关于 Angular 9 迁移的 Angular 生产问题
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【中文标题】关于 Angular 9 迁移的 Angular 生产问题【英文标题】：issue on angular production build on angular 9 migrate 【发布时间】：2020-06-24 11:03:35 【问题描述】：大家好，我在迁移后遇到了 Angular 问题，我有 将项目从 angular 8 迁移到 angular 9 。与 ng 的角度 server --prod 在版本 8 中有效，但在版本 9 中出现错误。 我已经检查了 ng build --prod 和 ng serve --prod。作为新 angular 9 有用于 AOT 编译的 IVY 编译器，所以我已经导入 main.ts 中的角度/编译器，引导程序也在注入 平台浏览器动态 正如我所看到的，Angular 8/9 在开发模式下使用 jit 编译为 ng serve，所以项目在 jit 上运行，但由于 angular 使用 aot 编译进行生产，我的代码库出现错误
polyfills.ts ` 导入'@angular/编译器'； 导入'@angular/localize/init'； 导入'core-js/es/array'； 导入'zone.js/dist/zone';
`
**main.ts**
`
import '@angular/compiler';
import enableProdMode from '@angular/core';
import platformBrowserDynamic from '@angular/platform-browser-dynamic';
import AppModule from './app/app.module';
import environment from './environments/environment';
if (environment.production)
enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);
`
**package.json**
`
"name": "project",
"version": "0.0.0",
"scripts":
"ng": "ng",
"start": "ng serve",
"build": "ng build",
"test": "ng test",
"lint": "ng lint",
"e2e": "ng e2e"
,
"private": true,
"dependencies":
"@angular/animations": "^9.0.5",
"@angular/cdk": "^9.0.0",
"@angular/common": "^9.0.5",
"@angular/compiler": "^9.0.5",
"@angular/core": "^9.0.5",
"@angular/forms": "^9.0.5",
"@angular/http": "^7.2.16",
"@angular/localize": "^9.0.5",
"@angular/material": "^7.3.2",
"@angular/platform-browser": "^9.0.5",
"@angular/platform-browser-dynamic": "^9.0.5",
"@angular/router": "^9.0.5",
"@ng-bootstrap/ng-bootstrap": "^6.0.0",
"@ngx-translate/core": "^12.1.2",
"@ngx-translate/http-loader": "^4.0.0",
"@sentry/browser": "^5.13.2",
"angular-file-uploader": "^5.0.2",
"angular-ng-autocomplete": "^2.0.1",
"angular2-signaturepad": "^2.11.0",
"core-js": "^3.6.4",
"jquery": "^3.4.1",
"moment": "^2.24.0",
"ng2-haversine": "^0.1.1",
"ng2-uploader": "^2.0.0",
"ngx-spinner": "^8.1.0",
"ngx-ui-loader": "^8.0.0",
"rxjs": "^6.5.4",
"zone.js": "~0.10.2"
,
"devDependencies":
"@angular-devkit/build-angular": "~0.900.5",
"@angular/cli": "~9.0.5",
"@angular/compiler-cli": "^9.0.5",
"@angular/language-service": "^9.0.5",
"@types/jasmine": "~3.5.7",
"@types/jasminewd2": "~2.0.8",
"@types/jquery": "^3.3.33",
"@types/node": "~13.7.7",
"codelyzer": "~5.2.1",
"jasmine-core": "~3.5.0",
"jasmine-spec-reporter": "~4.2.1",
"karma": "^4.4.1",
"karma-chrome-launcher": "~3.1.0",
"karma-coverage-istanbul-reporter": "~2.1.1",
"karma-jasmine": "~3.1.1",
"karma-jasmine-html-reporter": "^1.5.2",
"protractor": "^5.4.3",
"ts-node": "~8.6.2",
"tslint": "~6.0.0",
"typescript": "^3.6.4"
`
**angular.json**
`
"$schema": "./node_modules/@angular/cli/lib/config/schema.json",
"version": 1,
"newProjectRoot": "projects",
"projects":
"project":
"root": "",
"sourceRoot": "src",
"projectType": "application",
"prefix": "app",
"schematics": ,
"architect":
"build":
"builder": "@angular-devkit/build-angular:browser",
"options":
"outputPath": "dist/project",
"index": "src/index.html",
"main": "src/main.ts",
"polyfills": "src/polyfills.ts",
"tsConfig": "src/tsconfig.app.json",
"assets": [
"src/favicon.ico",
"src/assets"
],
"styles": [
"src/styles.css"
],
"scripts": []
,
"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
,
"serve":
"builder": "@angular-devkit/build-angular:dev-server",
"options":
"browserTarget": "project:build"
,
"configurations":
"production":
