Angular - How to fix 'property does not exist on type' error?

Question

I am following this video tutorial (text version of the same). I have followed exactly the same code and I am receiving this error:

error TS2339: Property 'getEmployees' does not exist on type 'EmployeeService'

I looked on the Internet and visited many questions on Stack Overflow like this, this, this and this, and so many others issues opened related to this error on GitHub.

Service:

//import statements go here ...  @Injectable() export class EmployeeService { private listEmployees: Employee[] = [     {       //just to avoid longer code, deleted dummy data.     },   ];    getEmployees(): Employee[] {       return this.listEmployees; //ERROR in src/app/employees/list-employees.component.ts(14,44)   } } 

Component class:

//import statements @Component({     selector: 'app-list-employees',     templateUrl: './list-employees.component.html',     styleUrls: ['./list-employees.component.css'] }) export class ListEmployeesComponent implements OnInit {     employees: Employee[];     constructor(private _EmployeeService: EmployeeService) { }      ngOnInit() {         this.employees = this._EmployeeService.getEmployees();     }  } 

I have imported service in app.module.ts and added it in providers array of ngModule.

I am not able to solve the error neither to understand what is causing this error.

Answer 1

It usually happens when you develop Angular applications. To solve this just shut down the server & start it again:

$ ng serve  

Explanation

This happens because when you start the application, The server is actually serving the bundles(JavaScript/CSS/HTML... output files) stored in the dist folder. Sometimes, when you make changes in your code, the changes don't reflect in your bundles, which will lead to the server still using the old bundles.

Answer 2

If you want to avoid the compilation warning then the dirty fix would be to make

employees: any[]; 

any instances allow any method to call any method on that object. This will avoid compilation warning but it's not runtime safe.

You need to be careful before using it. If you are sure that the method will be available at runtime then only use it.