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canirequire › Dual (CommonJS + ESM) › jackspeak

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

A very strict and proper argument parser.

Last verified Sep 9, 2026 against jackspeak@4.2.3. JSON

Dual (CommonJS + ESM) Dual package — both require() and import work

jackspeak publishes both a CommonJS entry and a native ESM entry (ESM added in 2.0.0). require("jackspeak") and import "jackspeak" both work on every supported Node.js version and in Bun.

Latest
4.2.3 (Feb 7, 2026)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
4.2.3
Native ESM since
2.0.0
TypeScript types
Bundled
Node engines
20 || >=22
Weekly downloads
101.7M
License
BlueOak-1.0.0

Does jackspeak@4.2.3 actually load? Runtime test results

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

Runtimerequire("jackspeak")import "jackspeak"
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 jackspeak

ES modules (import)

import jackspeak from "jackspeak";

CommonJS (require)

const jackspeak = require("jackspeak");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (66 versions; the newest 60 shown).

VersionsFormatFirst published
2.0.0 – 4.2.3Dual (CommonJS + ESM)Apr 10, 2023
1.3.0 – 1.4.2CommonJSFeb 1, 2019

Frequently asked

Is jackspeak ESM-only?

jackspeak@4.2.3 ships CommonJS and ESM builds. jackspeak publishes both a CommonJS entry and a native ESM entry (ESM added in 2.0.0). require("jackspeak") and import "jackspeak" both work on every supported Node.js version and in Bun.

Can I require jackspeak?

Yes. jackspeak ships a CommonJS entry, so require("jackspeak") works on every Node.js version, alongside the native ESM entry for import.

Does jackspeak work in Bun?

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

Does jackspeak ship TypeScript types?

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

Links

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