is-weakset

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

Example

var isWeakSet = require('is-weakset');
assert(!isWeakSet(function () {}));
assert(!isWeakSet(null));
assert(!isWeakSet(function* () { yield 42; return Infinity; });
assert(!isWeakSet(Symbol('foo')));
assert(!isWeakSet(1n));
assert(!isWeakSet(Object(1n)));

assert(!isWeakSet(new Set()));
assert(!isWeakSet(new WeakMap()));
assert(!isWeakSet(new Map()));

assert(isWeakSet(new WeakSet()));

class MyWeakSet extends WeakSet {}
assert(isWeakSet(new MyWeakSet()));

Tests

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

Current Tags

• 2.0.3                                ...           latest (8 months ago)

6 Versions

• 2.0.3                                ...           8 months ago
• 2.0.2                                ...           3 years ago
• 2.0.1                                ...           5 years ago
• 2.0.0                                ...           5 years ago
• 1.0.1                                ...           9 years ago
• 1.0.0                                ...           10 years ago