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Is regexpu-core ESM-only? Can you require() it?

regexpu’s core functionality (i.e. `rewritePattern(pattern, flag)`), capable of translating ES6 Unicode regular expressions to ES5.

Last verified Sep 9, 2026 against regexpu-core@6.4.0. Markdown · JSON

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

regexpu-core ships CommonJS only. require("regexpu-core") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=4. import "regexpu-core" 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("regexpu-core") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=4.
  2. From ES modules use the default import: import regexpuCore from "regexpu-core"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
6.4.0 (Sep 22, 2025)
Module format
CommonJS
Last CommonJS version
6.4.0
TypeScript types
Bundled
Node engines
>=4
Weekly downloads
43.0M
License
MIT

Does regexpu-core@6.4.0 actually load? Runtime test results

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

Runtimerequire("regexpu-core")import "regexpu-core"
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 regexpu-core

ES modules (import)

import regexpuCore from "regexpu-core";

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 regexpuCore = require("regexpu-core");

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 (53 versions; the newest 53 shown).

VersionsFormatFirst published
1.0.0 – 6.4.0CommonJSJan 11, 2016

Frequently asked

Is regexpu-core ESM-only?

regexpu-core@6.4.0 is a CommonJS package. regexpu-core ships CommonJS only. require("regexpu-core") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=4. import "regexpu-core" 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 regexpu-core with ES module syntax?

Yes. import regexpuCore from "regexpu-core" 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 regexpu-core work in Bun?

Yes. import "regexpu-core" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does regexpu-core ship TypeScript types?

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

Links

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