具有提供程序作为包依赖项的模块node_modules

Question

我有一个模块，在包依赖项中带有提供程序。但是当我尝试在我的app.module中使用它时，我得到：

Error: No provider for EnvService!

/node_modules/common-components/env.module：

import { NgModule, ModuleWithProviders } from '@angular/core';
import { CommonModule } from '@angular/common';
import { WindowService } from './window.service';
import { EnvService } from './env.service';
export function windowFactory() {
return window;
}
@NgModule({
imports: [
CommonModule
]
})
export class EnvModule {
static forRoot(): ModuleWithProviders {
return {
ngModule: EnvModule,
providers: [
EnvService,
{ provide: WindowService, useFactory: windowFactory }
]
}
}
}

app.module.ts

import { EnvModule } from 'common-components';
@NgModule({
declarations: [
AppComponent
],
imports: [
BrowserModule,
FormsModule,
ReactiveFormsModule,
HttpModule,
EnvModule.forRoot()
],
bootstrap: [ AppComponent ]
})
export class AppModule { }

Answer 1

在模块的提供程序中也包含EnvService：

import { NgModule, ModuleWithProviders } from '@angular/core';
import { CommonModule } from '@angular/common';
import { WindowService } from './window.service';
import { EnvService } from './env.service';
export function windowFactory() {
return window;
}
@NgModule({
imports: [
CommonModule
],
providers: [
EnvService
]
})
export class EnvModule {
static forRoot(): ModuleWithProviders {
return {
ngModule: EnvModule,
providers: [
EnvService,
{ provide: WindowService, useFactory: windowFactory }
]
}
}
}