challenge 51: signal effect trigger too often (#855)

* feat: challenge 51

* fix: permission denied

apps/signal/51-function-call-effect/.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/signal/51-function-call-effect/README.md

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+# Function call in effect
+
+> author: thomas-laforge
+
+### Run Application
+
+```bash
+npx nx serve signal-function-call-effect
+```
+
+### Documentation and Instruction
+
+Challenge documentation is [here](https://angular-challenges.vercel.app/challenges/angular/51-function-call-effect/).

apps/signal/51-function-call-effect/project.json

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+{
+  "name": "signal-function-call-effect",
+  "$schema": "../../../node_modules/nx/schemas/project-schema.json",
+  "projectType": "application",
+  "prefix": "app",
+  "sourceRoot": "apps/signal/51-function-call-effect/src",
+  "tags": [],
+  "targets": {
+    "build": {
+      "executor": "@angular-devkit/build-angular:application",
+      "outputs": ["{options.outputPath}"],
+      "options": {
+        "outputPath": "dist/apps/signal/51-function-call-effect",
+        "index": "apps/signal/51-function-call-effect/src/index.html",
+        "browser": "apps/signal/51-function-call-effect/src/main.ts",
+        "polyfills": ["zone.js"],
+        "tsConfig": "apps/signal/51-function-call-effect/tsconfig.app.json",
+        "inlineStyleLanguage": "scss",
+        "assets": [
+          "apps/signal/51-function-call-effect/src/favicon.ico",
+          "apps/signal/51-function-call-effect/src/assets"
+        ],
+        "styles": ["apps/signal/51-function-call-effect/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": "signal-function-call-effect:build:production"
+        },
+        "development": {
+          "buildTarget": "signal-function-call-effect:build:development"
+        }
+      },
+      "defaultConfiguration": "development"
+    },
+    "extract-i18n": {
+      "executor": "@angular-devkit/build-angular:extract-i18n",
+      "options": {
+        "buildTarget": "signal-function-call-effect:build"
+      }
+    },
+    "lint": {
+      "executor": "@nx/eslint:lint"
+    }
+  }
+}

apps/signal/51-function-call-effect/src/app/action.component.ts

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+import {
+  ChangeDetectionStrategy,
+  Component,
+  effect,
+  inject,
+  signal,
+} from '@angular/core';
+import { FormsModule } from '@angular/forms';
+import { UserService } from './user.service';
+
+@Component({
+  standalone: true,
+  imports: [FormsModule],
+  selector: 'app-actions',
+  template: `
+    <form class="mx-auto max-w-sm">
+      <label for="actions" class="mb-2 block text-sm font-medium text-gray-900">
+        Choose an action
+      </label>
+      <select
+        name="actions"
+        [(ngModel)]="action"
+        id="actions"
+        class="block w-full rounded-lg border border-gray-300 bg-gray-50 p-2.5 text-sm text-gray-900 focus:border-blue-500 focus:ring-blue-500">
+        <option selected>Please select an action</option>
+        @for (action of actions; track $index) {
+          <option value="{{ action }}">{{ action }}</option>
+        }
+      </select>
+    </form>
+  `,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export class ActionsComponent {
+  private userService = inject(UserService);
+  protected action = signal(undefined);
+
+  protected actions = ['Create', 'Read', 'Update', 'Delete'];
+
+  constructor() {
+    effect(() => {
+      this.userService.log(this.action() ?? 'No action selected');
+    });
+  }
+}

apps/signal/51-function-call-effect/src/app/app.component.ts

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+import { ChangeDetectionStrategy, Component, inject } from '@angular/core';
+import { FormsModule } from '@angular/forms';
+import { ActionsComponent } from './action.component';
+import { UserService } from './user.service';
+
+@Component({
+  standalone: true,
+  imports: [FormsModule, ActionsComponent],
+  selector: 'app-root',
+  template: `
+    <nav class="flex w-full items-center border border-b">
+      Profile selected:
+      <form class="m-4 w-48">
+        <select
+          [(ngModel)]="userService.name"
+          name="name"
+          class="block w-full rounded-lg border border-gray-300 bg-gray-50 p-2.5 text-sm text-gray-900 focus:border-blue-500 focus:ring-blue-500 ">
+          <option selected>Please choose an user</option>
+          @for (user of users; track $index) {
+            <option value="{{ user }}">{{ user }}</option>
+          }
+        </select>
+      </form>
+    </nav>
+
+    <app-actions />
+  `,
+  changeDetection: ChangeDetectionStrategy.OnPush,
+})
+export class AppComponent {
+  protected userService = inject(UserService);
+
+  protected users = ['Thomas', 'John', 'Alice', 'Bob', 'Charlie', 'David'];
+}

apps/signal/51-function-call-effect/src/app/app.config.ts

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+import { ApplicationConfig } from '@angular/core';
+
+export const appConfig: ApplicationConfig = {
+  providers: [],
+};

apps/signal/51-function-call-effect/src/app/user.service.ts

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+import { Injectable, signal } from '@angular/core';
+
+@Injectable({ providedIn: 'root' })
+export class UserService {
+  name = signal('Thomas');
+
+  log(message: string) {
+    console.log(`${this.name()}: ${message}`);
+  }
+}

apps/signal/51-function-call-effect/src/index.html

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+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <title>angular-function-call-effect</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/signal/51-function-call-effect/src/main.ts

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

apps/signal/51-function-call-effect/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/signal/51-function-call-effect/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/signal/51-function-call-effect/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/signal/51-function-call-effect/tsconfig.editor.json

@@ -0,0 +1,6 @@
+{
+  "extends": "./tsconfig.json",
+  "include": ["src/**/*.ts"],
+  "compilerOptions": {},
+  "exclude": ["jest.config.ts", "src/**/*.test.ts", "src/**/*.spec.ts"]
+}

apps/signal/51-function-call-effect/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"
+    }
+  ],
+  "extends": "../../../tsconfig.base.json",
+  "angularCompilerOptions": {
+    "enableI18nLegacyMessageIdFormat": false,
+    "strictInjectionParameters": true,
+    "strictInputAccessModifiers": true,
+    "strictTemplates": true
+  }
+}