feat(babel): alternative setup babel/typescript

Author: wtho

CHANGELOG.md

@@ -1,5 +1,8 @@
 ## Changelog (master)
 
+#### Features
+* (**BREAKING?**): Add preset `babel` as transpilation alternative to `ts-jest` ([#317](https://github.com/thymikee/jest-preset-angular/pull/317)). 
+
 ### v8.0.0
 
 #### Features

babel/babel.config.js

@@ -0,0 +1,13 @@
+module.exports = api => ({
+  presets: [
+    '@babel/preset-env',
+    '@babel/preset-typescript'
+  ],
+  plugins: [
+    ['@babel/plugin-proposal-decorators', {legacy: true}],
+    ['babel-plugin-transform-typescript-metadata', {loose: true}],
+    ['@babel/plugin-proposal-class-properties', {loose: true}],
+    ['jest-preset-angular/babel/inline-template.plugin'],
+    ['const-enum']
+  ]
+});

babel/inline-template.plugin.js

@@ -0,0 +1,22 @@
+const { types } = require('@babel/core')
+
+module.exports = (_api) => ({
+  visitor: {
+    ObjectProperty(path) {
+      const node = path.node
+      if (!types.isIdentifier(node.key)) return
+      if (node.key.name !== 'templateUrl') return
+      if (!types.isStringLiteral(node.value)) return
+      const requireIdentifier = types.identifier('require')
+      let templateUrl = node.value.value
+      if (!templateUrl.match(/^(\.\/|\.\.\/|\/)/)) {
+        templateUrl = `./${templateUrl}`
+      }
+      const templateUrlStringLiteral = types.stringLiteral(templateUrl)
+      const templateCallExpr = types.callExpression(requireIdentifier, [templateUrlStringLiteral])
+      const templateIdentifier = types.identifier('template')
+      const templateProperty = types.objectProperty(templateIdentifier, templateCallExpr)
+      path.replaceWith(templateProperty)
+    }
+  }
+})

babel/jest-preset.js

@@ -0,0 +1,20 @@
+module.exports = {
+  transform: {
+    '^.+\\.(html)$': 'jest-preset-angular/babel/load-html-transformer',
+    '^.+\\.(ts|js)$': 'babel-jest'
+  },
+  testEnvironment: 'jest-environment-jsdom-fifteen',
+  moduleFileExtensions: ['ts', 'html', 'js', 'json'],
+  moduleNameMapper: {
+    '^src/(.*)$': '<rootDir>/src/$1',
+    '^app/(.*)$': '<rootDir>/src/app/$1',
+    '^assets/(.*)$': '<rootDir>/src/assets/$1',
+    '^environments/(.*)$': '<rootDir>/src/environments/$1',
+  },
+  transformIgnorePatterns: ['node_modules/(?!@ngrx)'],
+  snapshotSerializers: [
+    'jest-preset-angular/build/AngularNoNgAttributesSnapshotSerializer.js',
+    'jest-preset-angular/build/AngularSnapshotSerializer.js',
+    'jest-preset-angular/build/HTMLCommentSerializer.js',
+  ],
+};

babel/load-html-transformer.js

@@ -0,0 +1,3 @@
+module.exports = {
+  process: src => ({ code: `module.exports=`+JSON.stringify(src) })
+};

example/babel.config.js

@@ -0,0 +1,6 @@
+const babelAngularConfig = require('jest-preset-angular/babel/babel.config')
+module.exports = api => {
+  api.cache(true)
+  return babelAngularConfig(api)
+}
+

example/jest.config.js

@@ -1,5 +1,5 @@
 module.exports = {
-  preset: "jest-preset-angular",
+  preset: "jest-preset-angular/babel",
   snapshotSerializers: [
     "jest-preset-angular/build/AngularNoNgAttributesSnapshotSerializer.js",
     "jest-preset-angular/build/AngularSnapshotSerializer.js",

example/package.json

@@ -30,10 +30,19 @@
     "@angular/cli": "~8.3.4",
     "@angular/compiler-cli": "~8.2.5",
     "@angular/language-service": "~8.2.5",
+    "@babel/core": "^7.6.2",
+    "@babel/plugin-proposal-class-properties": "^7.5.5",
+    "@babel/plugin-proposal-decorators": "^7.6.0",
+    "@babel/preset-env": "^7.6.2",
+    "@babel/preset-typescript": "^7.6.0",
     "@types/jest": "^24.0.0",
     "@types/node": "^11.0.0",
+    "babel-jest": "^24.9.0",
+    "babel-plugin-const-enum": "^0.0.2",
+    "babel-plugin-transform-typescript-metadata": "^0.2.2",
     "jest": "^24.0.0",
     "jest-preset-angular": "file:../",
+    "ts-jest": "^24.1.0",
     "ts-node": "^8.0.3",
     "typescript": "~3.5.3"
   }

example/src/app/hero-category/hero-category.service.ts

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+import { Injectable } from "@angular/core";
+import { HeroCategory, HeroColor } from "./hero-properties";
+
+@Injectable({
+  providedIn: "root"
+})
+export class HeroCategoryService {
+  getCategoryForHero(heroName: string): HeroCategory {
+    switch (heroName) {
+      case "Joker":
+        return HeroCategory.Evil;
+      case "Batman":
+        return HeroCategory.Good;
+      default:
+        return HeroCategory.Neutral;
+    }
+  }
+
+  getColorForHero(heroName: string): HeroColor {
+    switch (heroName) {
+      case "Joker":
+        return HeroColor.Purple;
+      case "Batman":
+        return HeroColor.Black;
+      case "Catwoman":
+        return HeroColor.Black;
+      default:
+        return HeroColor.Transparent;
+    }
+  }
+}

example/src/app/hero-category/hero-category.spec.ts

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+import { async } from "@angular/core/testing";
+
+import { HeroCategoryService } from "./hero-category.service";
+import { HeroCategory, HeroColor } from './hero-properties';
+
+describe("HeroCategoryService", () => {
+  let service: HeroCategoryService;
+
+  beforeEach(() => (service = new HeroCategoryService()));
+
+  it("should create", () => {
+    expect(service).toBeTruthy();
+  });
+
+  it("should return the right category for heroes", () => {
+    expect(service.getCategoryForHero("Batman")).toEqual(HeroCategory.Good);
+    expect(service.getCategoryForHero("Joker")).toEqual(HeroCategory.Evil);
+    expect(service.getCategoryForHero("Catwoman")).toEqual(HeroCategory.Neutral);
+  });
+
+  it("should return the right color for heroes", () => {
+    expect(service.getColorForHero("Batman")).toEqual(HeroColor.Black);
+    expect(service.getColorForHero("Joker")).toEqual(HeroColor.Purple);
+    expect(service.getColorForHero("The Penguin")).toEqual(HeroColor.Transparent);
+  });
+
+});

example/src/app/hero-category/hero-properties.ts

@@ -0,0 +1,12 @@
+
+export enum HeroCategory {
+  Evil,
+  Good,
+  Neutral
+}
+
+export const enum HeroColor {
+  Black = "#000000",
+  Purple = "#551A8B",
+  Transparent = "#00000000"
+}