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Is is-unicode-supported ESM-only? Can you require() it?

Detect whether the terminal supports Unicode

Last verified Sep 9, 2026 against is-unicode-supported@2.1.0. JSON

ESM-only ESM-only since 1.0.0 — last CommonJS version is 0.1.0

is-unicode-supported dropped its CommonJS build in 1.0.0 (April 2021). The last version you can require() on every Node.js version, including 18 and older, is 0.1.0, published Mar 17, 2021.

On Node.js 20.19+, 22.12+ and every newer release, require("is-unicode-supported") works anyway: Node can load synchronous ES modules through require(). Verified on Node 20, 22, 24, 26. Node.js 18 and older still fail with ERR_REQUIRE_ESM.

Latest
2.1.0 (Sep 9, 2024)
Module format
ESM-only
Last CommonJS version
0.1.0
ESM-only since
1.0.0 (Apr 18, 2021)
TypeScript types
Bundled
Node engines
>=18
Weekly downloads
59.5M
License
MIT

Does is-unicode-supported@2.1.0 actually load? Runtime test results

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

Runtimerequire("is-unicode-supported")import "is-unicode-supported"
Node.js 18✗ failsERR_REQUIRE_ESM✓ 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 is-unicode-supported

ES modules (import)

import isUnicodeSupported from "is-unicode-supported";

CommonJS (require)

// Node.js 20.19+ / 22.12+ / newer (package has no top-level await):
const isUnicodeSupported = require("is-unicode-supported");

// Any Node.js version:
const isUnicodeSupported = await import("is-unicode-supported");

// Or pin the last CommonJS release:
// npm install is-unicode-supported@0.1.0

Module format by version

Derived from the type, main and exports fields of every stable release on npm (7 versions; the newest 7 shown).

VersionsFormatFirst published
1.0.0 – 2.1.0ESM-onlyApr 18, 2021
0.1.0CommonJSMar 17, 2021

Frequently asked

Is is-unicode-supported ESM-only?

is-unicode-supported@2.1.0 is ESM-only. is-unicode-supported dropped its CommonJS build in 1.0.0 (April 2021). The last version you can require() on every Node.js version, including 18 and older, is 0.1.0, published Mar 17, 2021.

Which version of is-unicode-supported still supports CommonJS / require()?

0.1.0 is the last version of is-unicode-supported with a CommonJS build. Install it with "npm install is-unicode-supported@0.1.0". Every version from 1.0.0 on is ESM-only.

How do I use is-unicode-supported from a CommonJS file?

Use a dynamic import: const mod = await import("is-unicode-supported"). On Node.js 20.19+, 22.12+ and newer, a plain require("is-unicode-supported") also works for ESM packages that do not use top-level await. Alternatively pin is-unicode-supported@0.1.0.

Does is-unicode-supported work in Bun?

Yes. import "is-unicode-supported" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does is-unicode-supported ship TypeScript types?

Yes. is-unicode-supported bundles its own type declarations; no @types package is needed.

Links

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