Function isFunction

packages/vant/src/utils/basic.ts:21–22

(val: unknown)

// eslint-disable-next-line @typescript-eslint/ban-types
export const isFunction = (val: unknown): val is Function =>
  typeof val === 'function';

export const isPromise = <T = any>(val: unknown): val is Promise<T> =>
  isObject(val) && isFunction(val.then) && isFunction(val.catch);