adding typed events to an extended class that extends EventEmitter? about tiny-typed-emitter HOT 3 CLOSED

It's more of a Typescript related question.

You'll need to make Stream generic as well where it accepts MyEvents as type parameter:

import { TypedEmitter, ListenerSignature, DefaultListener } from 'tiny-typed-emitter';

class Stream<L extends ListenerSignature<L> = DefaultListener> extends TypedEmitter<L> {
}

Then use it with MyClass:

class MyClass extends Stream<MyEvents> {
}

from tiny-typed-emitter.

Stream comes from node's stream module. I'm not able to change its definition :/

from tiny-typed-emitter.

You have 2 options:

1. Add getter emitter or something like that to cast to TypedEmitter:

class MyClass extends Stream {
  get emitter() {
    return this as TypedEmitter<MyEvents>;
  }
}

2. Override EventEmitter methods on MyClass:

interface MyEvents {
  'foo': () => void;
}

class MyClass extends Stream {
  on<E extends keyof MyEvents>(event: E, listener: MyEvents[E]): this {
    return this.on(event, listener);
  }
}

Use this as a reference to override other methods as needed(basically substitute L with MyEvents everywhere and you are good to go).

from tiny-typed-emitter.