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

Make a callback- or promise-based function support both promises and callbacks.

Last verified Sep 9, 2026 against universalify@2.0.1. JSON

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

universalify ships CommonJS only. require("universalify") works everywhere. import "universalify" 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
2.0.1 (Nov 1, 2023)
Module format
CommonJS
Last CommonJS version
2.0.1
TypeScript types
@types/universalify
Node engines
>= 10.0.0
Weekly downloads
144.1M
License
MIT

Does universalify@2.0.1 actually load? Runtime test results

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

Runtimerequire("universalify")import "universalify"
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 universalify

ES modules (import)

import universalify from "universalify";

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 universalify = require("universalify");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (8 versions; the newest 8 shown).

VersionsFormatFirst published
0.0.1 – 2.0.1CommonJSApr 8, 2017

Frequently asked

Is universalify ESM-only?

universalify@2.0.1 is a CommonJS package. universalify ships CommonJS only. require("universalify") works everywhere. import "universalify" 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 universalify with ES module syntax?

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

Yes. import "universalify" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does universalify ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/universalify".

Links

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