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History

houwq 38cd670902 Initial commit		2025-06-13 14:04:40 +08:00
..
.github	Initial commit	2025-06-13 14:04:40 +08:00
test	Initial commit	2025-06-13 14:04:40 +08:00
.editorconfig	Initial commit	2025-06-13 14:04:40 +08:00
.eslintrc	Initial commit	2025-06-13 14:04:40 +08:00
.nycrc	Initial commit	2025-06-13 14:04:40 +08:00
CHANGELOG.md	Initial commit	2025-06-13 14:04:40 +08:00
index.d.ts	Initial commit	2025-06-13 14:04:40 +08:00
index.js	Initial commit	2025-06-13 14:04:40 +08:00
LICENSE	Initial commit	2025-06-13 14:04:40 +08:00
package.json	Initial commit	2025-06-13 14:04:40 +08:00
README.md	Initial commit	2025-06-13 14:04:40 +08:00
tsconfig.json	Initial commit	2025-06-13 14:04:40 +08:00

README.md

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