Take a look at the response type of item.payload.doc.data() in the screenshot provided.
The response type is unknown. Even if the object being received can be spread, TypeScript will display this error during compilation. You can attempt something similar to the code snippet below:
return {
id : item.payload.doc.id,
...(item.payload.doc.data() as Record<string,any>)
} as Employee
I cannot guarantee whether this will fulfill the requirements of the Employee interface. Alternatively, you could try replacing Record<string,any> with Employee.
Note
The code excerpt here does not show your employee service. Upon reviewing the screenshot again, it appears that Firebase allows you to specify the type when integrating with Firebase.
The
QueryDocumentSnapshot<unkown>.data
suggests that you have not specified the expected type from the Firebase integration. When using the Firebase SDK/module (in whichever way), there should be an option to define the interface you are anticipating as a generic.
If you do so, you should avoid the current issue you are facing.
It has been quite some time since I last worked with Firebase, so I want to emphasize this implementation is hypothetical, and you should refer to their documentation on where and how to declare the generic type. However, the following is a common practice.
import {Firebase} from 'firebase';
import {Employee} from './employee.interface.ts';
export class EmployeeService {
getEmployees() {
return Firebase.getRecords<Employee>('some/path/or/resource');
}
}