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Is is-finalizationregistry ESM-only? Can you require() it?

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

Last verified Sep 9, 2026 against is-finalizationregistry@1.1.1. JSON

CommonJS CommonJS — require() works on every Node.js version

is-finalizationregistry ships CommonJS only. require("is-finalizationregistry") works everywhere. import "is-finalizationregistry" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

Latest
1.1.1 (Dec 17, 2024)
Module format
CommonJS
Last CommonJS version
1.1.1
TypeScript types
Bundled
Node engines
>= 0.4
Weekly downloads
53.7M
License
MIT

Does is-finalizationregistry@1.1.1 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("is-finalizationregistry") from a CommonJS file and import "is-finalizationregistry" from an ES module.

Runtimerequire("is-finalizationregistry")import "is-finalizationregistry"
Node.js 18✓ works✓ works
Node.js 20✓ works✓ works
Node.js 22✓ works✓ works
Node.js 24✓ works✓ works
Node.js 26✓ works✓ works
Bun 1.4✓ works✓ works

How to import is-finalizationregistry

ES modules (import)

import isFinalizationregistry from "is-finalizationregistry";

Named imports from a CommonJS package only work when Node.js can statically detect them. If a named import fails, use the default import and destructure.

CommonJS (require)

const isFinalizationregistry = require("is-finalizationregistry");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (5 versions; the newest 5 shown).

VersionsFormatFirst published
1.0.0 – 1.1.1CommonJSAug 2, 2020

Frequently asked

Is is-finalizationregistry ESM-only?

is-finalizationregistry@1.1.1 is a CommonJS package. is-finalizationregistry ships CommonJS only. require("is-finalizationregistry") works everywhere. import "is-finalizationregistry" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

Can I import is-finalizationregistry with ES module syntax?

Yes. import isFinalizationregistry from "is-finalizationregistry" works in Node.js and Bun because they support importing CommonJS modules. Named imports work only when Node.js can statically detect the exports.

Does is-finalizationregistry work in Bun?

Yes. import "is-finalizationregistry" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does is-finalizationregistry ship TypeScript types?

Yes. is-finalizationregistry bundles its own type declarations; no @types package is needed.

Links

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