Laravel + Angular api not working properly?

I have developed web app using Angular with backend Laravel. but in my Angular page did not display backend data. I have following data.service.ts

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

@Injectable({
  providedIn: 'root'
})
export class DataService {

  constructor(private httpClient:HttpClient) { }

  getData() {
    return this.httpClient.get('http://127.0.0.1:8000/api/employees');
  }
}

but I got flowing error message

expected onespace after colon in parameter (typedef-whitespace)
missing whitespace (whitespace)
expected call-signature: 'getData' to have a typedef (typedef)

How could I fix this?

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