/src/index.html",
+        "browser": "apps/angular/52-lazy-load-component/src/main.ts",
+        "polyfills": ["zone.js"],
+        "tsConfig": "apps/angular/52-lazy-load-component/tsconfig.app.json",
+        "inlineStyleLanguage": "scss",
+        "assets": [
+          "apps/angular/52-lazy-load-component/src/favicon.ico",
+          "apps/angular/52-lazy-load-component/src/assets"
+        ],
+        "styles": ["apps/angular/52-lazy-load-component/src/styles.scss"],
+        "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": {
+      "executor": "@angular-devkit/build-angular:dev-server",
+      "configurations": {
+        "production": {
+          "buildTarget": "angular-lazy-load-component:build:production"
+        },
+        "development": {
+          "buildTarget": "angular-lazy-load-component:build:development"
+        }
+      },
+      "defaultConfiguration": "development"
+    },
+    "extract-i18n": {
+      "executor": "@angular-devkit/build-angular:extract-i18n",
+      "options": {
+        "buildTarget": "angular-lazy-load-component:build"
+      }
+    },
+    "lint": {
+      "executor": "@nx/eslint:lint"
+    },
+    "test": {
+      "executor": "@nx/jest:jest",
+      "outputs": ["{workspaceRoot}/coverage/{projectRoot}"],
+      "options": {
+        "jestConfig": "apps/angular/52-lazy-load-component/jest.config.ts"
+      }
+    }
+  }
+}

apps/angular/52-lazy-load-component/src/app/app.component.ts

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+import { Component, signal } from '@angular/core';
+
+@Component({
+  selector: 'app-root',
+  template: `
+    <div class="h-screen bg-gray-500">
+      @if (topLoaded()) {
+        <app-top />
+      } @else {
+        <app-placeholder />
+        <button
+          class="rounded-sm border border-blue-500 bg-blue-300 p-2"
+          (click)="topLoaded.set(true)">
+          Load Top
+        </button>
+      }
+    </div>
+  `,
+})
+export class AppComponent {
+  topLoaded = signal(false);
+}

apps/angular/52-lazy-load-component/src/app/app.module.ts

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+import { NgModule } from '@angular/core';
+import { BrowserModule } from '@angular/platform-browser';
+import { AppComponent } from './app.component';
+import { PlaceholderComponent } from './placeholder.component';
+import { TopComponent } from './top.component';
+
+@NgModule({
+  declarations: [AppComponent, PlaceholderComponent, TopComponent],
+  imports: [BrowserModule],
+  bootstrap: [AppComponent],
+})
+export class AppModule {}

apps/angular/52-lazy-load-component/src/app/placeholder.component.ts

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+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'app-placeholder',
+  template: `
+    I'm a placeholder component.
+  `,
+  styles: `
+    :host {
+      display: grid;
+      padding: 20px;
+      background-color: #f0f0f0;
+      height: 50%;
+    }
+  `,
+})
+export class PlaceholderComponent {}

apps/angular/52-lazy-load-component/src/app/top.component.ts

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+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'app-top',
+  template: `
+    I am a very heavy, expensive component that should be lazy loaded.
+  `,
+  styles: `
+    :host {
+      display: grid;
+      padding: 20px;
+      background-color: #f0f0f0;
+      height: 50%;
+    }
+  `,
+})
+export class TopComponent {}

apps/angular/52-lazy-load-component/src/index.html

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+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <title>angular-lazy-load-component</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/angular/52-lazy-load-component/src/main.ts

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+import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
+import { AppModule } from './app/app.module';
+
+platformBrowserDynamic()
+  .bootstrapModule(AppModule)
+  .catch((err) => console.error(err));

apps/angular/52-lazy-load-component/src/styles.scss

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+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+/* You can add global styles to this file, and also import other style files */

apps/angular/52-lazy-load-component/src/test-setup.ts

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+import '@testing-library/jest-dom';
+import 'jest-preset-angular/setup-jest';

apps/angular/52-lazy-load-component/tailwind.config.js

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+const { createGlobPatternsForDependencies } = require('@nx/angular/tailwind');
+const { join } = require('path');
+
+/** @type {import('tailwindcss').Config} */
+module.exports = {
+  content: [
+    join(__dirname, 'src/**/!(*.stories|*.spec).{ts,html}'),
+    ...createGlobPatternsForDependencies(__dirname),
+  ],
+  theme: {
+    extend: {},
+  },
+  plugins: [],
+};

apps/angular/52-lazy-load-component/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/angular/52-lazy-load-component/tsconfig.editor.json

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+{
+  "extends": "./tsconfig.json",
+  "include": ["src/**/*.ts"],
+  "compilerOptions": {},
+  "exclude": ["jest.config.ts", "src/**/*.test.ts", "src/**/*.spec.ts"]
+}

apps/angular/52-lazy-load-component/tsconfig.json

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

apps/angular/52-lazy-load-component/tsconfig.spec.json

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