无法在NgModule中声明模块，因为它不是当前编译的一部分。Angular

Question

我不确定这里发生了什么，但是在将'FormsModule'和'reactiveformsmodule'导入到我的'app.module'组件时，我收到了一个错误消息“Cannot declare 'FormsModule' in an NgModule as it's not a part of the current compilation”。 我正在运行Angular 9，并尝试清除缓存、重新安装npm。这可能是Angular 9的问题吗？降级到8会解决问题吗......

我对这里发生的事情感到困惑，因为前一天导入时它很好地工作了。

app.module.ts

    import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';
import { HttpClientModule } from '@angular/common/http';
import { ExpertAdviceLandingPageComponent } from './expert-advice-landing-page/expert-advice-landing-page.component';
import { InstagramComponent } from './instagram/instagram.component';
import { MDBBootstrapModule } from 'angular-bootstrap-md';
import { SharedModule } from './shared/shared.module';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { BuyingGuideComponent } from './buying-guide/buying-guide.component';
import { IdeasAndInspirationComponent } from './ideas-and-inspiration/ideas-and-inspiration.component';
import { AdviceAndGuidanceComponent } from './advice-and-guidance/advice-and-guidance.component';
import { GuidesComponent } from './guides/guides.component';
import { CommonModule } from '@angular/common';
import { CarouselComponent } from './carousel/carousel.component';
import { CarouselModule } from 'angular-bootstrap-md';
import { AppRoutingModule } from './app-routing.module';
import { SharedService } from './shared/sharedService';
import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';

@NgModule({
  declarations: [
    AppComponent,
    BuyingGuideComponent,
    IdeasAndInspirationComponent,
    AdviceAndGuidanceComponent,
    GuidesComponent,
    ExpertAdviceLandingPageComponent,
    InstagramComponent,
    CarouselComponent,
    FormsModule,
    ReactiveFormsModule
  ],
  imports: [
    BrowserModule,
    SharedModule,
    HttpClientModule,
    CommonModule,
    CarouselModule,
    MDBBootstrapModule.forRoot(),
    BrowserAnimationsModule,
    AppRoutingModule,
    NgbModule,
    FormsModule,
    ReactiveFormsModule

  ],
  providers: [SharedService],
  bootstrap: [AppComponent]
})
export class AppModule {
}

- ashley g

---

考虑从declarations数组中移除FormsModule和ReactiveFormsModule。 - Ashish Ranjan

哦，天啊，我甚至没有注意到那个！谢谢你。 - ashley g

Answer 1

在Angular中导入模块应该放在imports数组下，而不是declarations。

declarations: [
    AppComponent,
    // ReactiveFormsModule---remove from declarations and add in import because its is imported
    // FormsModule`enter code here`---remove from declarations and add in import
],
imports: [
    ReactiveFormsModule,
    FormsModule
]

- Rashmi HazeL ivy DorisFay

Answer 2

在Angular中导入模块时，应将其放置在imports数组下而不是declarations下。

@NgModule({
declarations: [
     AppComponent
],
imports: [
     BrowserModule,
     AppRoutingModule, 
     MatSliderModule    // whatever module you want to use
],
providers: [],
bootstrap: [AppComponent]
});

- Jyotirmoy Upadhaya

Answer 3

如果你在库中工作并从错误的源导入模块，也可能会发生错误。

import { myLibraryModule } from '@my/library'

应该是这样的

import { myLibraryModule } from './library.module'

- Raphaël Balet