Angular 4.4.0-4.4.2生产构建出现“NgForm无提供者！”错误。

Question

在生产模式下运行我的Angular应用程序时，我遇到了一个错误。

"没有提供者e!"

在开发模式下，它可以正常工作。出现了以下错误：

我尝试使用ng build -aot，现在出现错误：

"错误：NgForm没有提供者！"

有人知道如何修复它吗？

以下是我使用的package.json文件：

{
  "name": "app-web",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "hmr": "ng serve --hmr -e=hmr",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^4.2.4",
    "@angular/common": "^4.2.4",
    "@angular/compiler": "^4.2.4",
    "@angular/core": "^4.2.4",
    "@angular/forms": "^4.2.4",
    "@angular/http": "^4.2.4",
    "@angular/platform-browser": "^4.2.4",
    "@angular/platform-browser-dynamic": "^4.2.4",
    "@angular/router": "^4.2.4",
    "@types/bootstrap-datepicker": "0.0.10",
    "@types/d3": "^4.10.0",
    "@types/jquery": "^3.2.11",
    "bootstrap": "^3.3.7",
    "bootstrap-datepicker": "^1.7.1",
    "core-js": "^2.4.1",
    "d3": "^4.10.2",
    "file-saver": "^1.3.3",
    "jquery": "^3.2.1",
    "moment": "^2.18.1",
    "ng-bootstrap-form-validation": "^1.0.3",
    "ng2-ckeditor": "^1.1.9",
    "ngx-bootstrap": "^1.8.1",
    "ngx-malihu-scrollbar": "^1.2.1",
    "rxjs": "^5.4.2",
    "zone.js": "^0.8.14"
  },
  "devDependencies": {
    "@angular/cli": "1.3.0",
    "@angular/compiler-cli": "^4.2.4",
    "@angular/language-service": "^4.2.4",
    "@angularclass/hmr": "^2.1.3",
    "@types/jasmine": "~2.5.53",
    "@types/jasminewd2": "~2.0.2",
    "@types/node": "~6.0.60",
    "codelyzer": "~3.1.1",
    "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": "~5.3.2",
    "typescript": "~2.3.3"
  }
}

- Rajesh Kumar

---

你正在使用angular-cli吗？你使用的是哪个版本的Angular？ - cyr_x

我认为，当您不压缩代码时，您将获得完整的错误消息。 - Jeffrey Roosendaal

我需要为未压缩的代码做哪些设置？ - Rajesh Kumar

尝试使用AoT构建dev版本。 - user663031

你正在使用响应式表单吗？ - yurzui

Answer 1

更新:

Angular v4.4.3 应该会修复这个问题。

之前的版本:

我猜你正在使用 Angular 4.x 版本。

这是一个已知的问题。等待 新版本的 Angular 发布 或将 Angular 版本设置为 4.3.6。

另请参阅

• https://github.com/angular/angular/issues/19219

- yurzui

Answer 2

我是这样解决的：

import { FormsModule, NgForm } from '@angular/forms';
import { myComponent } from './my.component';
describe('myComponent', () => {
let component: myComponent;
let fixture: ComponentFixture<EmailInputsComponent>;
beforeEach(async(() => {
    TestBed.configureTestingModule({
        imports: [FormsModule],
        declarations: [myComponent],
        providers: [NgForm] // <- LOOK AT ME I AM A PROVIDER!!!

- mruanova