Angular 4 Error: No provider for HttpClient
AngularAngular HttpclientAngular Problem Overview
I am starting a new angular project with the CLI and am running into a no provider for HttpClient
error.
I have added HttpClientModule
to my module imports which seems to be the usual culprit in this scenario. Not finding a lot online other than that so I am not sure what the issue may be.
my app.module.ts
@NgModule({
declarations: [
AppComponent
],
imports: [
BrowserModule,
HttpClientModule
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }
and my service
@Injectable()
export class FlexSearchService {
constructor(private http: HttpClient) {}
getSavedSearchResult(index: string, queryName: string, query: string ): Observable<any> {
const url = `${environment.flexUrl}/${index}/search`;
const item = new SearchQuery({queryName: queryName, variables: {q: query}});
return this.http.post(url, item);
}
}
and ng version gives the following output
@angular/cli: 1.4.2
node: 6.9.4
os: darwin x64
@angular/animations: 4.4.4
@angular/common: 4.4.4
@angular/compiler: 4.4.4
@angular/core: 4.4.4
@angular/forms: 4.4.4
@angular/http: 4.4.4
@angular/platform-browser: 4.4.4
@angular/platform-browser-dynamic: 4.4.4
@angular/router: 4.4.4
@angular/cli: 1.4.2
@angular/compiler-cli: 4.4.4
@angular/language-service: 4.4.4
typescript: 2.3.4
my tsconfig
{
"compileOnSave": false,
"compilerOptions": {
"outDir": "./dist/out-tsc",
"sourceMap": true,
"declaration": false,
"moduleResolution": "node",
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"target": "es5",
"typeRoots": [
"node_modules/@types"
],
"lib": [
"es2017",
"dom"
]
}
}
My test
import { TestBed, inject } from '@angular/core/testing';
import { HttpClientModule } from '@angular/common/http';
import { FlexSearchService } from './flex-search.service';
describe('FlexSearchService', () => {
beforeEach(() => {
TestBed.configureTestingModule({
providers: [FlexSearchService, HttpClientModule]
});
});
it('should be created', inject([FlexSearchService], (service: FlexSearchService) => {
expect(service).toBeTruthy();
}));
Any help is GREATLY appreciated!
Angular Solutions
Solution 1 - Angular
In your test
TestBed.configureTestingModule({
providers: [FlexSearchService, HttpClientModule]
});
It should be
TestBed.configureTestingModule({
imports: [HttpClientModule],
providers: [FlexSearchService]
});
or even better (if you want to mock request):
TestBed.configureTestingModule({
imports: [HttpClientTestingModule],
providers: [FlexSearchService]
});
Solution 2 - Angular
Import HttpClientTestingModule.
In your test:
import { HttpClientTestingModule } from '@angular/common/http/testing';
and in the configureTestingModule of your test, do the following:
TestBed.configureTestingModule({
imports: [ HttpClientTestingModule ],
})
.compileComponents();
Solution 3 - Angular
An easier way is to provide it globally....Import the following into app.module.ts like so:
import { HttpModule } from '@angular/http'
import { HttpClient, HttpClientModule } from '@angular/common/http';
and declare it in imports:
imports: [
HttpModule,
HttpClientModule, ...
]
Solution 4 - Angular
For this you have to import the following:
import { HttpClientTestingModule } from '@angular/common/http/testing';
And for the spec file in the configureTestingModule
of your test, do the following:
TestBed.configureTestingModule({
imports: [ HttpClientTestingModule ],
})
.compileComponents();
Solution 5 - Angular
I've noticed this issue when I was trying to link my angular library locally within my project using the npm link.
Downloading the library from the repository solved my issue.