Typescript - Interface injecting

Hi,

is it possible to inject a component based on its interface?

Let’s assume the following component:

class UserRepository implements IUserRepository

This component is injected into the controller by interface from which is implemented:

export class UserController {
    constructor(private userService: IUserRepository) {}

It would be great to be able to set dependencies as follows:

@Module({
    controllers: [ UsersController ],
    components: [
        { provide: IUserRepository, useClass: UserRepository }
    ],
})

Thanks

[JulianBiermann]

Using Interfaces as value types is not possible as they only exist during development. After transpiling interfaces no longer exist resulting in empty object values. There is a solution for your problem though using string keys as provide values and the inject decorator:

@Module({
    controllers: [ UsersController ],
    components: [
        { provide: 'IUserRepository', useClass: UserRepository }
    ],
})

export class UserController {
    constructor(@Inject('IUserRepository') private userService: IUserRepository) {}

Also see here

[lock[bot]]

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