import { isObjNotNull } from '../obj/check/isObjNotNull'
import { toStringTag } from '../kind'

/**
 * Checks if `value` is classified as a `WeakMap` object.
 *
 * @since 5.0.0-beta.4
 * @category Lang
 * @param {*} x The value to check.
 * @return {boolean} Returns `true` if `value` is a weak map, else `false`.
 *
 * @example
 *
 *   isWeakMap(new WeakMap)
 *   //=> true
 *
 *   isWeakMap(new Map)
 *   //=> false
 *
 */
function isWeakMap<Type>(x: any): x is WeakMap<any, any> {
  return isObjNotNull(x) && toStringTag(x) === '[object WeakMap]'
}

export { isWeakMap }
export default isWeakMap