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canirequire › Dual (CommonJS + ESM) › @isaacs/cliui

Is @isaacs/cliui ESM-only? Can you require() it?

easily create complex multi-column command-line-interfaces

Last verified Sep 9, 2026 against @isaacs/cliui@9.0.0. JSON

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

@isaacs/cliui publishes both a CommonJS entry and a native ESM entry (ESM added in 8.0.2). require("@isaacs/cliui") and import "@isaacs/cliui" both work on every supported Node.js version and in Bun.

Latest
9.0.0 (Feb 5, 2026)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
9.0.0
Native ESM since
8.0.2
TypeScript types
Bundled
Node engines
>=18
License
BlueOak-1.0.0

Does @isaacs/cliui@9.0.0 actually load? Runtime test results

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

Runtimerequire("@isaacs/cliui")import "@isaacs/cliui"
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 @isaacs/cliui

ES modules (import)

import cliui from "@isaacs/cliui";

CommonJS (require)

const cliui = require("@isaacs/cliui");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (2 versions; the newest 2 shown).

VersionsFormatFirst published
8.0.2 – 9.0.0Dual (CommonJS + ESM)May 2, 2023

Frequently asked

Is @isaacs/cliui ESM-only?

@isaacs/cliui@9.0.0 ships CommonJS and ESM builds. @isaacs/cliui publishes both a CommonJS entry and a native ESM entry (ESM added in 8.0.2). require("@isaacs/cliui") and import "@isaacs/cliui" both work on every supported Node.js version and in Bun.

Can I require @isaacs/cliui?

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

Does @isaacs/cliui work in Bun?

Yes. import "@isaacs/cliui" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does @isaacs/cliui ship TypeScript types?

Yes. @isaacs/cliui bundles its own type declarations; no @types package is needed.

Links

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