react-use/src/useEvent.ts

import { useEffect } from 'react';
import { isBrowser, off, on } from './misc/util';

export interface ListenerType1 {
  addEventListener(name: string, handler: (event?: any) => void, ...args: any[]);

  removeEventListener(name: string, handler: (event?: any) => void, ...args: any[]);
}

export interface ListenerType2 {
  on(name: string, handler: (event?: any) => void, ...args: any[]);

  off(name: string, handler: (event?: any) => void, ...args: any[]);
}

export type UseEventTarget = ListenerType1 | ListenerType2;

const defaultTarget = isBrowser ? window : null;

const isListenerType1 = (target: any): target is ListenerType1 => {
  return !!target.addEventListener;
};
const isListenerType2 = (target: any): target is ListenerType2 => {
  return !!target.on;
};

type AddEventListener<T> = T extends ListenerType1
  ? T['addEventListener']
  : T extends ListenerType2
  ? T['on']
  : never;

export type UseEventOptions<T> = Parameters<AddEventListener<T>>[2];

const useEvent = <T extends UseEventTarget>(
  name: Parameters<AddEventListener<T>>[0],
  handler?: null | undefined | Parameters<AddEventListener<T>>[1],
  target: null | T | Window = defaultTarget,
  options?: UseEventOptions<T>
) => {
  useEffect(() => {
    if (!handler) {
      return;
    }
    if (!target) {
      return;
    }
    if (isListenerType1(target)) {
      on(target, name, handler, options);
    } else if (isListenerType2(target)) {
      target.on(name, handler, options);
    }
    return () => {
      if (isListenerType1(target)) {
        off(target, name, handler, options);
      } else if (isListenerType2(target)) {
        target.off(name, handler, options);
      }
    };
  }, [name, handler, target, JSON.stringify(options)]);
};

export default useEvent;