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Is reusify ESM-only? Can you require() it?

Reuse objects and functions with style

Last verified Sep 9, 2026 against reusify@1.1.0. Markdown · JSON

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

reusify ships CommonJS only. require("reusify") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=0.10.0. import "reusify" 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.

What to do

  1. require("reusify") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=0.10.0.
  2. From ES modules use the default import: import reusify from "reusify"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
1.1.0 (Feb 25, 2025)
Module format
CommonJS
Last CommonJS version
1.1.0
TypeScript types
Bundled
Node engines
>=0.10.0
Weekly downloads
91.0M
License
MIT

Does reusify@1.1.0 actually load? Runtime test results

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

Runtimerequire("reusify")import "reusify"
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 1.4.0✓ works✓ works

How to import reusify

ES modules (import)

import reusify from "reusify";

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 reusify = require("reusify");

Module format by version

Derived from the type, main and exports fields of every stable release on npm, corrected where a runtime test of that version contradicted them (6 versions; the newest 6 shown).

VersionsFormatFirst published
1.0.0 – 1.1.0CommonJSSep 11, 2015

Frequently asked

Is reusify ESM-only?

reusify@1.1.0 is a CommonJS package. reusify ships CommonJS only. require("reusify") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=0.10.0. import "reusify" 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 reusify with ES module syntax?

Yes. import reusify from "reusify" 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 reusify work in Bun?

Yes. import "reusify" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does reusify ship TypeScript types?

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

Links

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