react-use/src/misc/util.ts

export const noop = () => {};

export function on<T extends Window | Document | HTMLElement | EventTarget>(
  obj: T | null,
  ...args: Parameters<T['addEventListener']> | [string, Function | null, ...any]
): void {
  if (obj && obj.addEventListener) {
    obj.addEventListener(...(args as Parameters<HTMLElement['addEventListener']>));
  }
}

export function off<T extends Window | Document | HTMLElement | EventTarget>(
  obj: T | null,
  ...args: Parameters<T['removeEventListener']> | [string, Function | null, ...any]
): void {
  if (obj && obj.removeEventListener) {
    obj.removeEventListener(...(args as Parameters<HTMLElement['removeEventListener']>));
  }
}

export const isBrowser = typeof window !== 'undefined';

export const isNavigator = typeof navigator !== 'undefined';