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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. Markdown · JSON

Dual (CommonJS + ESM) Dual package — require() works on every Node.js version we test; import works too

jackspeak publishes both a CommonJS entry and a native ESM entry (ESM added in 2.0.0). require("jackspeak") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js 20 || >=22. import "jackspeak" works alongside it.

What to do

  1. Nothing to change. require("jackspeak") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js 20 || >=22. import * as jackspeak from "jackspeak" works alongside it; use named imports for what the ESM entry exports.
  2. TypeScript: types are bundled; install nothing extra.
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 1.4.0✓ works✓ works

How to import jackspeak

ES modules (import)

import * as jackspeak from "jackspeak";

Namespace import shown because the ESM entry may have no default export; use named imports for what it exports.

CommonJS (require)

const jackspeak = require("jackspeak");

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 (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") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js 20 || >=22. import "jackspeak" works alongside it.

Can I require jackspeak?

Yes. jackspeak ships a CommonJS entry alongside the native ESM entry. require("jackspeak") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js 20 || >=22.

Does jackspeak work in Bun?

Yes. import "jackspeak" loaded successfully in Bun 1.4.0 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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