Is there a way to pass a method along with its specific generic type to RXJS bindCallback?

When trying to pass a function with callback to the rxjs bindCallback function, I encountered an issue with my generic type.

Here is the code snippet in question:

const obCreator = bindCallback<T>(FakeServer.instance.on<T>);
return obCreator(module, method);

The error occurs in the first line:

An overload does not match this call. Overload 1 of 34, '(callbackFunc: (callback: (res1: T) => any) => any, scheduler?: SchedulerLike | undefined): () => Observable', has given the following error. Argument of type 'void' is not assignable to parameter of type '(callback: (res1: T) => any) => any'.

The below code has no error but lacks generics:

const obCreator = bindCallback(FakeServer.instance.on);
return obCreator(module, method);

Answer №1

As per the documentation, the initial format of bindCallback is

bindCallback<T>(callbackFunc: Function, resultSelector?: Function | SchedulerLike, scheduler?: SchedulerLike): (...args: any[]) => Observable<T>

This implies that you can specify a generic type for bindCallback, however, the function provided as input does not have any generics. Hence, you should be able to implement it in the following manner

const obCreator = bindCallback<T>(FakeServer.instance.on);
return obCreator(module, method);  // returns an Observable<T>

There are no other options with generics in the overloads, making this the sole choice, and most likely there is no issue. Based on this stackblitz, it should function correctly.

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