typescriptDI
tydi is a simple Dependency Injection helper, that adds 2 simple decorators for easy property/constructor parameters injection of decorated classes or any other kind of values using assigned custom keys.
Example
First you'll need to define some service.
import { Service } from '@smertos/tydi';
@Service()
class AuthService {
isLoggedIn(): boolean {
return ...;
}
}Then somewhere you need this service, you'll need to inject the service.
import { Container, Inject } from '@smertos/tydi';
import { AuthService } from '...';
class LoginComponent {
@Inject() authService: AuthService;
logIn(): void {
if (this.authService.isLoggedIn) return;
...
}
}If you do not manage instantiation of class (i.e. React components) and do not pass any arguments, then you can use constructor parameter injection (works like in Angular 2+). Access modificators can be used with injected parameters without any problems.
class LoginComponent {
constructor(private authService: AuthService) {}
logIn(): void {
if (this.authService.isLoggedIn) return;
...
}
}If you wish to do instantiation yourself as well, as pass parameters to constructor, you can do it as it is supported, but TypeScript may think about it otherwise.