"browserTarget": "project:build:production"
,
"extract-i18n":
"builder": "@angular-devkit/build-angular:extract-i18n",
"options":
"browserTarget": "project:build"
,
"test":
"builder": "@angular-devkit/build-angular:karma",
"options":
"main": "src/test.ts",
"polyfills": "src/polyfills.ts",
"tsConfig": "src/tsconfig.spec.json",
"karmaConfig": "src/karma.conf.js",
"styles": [
"src/styles.css"
],
"scripts": [],
"assets": [
"src/favicon.ico",
"src/assets"
]
,
"lint":
"builder": "@angular-devkit/build-angular:tslint",
"options":
"tsConfig": [
"src/tsconfig.app.json",
"src/tsconfig.spec.json"
],
"exclude": [
"**/node_modules/**"
]
,
"project-e2e":
"root": "e2e/",
"projectType": "application",
"architect":
"e2e":
"builder": "@angular-devkit/build-angular:protractor",
"options":
"protractorConfig": "e2e/protractor.conf.js",
"devServerTarget": "project:serve"
,
"configurations":
"production":
"devServerTarget": "project:serve:production"
,
"lint":
"builder": "@angular-devkit/build-angular:tslint",
"options":
"tsConfig": "e2e/tsconfig.e2e.json",
"exclude": [
"**/node_modules/**"
]
,
"defaultProject": "project",
"cli":
"analytics": "87b84483-668a-45d2-a5fa-0b6badd7e97e"
`
tsconfig.json `
"compileOnSave": false,
"compilerOptions":
"baseUrl": "./",
"outDir": "./dist/out-tsc",
"sourceMap": true,
"declaration": false,
"module": "es2015",
"moduleResolution": "node",
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"target": "es5",
"typeRoots": [
"node_modules/@types"
],
"lib": [
"es2017",
"dom"
]
,
"angularCompilerOptions":
"enableIvy": true
`
我在 ng serve --prod 或 ng serve --prod --aot=true 的 chrome 控制台上遇到以下问题。 `
polyfills.9b85908313a7766a001a.js:1.
Unhandled Promise rejection: 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. ; Zone: <root> ; Task: Promise.then ; Value: 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 Q (main.a41bfed0d971f96f8f03.js:1)
at Function.get (main.a41bfed0d971f96f8f03.js:1)
at $e (main.a41bfed0d971f96f8f03.js:1)
at Qa (main.a41bfed0d971f96f8f03.js:1)
at main.a41bfed0d971f96f8f03.js:1
at e.processProvider (main.a41bfed0d971f96f8f03.js:1)
at main.a41bfed0d971f96f8f03.js:1
at main.a41bfed0d971f96f8f03.js:1
at Array.forEach (<anonymous>)
at Se (main.a41bfed0d971f96f8f03.js:1) 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 Q (http://localhost:4200/main.a41bfed0d971f96f8f03.js:1:138535)
at Function.get (http://localhost:4200/main.a41bfed0d971f96f8f03.js:1:198740)
at $e (http://localhost:4200/main.a41bfed0d971f96f8f03.js:1:144912)
at Qa (http://localhost:4200/main.a41bfed0d971f96f8f03.js:1:204231)
at http://localhost:4200/main.a41bfed0d971f96f8f03.js:1:202451
at e.processProvider (http://localhost:4200/main.a41bfed0d971f96f8f03.js:1:202465)
at http://localhost:4200/main.a41bfed0d971f96f8f03.js:1:202249
at http://localhost:4200/main.a41bfed0d971f96f8f03.js:1:141452
at Array.forEach (<anonymous>)
at Se (http://localhost:4200/main.a41bfed0d971f96f8f03.js:1:141399)
`
当我使用 ng serve 它在我的本地主机上服务时没有问题，但是当我 添加 prod 关键字或尝试使用 ng build --prod 进行构建。 dist 文件夹在我的开发服务器上不起作用，我得到了 以上错误。
【问题讨论】：
你发现了吗？我也有同样的问题 【参考方案1】：在main.ts文件中导入编译器
导入'@angular/compiler'；
【讨论】：
【参考方案2】：Angular AOT 选项从版本 9 开始默认设置为 true。 执行以下操作来解决问题
-
在 main.ts 文件中导入“@angular/compiler”
升级所有依赖项
在 angular.json 中将“aot”选项设置为 false
如果使用“buildOptimizer”标志，那么也将其设置为 false，因为“buildOptimizer”仅适用于“aot”设置为 true
【讨论】：
【参考方案3】：无需更改任何内容，只需将其设为假
"angularCompilerOptions":
"enableIvy": false
【讨论】：
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