Angular：仅在 ng build --prod 上构建 ES2015

Posted 2023-02-22

【中文标题】Angular：仅在 ng build --prod 上构建 ES2015

【英文标题】：Angular: Only building ES2015 on ng build --prod

【发布时间】：2019-11-28 03:31:48

【问题描述】：

我希望生产构建输出仅产生 ES2015 构建而不是 ES5 构建。

我正在使用带有 Ivy 渲染引擎的 Angular 8。

我还附上了我的 angular.json、browserslist、tsconfig.json 文件。

angular.json

  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "version": 1,
  "newProjectRoot": "projects",
  "projects": 
    "front-end-inventory": 
      "projectType": "application",
      "schematics": 
        "@schematics/angular:component": 
          "style": "scss"
        
      ,
      "root": "",
      "sourceRoot": "src",
      "prefix": "app",
      "architect": 
        "build": 
          "builder": "@angular-devkit/build-angular:browser",
          "options": 
            "outputPath": "dist/front-end-inventory",
            "index": "src/index.html",
            "main": "src/main.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "tsconfig.app.json",
            "aot": true,
            "assets": [
              "src/favicon.ico",
              "src/assets",
              "src/manifest.webmanifest",
              "src/.htaccess"
            ],
            "styles": [
              "./node_modules/@angular/material/prebuilt-themes/indigo-pink.css",
              "src/styles.scss"
            ],
            "scripts": [
              "./node_modules/jquery/dist/jquery.slim.min.js"
            ]
          ,
          "configurations": 
            "production": 
              "fileReplacements": [
                
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.prod.ts"
                
              ],
              "optimization": true,
              "outputHashing": "all",
              "sourceMap": false,
              "extractCss": true,
              "namedChunks": false,
              "aot": true,
              "extractLicenses": true,
              "vendorChunk": false,
              "buildOptimizer": true,
              "budgets": [
                
                  "type": "initial",
                  "maximumWarning": "2mb",
                  "maximumError": "5mb"
                
              ],
              "serviceWorker": true,
              "ngswConfigPath": "ngsw-config.json"
            ,
            "staging": 
              "fileReplacements": [
                
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.staging.ts"
                
              ],
              "optimization": true,
              "outputHashing": "all",
              "sourceMap": true,
              "extractCss": true,
              "namedChunks": false,
              "aot": true,
              "extractLicenses": true,
              "vendorChunk": false,
              "buildOptimizer": true,
              "budgets": [
                
                  "type": "initial",
                  "maximumWarning": "2mb",
                  "maximumError": "5mb"
                
              ],
              "serviceWorker": true,
              "ngswConfigPath": "ngsw-config.json"
            
          
        ,
        "serve": 
          "builder": "@angular-devkit/build-angular:dev-server",
          "options": 
            "browserTarget": "front-end-inventory:build"
          ,
          "configurations": 
            "production": 
              "browserTarget": "front-end-inventory:build:production"
            
          
        ,
        "extract-i18n": 
          "builder": "@angular-devkit/build-angular:extract-i18n",
          "options": 
            "browserTarget": "front-end-inventory:build"
          
        ,
        "test": 
          "builder": "@angular-devkit/build-angular:karma",
          "options": 
            "main": "src/test.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "tsconfig.spec.json",
            "karmaConfig": "karma.conf.js",
            "assets": [
              "src/favicon.ico",
              "src/assets",
              "src/manifest.webmanifest",
              "src/.htaccess"
            ],
            "styles": [
              "./node_modules/@angular/material/prebuilt-themes/indigo-pink.css",
              "src/styles.scss"
            ],
            "scripts": []
          
        ,
        "lint": 
          "builder": "@angular-devkit/build-angular:tslint",
          "options": 
            "tsConfig": [
              "tsconfig.app.json",
              "tsconfig.spec.json",
              "e2e/tsconfig.json"
            ],
            "exclude": [
              "**/node_modules/**"
            ]
          
        ,
        "e2e": 
          "builder": "@angular-devkit/build-angular:protractor",
          "options": 
            "protractorConfig": "e2e/protractor.conf.js",
            "devServerTarget": "front-end-inventory:serve"
          ,
          "configurations": 
            "production": 
              "devServerTarget": "front-end-inventory:serve:production"
            
          
        
      
    
  ,
  "defaultProject": "front-end-inventory"

浏览器列表

# This file is used by the build system to adjust CSS and JS output to support the specified browsers below.
# For additional information regarding the format and rule options, please see:
# https://github.com/browserslist/browserslist#queries

# You can see what browsers were selected by your queries by running:
#   npx browserslist

Chrome > 70

tsconfig.json

  "compileOnSave": false,
  "compilerOptions": 
    "baseUrl": "./",
    "outDir": "./dist/out-tsc",
    "sourceMap": true,
    "declaration": false,
    "downlevelIteration": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "module": "esnext",
    "moduleResolution": "node",
    "importHelpers": true,
    "target": "es2015",
    "noImplicitAny": true,
    "strictNullChecks": true,
    "typeRoots": [
      "node_modules/@types"
    ],
    "lib": [
      "es2018",
      "dom"
    ]
  

当前构建结果

当前构建创建文件，但 index.html 不使用类型模块，但我希望 index.html 仅使用模块脚本

当前 Index.html 结果

<script src="runtime.dd2d878cd9ae88476a26.js"></script>
<script src="polyfills.8ce2a1027d74b4930bab.js"></script>
<script src="scripts.b7617d15d290ae695226.js"></script>
<script src="main.c6dce3ad2ed82428de43.js"></script>

预期的 Index.html 结果

<script src="runtime.dd2d878cd9ae88476a26.js" type="module"></script>
<script src="polyfills.8ce2a1027d74b4930bab.js" type="module"></script>
<script src="scripts.b7617d15d290ae695226.js" type="module"></script>
<script src="main.c6dce3ad2ed82428de43.js" type="module"></script>

生成的构建脚本也不支持 ES2015。

旁注

如果将浏览器列表恢复为 Angular 提供的默认配置会产生 ES5 和 ES2015 的结果。

【问题讨论】：

我正在与类似的事情作斗争。我看到了可能有用的关于 ng build 的信息：“es5BrowserSupport - 已弃用：这将根据 'browserslist' 文件中指定的支持浏览器列表确定。 - 启用有条件加载的 ES2015 polyfills。” link

更新：我认为 Angular 9 将为我的问题提供解决方案。一旦我测试了它，我会发布它。

我很想知道您是否尝试过我在下面提供的配置。这对我来说是有效的。 Angular 9 在这方面有什么变化？

【参考方案1】：

要设置仅针对 ES2015 的构建，请执行以下操作：

在你的tsconfig.json:

请确保将目标设置为 es2015：

"target": "es2015"

并设置您的browserlist 配置如下：

last 2 Chrome versions
last 2 Chromeandroid versions
last 2 Safari versions
last 2 ios versions
last 2 Firefox versions
last 2 FirefoxAndroid versions
last 2 Edge versions

这些设置仅针对 ES2015 编译，但我没有看到脚本标签中包含 type 属性，正如您在生成的索引页面中所指出的那样：

<script src="runtime.HASH.js" type="module"></script>

如果我错了，请有人纠正我，但我认为 type 属性是不必要的，除非您打算为旧版浏览器嵌入额外的脚本，这是您首先要避免的，因此，它在这种情况下没有必要。看到这个link for reference

最后，请注意，您可以使用以下命令检查您的 browserlist 配置将针对哪些浏览器版本：

npx browserslist