Ensure the safety of TypeScript class decorators by specifying the constructor function type

Consider the following decorator:

export function MyDecorator(constructor: new(someService: SomeService, ...args) => ISomeInterface) {

when incorporating it within an Angular component, I require the compiler to verify that the service injection is not omitted in the client code:

interface ISomeInterface {
  someService: SomeService;
}

@MyDecorator
@Component(...)
export class MyComponent implements ISomeInterface {
  constructor(
    public someService: SomeService,
    private router: Router,
    private anotherService: AnotherService
    ...

While this approach functions correctly, it necessitates SomeService to be listed as the first dependency. This can be inconvenient if there is another decorator with a similar requirement. Are there any suggestions on how to enforce this constraint without considering the "position"?

Answer №1

Discovering that it is quite simple:

define function MyDecor(constructor: new(...params: any & IAnotherInterface) => ISomeOtherInterface) {

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