angular - 平台设置后无法启用产品模式。 Angular 5 生产构建

Question

错误:

Uncaught Error: Cannot enable prod mode after platform setup. at main.bundle.js:1 

案例:

在使用 ng build --prod 生成构建后，应用启动时发生错误。但是，使用 ng serve 或 ng build 编译的开发构建都运行良好。

我尝试了什么:

-将全局和本地 @angular/cli 升级到最新版本，即 1.6.0，遵循 this回答。

package.json:

{
  "dependencies": {
    "@angular/animations": "^5.0.0",
    "@angular/common": "^5.0.0",
    "@angular/compiler": "^5.0.0",
    "@angular/core": "^5.0.0",
    "@angular/forms": "^5.0.0",
    "@angular/http": "^5.0.0",
    "@angular/platform-browser": "^5.0.0",
    "@angular/platform-browser-dynamic": "^5.0.0",
    "@angular/router": "^5.0.0",
    "auth0-js": "^8.11.3",
    "bootstrap": "^3.3.7",
    "core-js": "^2.4.1",
    "jquery": "^3.2.1",
    "rxjs": "^5.5.2",
    "zone.js": "^0.8.14"
  },
  "devDependencies": {
    "@angular/cli": "^1.6.0",
    "@angular/compiler-cli": "^5.0.0",
    "@angular/language-service": "^5.0.0",
    "@types/jasmine": "~2.5.53",
    "@types/jasminewd2": "~2.0.2",
    "@types/jquery": "^3.2.16",
    "@types/node": "~6.0.60",
    "@types/rx": "^4.1.1",
    "codelyzer": "~3.2.0",
    "jasmine-core": "~2.6.2",
    "jasmine-spec-reporter": "~4.1.0",
    "karma": "~1.7.0",
    "karma-chrome-launcher": "~2.1.1",
    "karma-cli": "~1.0.1",
    "karma-coverage-istanbul-reporter": "^1.2.1",
    "karma-jasmine": "~1.1.0",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.1.2",
    "ts-node": "~3.2.0",
    "tslint": "~5.7.0",
    "typescript": "^2.6.2"
  }
}

ma​​in.ts

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).catch(err => console.log(err));

重现错误的最小代码:

git/cli-reproapp

Answer 1

在您提供的示例应用程序中 git/cli-reproapp由于这一行而发生错误:-

export const isInDevMode = isDevMode();

在文件 cli-reproapp/src/app/app.constants.ts 中。因此，作为一种解决方法，您可以创建一个函数而不是常量 isInDevMode ，如下所示。以便 isDevMode() 在代码中实际使用时调用(最重要的是在调用 enableProdMode() 之后)。

export function isInDevMode():boolean {
    return isDevMode();
}

显然，此后您还需要更改使用“isInDevMode”常量调用新创建的“isInDevMode()”方法的行。因此，在示例应用程序中，您需要替换 app.component.ts 中的以下行

this.title = isInDevMode ? 'App in dev mode works.' : 'App is prod mode works.'

用这个:-

this.title = isInDevMode() ? 'App in dev mode works.' : 'App is prod mode works.'

您还可以在链接 git/cli-reproapp(working) 查看示例应用程序的工作版本.