从 Angular 8 迁移后的 Angular 9 编译错误

Question

我将我的 Angular 应用程序从版本 8 迁移到了 9。运行 ng serve --open 后，我的应用程序在浏览器中打开并卡在加载屏幕上，并在控制台窗口中显示此错误:

core.js:610 Uncaught Error: Angular JIT compilation failed: '@angular/compiler' not loaded!
  - JIT compilation is discouraged for production use-cases! Consider AOT mode instead.
  - Did you bootstrap using '@angular/platform-browser-dynamic' or '@angular/platform-server'?
  - Alternatively provide the compiler with 'import "@angular/compiler";' before bootstrapping.
    at getCompilerFacade (core.js:610)
    at Function.get (core.js:38351)
    at getNgModuleDef (core.js:2195)
    at assertNgModuleType (core.js:2933)
    at compileNgModuleFactory__POST_R3__ (core.js:41373)
    at PlatformRef.bootstrapModule (core.js:41740)
    at Module../src/main.ts (main.ts:11)
    at __webpack_require__ (bootstrap:79)
    at Object.0 (main.ts:13)
    at __webpack_require__ (bootstrap:79)

Answer 1

checkin app.module.ts 如果您缺少模块...例如，有时在模块文件中人们会导入 HttpClient 而不是 HttpClient模块或者可能是因为有棱 Angular 的 Material ，例如人们使用 MatButton 而不是 MatButtonModule 有时会导致这个问题。