Usage

isWeakMap(new WeakMap()); // => true
isWeakMap(new Map()); // => false

Installation

CLI

npx atmx add helper is-weak-map

Manually

Copy and paste the following method into @/utils/helpers/isWeakMap.ts:

import { isTagged } from "@/helpers/is-tagged.ts";

/**
* Checks if the given value is a WeakMap.
*
* Instances from [other realms][1] are also supported.
*
* [1]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/instanceof#instanceof_and_multiple_realms
*
* @example
* isWeakMap(new WeakMap()) // => true
* isWeakMap(new Map()) // => false
*/
export function isWeakMap<K extends WeakKey = WeakKey, V = unknown>(
value: unknown,
): value is WeakMap<K, V> {
return isTagged(value, "[object WeakMap]");
}