打字稿中静态方法的泛型

Question

export class Module {
  static register<T>(provider: Array<Provider>): ModuleWithProviders {
     return {
        ngModule: T, // error type is being used as value
        providers: provider
     };
}

I would like to have something like this Module.register<AboutModule>([AboutService]) which tells the module and providers to be registered with that module but I am not sure how to do this using typescript generics Could any one help me with this.

Also what should be the param type to accept only types instead of other types. Say I would like to have parameter that accepts only class types.

stats(list: ClassType){} // something like this
stats(list: any){} // currently im using this, how should I restrict param only to types.

Any help is greatly appreciated.

Answer 1

You can use a custom Class type:

export type Abstract<T = any> = Function & { prototype: T };

export type Instantiable<T = any> = new (...args: any[]) => T;

export type Class<T = any> = Abstract<T> | Instantiable<T>;

Source: https://github.com/kaiu-lab/serializer/blob/master/src/class.ts

And ask for an array of classes as parameters.

Types can't be used inside the method itself, this can't be done in typescript at all, because you can't get the class of a type at runtime.

Feel free to explore the code in the github I linked, we has this exact issue and solved it using this custom class type.