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

Unopinionated, no-frills CLI argument parser

Last verified Sep 9, 2026 against arg@5.0.2. Markdown · JSON

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

arg ships CommonJS only. require("arg") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "arg" 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("arg") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.
  2. From ES modules use the default import: import arg from "arg"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
5.0.2 (Jun 5, 2022)
Module format
CommonJS
Last CommonJS version
5.0.2
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
71.2M
License
MIT

Does arg@5.0.2 actually load? Runtime test results

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

Runtimerequire("arg")import "arg"
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 arg

ES modules (import)

import arg from "arg";

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 arg = require("arg");

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 (14 versions; the newest 14 shown).

VersionsFormatFirst published
0.0.1 – 5.0.2CommonJSJun 1, 2012

Frequently asked

Is arg ESM-only?

arg@5.0.2 is a CommonJS package. arg ships CommonJS only. require("arg") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "arg" 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 arg with ES module syntax?

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

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

Does arg ship TypeScript types?

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

Links

Other commonjs packages

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