升级到 Angular 8 后，ng build生成一个支持差异加载的正确 index.html，但ng serve生成一个不同的 index.html，其中仅包含对某些生成的“es5”脚本的引用。因此，该应用程序无法在 IE 11 等 ES5 浏览器中运行。
到目前为止，我有：
- 确认该应用程序在现代 ES2015+ 浏览器（如 Chrome）中按预期运行
- 确认该应用在 Angular 8 升级之前在 IE 11 上运行
- 比较 IE 11 中的 index.html 源代码与 dist 目录中生成的源代码 from
ng build，可以看到脚本引用的差异（参见下面的示例代码） - 在 Github 和 stackoverflow 上搜索 angular 和 angular-cli 问题以查找类似问题
- 尝试使用和不使用 angular.json 中即将弃用的 es5BrowserSupport 选项构建和服务
- 更新到最新版本的 @angular-devkit 和 @angular 包
我正在处理的存储库包含一个应用程序项目和一个库项目。以下是 Angular 8 升级后来自 angular.json 的相关架构目标：
"architect": {
"build": {
"builder": "@angular-devkit/build-angular:browser",
"options": {
"outputPath": "dist/ng-shared-components-tester",
"index": "projects/ng-shared-components-tester/src/index.html",
"main": "projects/ng-shared-components-tester/src/main.ts",
"polyfills": "projects/ng-shared-components-tester/src/polyfills.ts",
"tsConfig": "projects/ng-shared-components-tester/tsconfig.app.json",
"assets": [
"projects/ng-shared-components-tester/src/favicon.ico",
"projects/ng-shared-components-tester/src/assets"
],
"styles": [
"node_modules/bootstrap/dist/css/bootstrap.min.css",
"projects/ng-shared-components-tester/src/styles.css",
"node_modules/abc-emerald-standards/dist/emerald/assets/css/default.css",
"node_modules/abc-emerald-standards/dist/emerald/assets/css/forms.css"
],
"scripts": [],
"es5BrowserSupport": true
},
"configurations": {
"production": {
"fileReplacements": [
{
"replace": "projects/ng-shared-components-tester/src/environments/environment.ts",
"with": "projects/ng-shared-components-tester/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"
}
]
}
}
},
"serve": {
"builder": "@angular-devkit/build-angular:dev-server",
"options": {
"browserTarget": "ng-shared-components-tester:build"
},
"configurations": {
"production": {
"browserTarget": "ng-shared-components-tester:build:production"
}
}
},
这是启用了 IE 11 支持的 browserlist 文件：
> 0.5%
last 4 versions
IE 11
not dead
tsconfig.json：
{
"compileOnSave": false,
"compilerOptions": {
"importHelpers": true,
"outDir": "./dist/out-tsc",
"baseUrl": "./",
"sourceMap": true,
"declaration": false,
"moduleResolution": "node",
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"target": "es2015",
"typeRoots": [
"node_modules/@types"
],
"lib": [
"es2018",
"dom"
],
"module": "esnext",
"paths": {
"@abc/ng-shared-components": [
"dist/abc/ng-shared-components"
],
"@abc/ng-shared-components/*": [
"dist/abc/ng-shared-components/*"
]
}
},
"angularCompilerOptions": {
"annotateForClosureCompiler": true,
"skipTemplateCodegen": true,
"strictMetadataEmit": true,
"fullTemplateTypeCheck": true,
"strictInjectionParameters": true
},
}
预期结果
ng build在 dist/ng-shared-components-tester/index.html 中生成预期结果：
<body>
<app-root></app-root>
<script src="runtime-es2015.js" type="module"></script>
<script src="polyfills-es2015.js" type="module"></script>
<script src="runtime-es5.js" nomodule></script>
<script src="polyfills-es5.js" nomodule></script>
<script src="styles-es2015.js" type="module"></script>
<script src="styles-es5.js" nomodule></script>
<script src="vendor-es2015.js" type="module"></script>
<script src="main-es2015.js" type="module"></script>
<script src="vendor-es5.js" nomodule></script>
<script src="main-es5.js" nomodule></script>
</body>
实际结果
ng serve正在为仅包含 ES5 版本的 pollfills.js 的 IE 11 提供 index.html：
<body>
<app-root></app-root>
<script src="runtime.js"></script>
<script src="polyfills-es5.js" nomodule></script>
<script src="polyfills.js"></script><script src="styles.js"></script>
<script src="vendor.js"></script>
<script src="main.js"></script>
</body>
