错误:t没有提供者

Question

我试图通过ng build --prod将我的角度代码编译到生产模式并且它成功但在浏览器中我得到错误:

ERROR p {__zone_symbol__error: Error: Uncaught (in promise): Error: NullInjectorError: No provider for t!

错误:NullInjectorError:...,...}

当我只运行构建时,html工作正常.

我试过git hub上提到的几个链接:

https://github.com/angular/angular/issues/19219 https://github.com/angular/angular-cli/issues/6851

没有多大帮助.

附加我的Package.json文件内容:

{
  "name": "xxx",
  "version": "0.0.0",
  "license": "MIT",
  "angular-cli": {},
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "test": "ng test",
    "pree2e": "webdriver-manager update --standalone false --gecko false",
    "e2e": "protractor",
    "build": "ng build && node server.js",
    "dev": "ng build -w & nodemon server.js --watch dist --watch server",
    "production": "ng build --prod & node server.js dist server "
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "~5.0.0",
    "@angular/common": "~5.0.0",
    "@angular/compiler": "~5.0.0",
    "@angular/compiler-cli": "~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",
    "@jaspero/ng2-alerts": "0.0.7",
    "axios": "^0.17.0",
    "body-parser": "^1.18.2",
    "cookie-parser": "^1.4.3",
    "core-js": "^2.4.1",
    "ethereumjs-tx": "^1.3.3",
    "express": "^4.16.2",
    "express-session": "^1.15.6",
    "mongoose": "^4.12.6",
    "rxjs": "^5.0.1",
    "ts-helpers": "^1.1.1",
    "web3": "^1.0.0-beta.24",
    "web3-provider-engine": "^13.3.3",
    "zone.js": "^0.7.2"
  },
  "devDependencies": {
    "@angular/cli": "^1.5.0",
    "@angular/compiler-cli": "1.5.0",
    "@types/jasmine": "2.5.38",
    "@types/node": "^6.0.42",
    "codelyzer": "~2.0.0-beta.1",
    "jasmine-core": "2.5.2",
    "jasmine-spec-reporter": "2.5.0",
    "karma": "1.2.0",
    "karma-chrome-launcher": "^2.0.0",
    "karma-cli": "^1.0.1",
    "karma-jasmine": "^1.0.2",
    "karma-remap-istanbul": "^0.2.1",
    "protractor": "~4.0.13",
    "ts-node": "1.2.1",
    "tslint": "^4.3.0",
    "typescript": "2.4.2"
  }
}

app.module.ts也是

import {BrowserModule} from '@angular/platform-browser';
import {NgModule} from '@angular/core';
import {FormsModule} from '@angular/forms';
import {HttpClientModule} from '@angular/common/http';
import {BrowserAnimationsModule} from '@angular/platform-browser/animations';
import {JasperoAlertsModule} from '@jaspero/ng2-alerts';
// Imports commented out for brevity
import {RouterModule} from '@angular/router';
// Components
import {AppComponent} from './app.component';
import {LoginComponent} from './component/login/login.component';
import {DashboardComponent} from './component/dashboard/dashboard.component';
// Services
import {RecordsService} from './services/records.service';
import {AccountService} from './services/account.service';
import {AuthenticateService} from './services/authenticate.service';
import {FooterComponent} from './component/footer/footer.component';
import {HeaderComponent} from './component/header/header.component';


// Define the routes
const ROUTES = [
  {
    path: '',
    redirectTo: 'login',
    pathMatch: 'full'
  },
  {
    path: 'login',
    component: LoginComponent
  },
  {
    path: 'dashboard',
    component: DashboardComponent
  }
];

@NgModule({
  declarations: [
    AppComponent,
    HeaderComponent,
    FooterComponent,
    LoginComponent,
    DashboardComponent
  ],
  imports: [
    BrowserModule,
    HttpClientModule,
    BrowserAnimationsModule,
    FormsModule,
    JasperoAlertsModule,
    RouterModule.forRoot(ROUTES) // Add routes to the app
  ],
  providers: [
    RecordsService,
    AccountService,
    AuthenticateService
  ],
  bootstrap: [AppComponent]
})
export class AppModule {
}

Answer 1

运行以下命令，首先查找缺少哪个服务依赖。在本地修复它，Prod build 将自动工作。

ng serve --prod --optimization=false

Answer 2

您正在尝试使用providersAppModule中未列出的服务.将服务添加到提供者列表以使其工作.

Answer 3

通过编辑文件来禁用terser插件：

node_modules/@angular-devkit/build-angular/src/angular-cli-files/models/webpack-configs/common.js

并注释掉：

extraMinimizers.push(new TerserPlugin({
  sourceMap: scriptsSourceMap,
  parallel: true,
  cache: true,
  terserOptions,
}));

重建应用程序，ng build frontend --prod您应该能够在控制台中看到无法注入哪些服务。