is-finalizationregistry

is-finalizationregistry

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

Example

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

assert(!isFinalizationRegistry(new Set()));
assert(!isFinalizationRegistry(new WeakSet()));
assert(!isFinalizationRegistry(new Map()));
assert(!isFinalizationRegistry(new WeakMap()));
assert(!isFinalizationRegistry(new WeakRef({})));

assert(isFinalizationRegistry(new FinalizationRegistry(function () {})));

class MyFinalizationRegistry extends FinalizationRegistry {}
assert(isFinalizationRegistry(new MyFinalizationRegistry(function () {})));

Tests

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

Changelog

v1.1.0 - 2024-11-23

Commits

• [actions] reuse common workflows b9b56fe
• [meta] use npmignore to autogenerate an npmignore file 4b65c3d
• [New] add TS types 22c7c81
• [actions] split out node 10-20, and 20+ b4bc95a
• [Dev Deps] update eslint, @ljharb/eslint-config, object-inspect, safe-publish-latest, tape 25d2e81
• [Dev Deps] update eslint, @ljharb/eslint-config, aud, auto-changelog, object-inspect, tape a045ec6
• [actions] update rebase action to use reusable workflow 14ee45b
• [actions] update codecov uploader d37bfcb
• [Dev Deps] update @ljharb/eslint-config, auto-changelog, npmignore, object-inspect, tape a36b69c
• [meta] clean up exports 35b3562
• [meta] add missing engines.node 0603193
• [Tests] replace aud with npm audit 05b4596
• [Deps] update call-bind 6482025
• [Dev Deps] add missing peer dep 90f97dd