Services in angular?

JavaScript
1

i have just started learning angular i came across following code in the constructor we are using private firebase: AngularFireDatabase is this automatically injected by angular or whats really happening?

import { Injectable } from '@angular/core';

import { AngularFireDatabase,AngularFireList } from 'angularfire2/database';

import { Employee } from './employee.model'; 

@Injectable()
export class EmployeeService {

   employeeList: AngularFireList<any>;

   selectedEmployee: Employee = new Employee();
     constructor(private firebase: AngularFireDatabase) { }

     getData(){

      this.employeeList = this.firebase.list('employees');
      return this.employeeList;

     }

     insertEmployee(employee : Employee){

      this.employeeList.push({

        name : employee.name,
        position : employee.postition,
        office: employee.office,
        salary :employee.salary
        
      })

     }

}
2

Yes, given it is in the module’s providers array.

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