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test	b6c02717e6 Upload complete no-internet building environment.	1 rok pred
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.travis.yml	b6c02717e6 Upload complete no-internet building environment.	1 rok pred
CHANGELOG.md	b6c02717e6 Upload complete no-internet building environment.	1 rok pred
LICENSE	b6c02717e6 Upload complete no-internet building environment.	1 rok pred
README.md	b6c02717e6 Upload complete no-internet building environment.	1 rok pred
index.js	b6c02717e6 Upload complete no-internet building environment.	1 rok pred
package.json	b6c02717e6 Upload complete no-internet building environment.	1 rok pred

is-weakmap

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

README.md

is-weakmap

Example

Tests