Angular 5 encountering issue with @Injectable annotation causing TypeScript error

While trying to compile my code, I encountered the following error:

import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';

@Injectable()
export class TaskService {
  constructor(private http: HttpClient) {
  }
  
  getTasks() {
    return this.http.get('/api/tasks');
  }
}

An error occurred in src/app/tasks/task.service.ts(4,1): error TS1238: Unable to resolve signature of class decorator when called as an expression.

I'm unsure about what went wrong... it seems like there's an issue with the @ symbol before Injectable at 4,1.

Answer №1

Consider adding a return type of

getTaskList(): Observable<any>
. Have you properly imported the HttpClientModule ?

import { HttpClientModule } from '@angular/common/http';

@NgModule({
  imports: [
    BrowserModule,
    // Make sure to include it under 'imports' in your application module
    // after importing BrowserModule.
    HttpClientModule,
  ],
})

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