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Is regexp.prototype.flags ESM-only? Can you require() it?

ES6 spec-compliant RegExp.prototype.flags shim.

Last verified Sep 9, 2026 against regexp.prototype.flags@1.5.4. JSON

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

regexp.prototype.flags ships CommonJS only. require("regexp.prototype.flags") works everywhere. import "regexp.prototype.flags" 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
1.5.4 (Jan 3, 2025)
Module format
CommonJS
Last CommonJS version
1.5.4
TypeScript types
@types/regexp.prototype.flags
Node engines
>= 0.4
Weekly downloads
81.0M
License
MIT

Does regexp.prototype.flags@1.5.4 actually load? Runtime test results

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

Runtimerequire("regexp.prototype.flags")import "regexp.prototype.flags"
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 regexp.prototype.flags

ES modules (import)

import regexpPrototypeFlags from "regexp.prototype.flags";

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 regexpPrototypeFlags = require("regexp.prototype.flags");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (17 versions; the newest 17 shown).

VersionsFormatFirst published
1.0.0 – 1.5.4CommonJSDec 10, 2014

Frequently asked

Is regexp.prototype.flags ESM-only?

regexp.prototype.flags@1.5.4 is a CommonJS package. regexp.prototype.flags ships CommonJS only. require("regexp.prototype.flags") works everywhere. import "regexp.prototype.flags" 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 regexp.prototype.flags with ES module syntax?

Yes. import regexpPrototypeFlags from "regexp.prototype.flags" 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 regexp.prototype.flags work in Bun?

Yes. import "regexp.prototype.flags" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does regexp.prototype.flags ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/regexp.prototype.flags".

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