What is the comparable alternative to promise<void> in observables?

I've been working with Angular using TypeScript and I'm attempting to return a promise from an observable. What is the correct way to accomplish this?

So far, I have tried the following:

of(EMPTY).toPromise() // error: Promise<Observable<never>>' is not assignable to type Promise<void>

of(null).toPromise() // no error but not sure if it's the right approach

of().toPromise // error: Promise<Observable<unknown>>' is not assignable to type Promise<void> 

Update:

// This is the interface that defines it

export interface CustomStoreOptions extends StoreOptions<CustomStore> {   
   /** Specifies a custom implementation of the remove(key) method. */
    remove?: ((key: any | string | number) => Promise<void> | JQueryPromise<void>);   
}

It is invoked like this:

let store = new CustomStore({     
        remove: key => {
          // return ...
        }
      });

Answer №1

If you want to achieve the same result as Promise<void>, you can write it like this:

 of(void(0))

Another option is to generate a Subject that doesn't emit any data

 const s = new Subject<void>();
 s.next(void(0));

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