A service without dependencies is a service whose constructor is empty:
export Service { constructor(){} getData() {}}
To use it, you simply type:
import { Service } from './service'let service = new Service();service.getData();
Any module that consumes this service will get their own copy of the code, with this kind of code. If you, however, want consumers to share a common instance, you change the service module definition slightly to this:
class Service { constructor() {} getData() {}}const service = new Service();export default service;
Here, we export an instance of the service rather than the service declaration.
