import type { KeybindEvent } from "./types";

type Listener = (event: KeybindEvent) => void;

export class KeybindEmitter {
  private listeners: Listener[] = [];

  on(listener: Listener) {
    this.listeners.push(listener);
    return () => this.off(listener);
  }

  off(listener: Listener) {
    this.listeners = this.listeners.filter(l => l !== listener);
  }

  emit<T extends KeybindEvent["type"]>(
    event: Extract<KeybindEvent, { type: T }>
  ) {
    for (const l of this.listeners) l(event);
  }
}