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

Is this value a JS regex? Works cross-realm/iframe, and despite ES6 @@toStringTag

Last verified Sep 9, 2026 against is-regex@1.2.1. JSON

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

is-regex ships CommonJS only. require("is-regex") works everywhere. import "is-regex" 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
1.2.1 (Dec 12, 2024)
Module format
CommonJS
Last CommonJS version
1.2.1
TypeScript types
Bundled
Node engines
>= 0.4
Weekly downloads
75.1M
License
MIT

Does is-regex@1.2.1 actually load? Runtime test results

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

Runtimerequire("is-regex")import "is-regex"
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-regex

ES modules (import)

import isRegex from "is-regex";

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 isRegex = require("is-regex");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (14 versions; the newest 14 shown).

VersionsFormatFirst published
0.0.0 – 1.2.1CommonJSJan 15, 2014

Frequently asked

Is is-regex ESM-only?

is-regex@1.2.1 is a CommonJS package. is-regex ships CommonJS only. require("is-regex") works everywhere. import "is-regex" 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-regex with ES module syntax?

Yes. import isRegex from "is-regex" 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-regex work in Bun?

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

Does is-regex ship TypeScript types?

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

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