A dependency injection library that verifies all dependencies are met at compile time.

class NameKey extends TypeKey<string>() { private _: any }
class IdKey extends TypeKey<number>() { private _: any }

class User {
  name: string
  id: number
  constructor(name: string, id: number) {
    this.name = name; this.id = id
  }

  static inject = Inject.construct(this, NameKey, IdKey)
}

class App {
  user: User
  constructor(user: User) {
    this.user = user
  }
}

const UserModule = Module(ct => ct
  .provideInstance(NameKey, 'Alice')
  .provideInstance(IdKey, 123)
)

const AppModule = Module(UserModule, ct => ct
  .provide(App, { user: User }, ({ user }) => new App(user))
)

AppModule.inject({ app: App }, ({ app }) => {
  console.log(`Welcome, ${app.user.name}`)
})
Copy

Dependencies are injected to/from a Container, and can be combined into Modules.