feat(utils): add utils library with a fake ramdon generator

apps/rxjs-pipe-bug/project.json

@@ -20,7 +20,8 @@
           "apps/rxjs-pipe-bug/src/assets"
         ],
         "styles": ["apps/rxjs-pipe-bug/src/styles.scss"],
-        "scripts": []
+        "scripts": [],
+        "allowedCommonJsDependencies": ["seedrandom"]
       },
       "configurations": {
         "production": {

apps/rxjs-pipe-bug/src/app/localDB.service.ts

@@ -1,6 +1,6 @@
 /* eslint-disable @typescript-eslint/member-ordering */
+import { randomError } from '@angular-challenges/shared/utils';
 import { Injectable } from '@angular/core';
-import { randNumber } from '@ngneat/falso';
 import { ComponentStore } from '@ngrx/component-store';
 import { of } from 'rxjs';
 
@@ -47,12 +47,12 @@ export class LocalDBService extends ComponentStore<DBState> {
     })
   );
 
-  deleteOneTopic = (id: number) => {
-    const randomNumber = randNumber({ min: 0.1, max: 1, fraction: 2 });
-    if (randomNumber > 0.5) {
+  deleteOneTopic = (id: number) =>
+    randomError({
+      success: () => {
         this.deleteOne(id);
         return of(true);
-    }
-    return of(false);
-  };
+      },
+      error: () => of(false),
+    });
 }

libs/shared/utils/.eslintrc.json

@@ -0,0 +1,36 @@
+{
+  "extends": ["../../../.eslintrc.json"],
+  "ignorePatterns": ["!**/*"],
+  "overrides": [
+    {
+      "files": ["*.ts"],
+      "rules": {
+        "@angular-eslint/directive-selector": [
+          "error",
+          {
+            "type": "attribute",
+            "prefix": "angularChallenges",
+            "style": "camelCase"
+          }
+        ],
+        "@angular-eslint/component-selector": [
+          "error",
+          {
+            "type": "element",
+            "prefix": "angular-challenges",
+            "style": "kebab-case"
+          }
+        ]
+      },
+      "extends": [
+        "plugin:@nrwl/nx/angular",
+        "plugin:@angular-eslint/template/process-inline-templates"
+      ]
+    },
+    {
+      "files": ["*.html"],
+      "extends": ["plugin:@nrwl/nx/angular-template"],
+      "rules": {}
+    }
+  ]
+}

libs/shared/utils/README.md

@@ -0,0 +1,7 @@
+# shared-utils
+
+This library was generated with [Nx](https://nx.dev).
+
+## Running unit tests
+
+Run `nx test shared-utils` to execute the unit tests.

libs/shared/utils/jest.config.ts

@@ -0,0 +1,22 @@
+/* eslint-disable */
+export default {
+  displayName: 'shared-utils',
+  preset: '../../../jest.preset.js',
+  setupFilesAfterEnv: ['<rootDir>/src/test-setup.ts'],
+  globals: {
+    'ts-jest': {
+      tsconfig: '<rootDir>/tsconfig.spec.json',
+      stringifyContentPathRegex: '\\.(html|svg)$',
+    },
+  },
+  coverageDirectory: '../../../coverage/libs/shared/utils',
+  transform: {
+    '^.+\\.(ts|mjs|js|html)$': 'jest-preset-angular',
+  },
+  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',
+  ],
+};

libs/shared/utils/project.json

@@ -0,0 +1,28 @@
+{
+  "name": "shared-utils",
+  "$schema": "../../../node_modules/nx/schemas/project-schema.json",
+  "projectType": "library",
+  "sourceRoot": "libs/shared/utils/src",
+  "prefix": "angular-challenges",
+  "targets": {
+    "test": {
+      "executor": "@nrwl/jest:jest",
+      "outputs": ["{workspaceRoot}/coverage/{projectRoot}"],
+      "options": {
+        "jestConfig": "libs/shared/utils/jest.config.ts",
+        "passWithNoTests": true
+      }
+    },
+    "lint": {
+      "executor": "@nrwl/linter:eslint",
+      "outputs": ["{options.outputFile}"],
+      "options": {
+        "lintFilePatterns": [
+          "libs/shared/utils/**/*.ts",
+          "libs/shared/utils/**/*.html"
+        ]
+      }
+    }
+  },
+  "tags": []
+}

libs/shared/utils/src/index.ts

@@ -0,0 +1 @@
+export * from './lib/random-http-error.utils';

libs/shared/utils/src/lib/random-http-error.utils.ts

@@ -0,0 +1,24 @@
+import { randNumber } from '@ngneat/falso';
+
+/**
+ * Execute success function if value is above threshold and error function otherwise
+ * Success and error function should return the same ReturnType
+ * @param success
+ * @param error
+ * @param threashold default to 0.5
+ */
+export const randomError = <T>({
+  success,
+  error,
+  threashold,
+}: {
+  success: () => T;
+  error: () => T;
+  threashold?: number;
+}): T => {
+  const randomNumber = randNumber({ min: 0.1, max: 1, fraction: 2 });
+  if (randomNumber > (threashold ?? 0.5)) {
+    return success();
+  }
+  return error();
+};

libs/shared/utils/src/test-setup.ts

@@ -0,0 +1 @@
+import 'jest-preset-angular/setup-jest';

libs/shared/utils/tsconfig.json

@@ -0,0 +1,29 @@
+{
+  "compilerOptions": {
+    "target": "es2022",
+    "useDefineForClassFields": false,
+    "forceConsistentCasingInFileNames": true,
+    "strict": true,
+    "noImplicitOverride": true,
+    "noPropertyAccessFromIndexSignature": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true
+  },
+  "files": [],
+  "include": [],
+  "references": [
+    {
+      "path": "./tsconfig.lib.json"
+    },
+    {
+      "path": "./tsconfig.spec.json"
+    }
+  ],
+  "extends": "../../../tsconfig.base.json",
+  "angularCompilerOptions": {
+    "enableI18nLegacyMessageIdFormat": false,
+    "strictInjectionParameters": true,
+    "strictInputAccessModifiers": true,
+    "strictTemplates": true
+  }
+}

libs/shared/utils/tsconfig.lib.json

@@ -0,0 +1,17 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "../../../dist/out-tsc",
+    "declaration": true,
+    "declarationMap": true,
+    "inlineSources": true,
+    "types": []
+  },
+  "exclude": [
+    "src/test-setup.ts",
+    "src/**/*.spec.ts",
+    "jest.config.ts",
+    "src/**/*.test.ts"
+  ],
+  "include": ["src/**/*.ts"]
+}

libs/shared/utils/tsconfig.spec.json

@@ -0,0 +1,15 @@
+{
+  "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"
+  ]
+}

tsconfig.base.json

@@ -21,6 +21,7 @@
       "@angular-challenges/ngrx-notification/model": [
         "libs/ngrx-notification/model/src/index.ts"
       ],
+      "@angular-challenges/shared/utils": ["libs/shared/utils/src/index.ts"],
       "@tomalaforge/ngrx-callstate-store": [
         "libs/shared/ngrx-callstate-store/src/index.ts"
       ]