Function isPromise

packages/shared/src/general.ts:56–62

(val: unknown)

  val !== null && typeof val === 'object'

export const isPromise = <T = any>(val: unknown): val is Promise<T> => {
  return (
    (isObject(val) || isFunction(val)) &&
    isFunction((val as any).then) &&
    isFunction((val as any).catch)
  )
}

export const objectToString: typeof Object.prototype.toString =
  Object.prototype.toString