is-weakref
DefinitelyTyped icon, indicating that this package has TypeScript declarations provided by the separate @types/is-weakref package

1.0.2 • Public • Published

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

Example

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

assert(!isWeakRef(new Set()));
assert(!isWeakRef(new WeakSet()));
assert(!isWeakRef(new Map()));
assert(!isWeakRef(new WeakMap()));

assert(isWeakRef(new WeakRef({})));

class MyWeakRef extends WeakRef {}
assert(isWeakRef(new MyWeakRef({})));

Tests

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

Package Sidebar

Install

npm i is-weakref

Weekly Downloads

26,883,920

Version

1.0.2

License

MIT

Unpacked Size

12.1 kB

Total Files

10

Last publish

Collaborators

  • ljharb