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is-weakmap

2.0.1 • Public • Published

is-weakmap Version Badge

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Is this value a JS WeakMap? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

Example

var isWeakMap = require('is-weakmap');
assert(!isWeakMap(function () {}));
assert(!isWeakMap(null));
assert(!isWeakMap(function* () { yield 42; return Infinity; });
assert(!isWeakMap(Symbol('foo')));
assert(!isWeakMap(1n));
assert(!isWeakMap(Object(1n)));
 
assert(!isWeakMap(new Set()));
assert(!isWeakMap(new WeakSet()));
assert(!isWeakMap(new Map()));
 
assert(isWeakMap(new WeakMap()));
 
class MyWeakMap extends WeakMap {}
assert(isWeakMap(new MyWeakMap()));

Tests

Simply clone the repo, npm install, and run npm test

Install

npm i is-weakmap

DownloadsWeekly Downloads

810,207

Version

2.0.1

License

MIT

Unpacked Size

10.1 kB

Total Files

10

Last publish

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