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Is is-fullwidth-code-point ESM-only? Can you require() it?

Check if the character represented by a given Unicode code point is fullwidth

Last verified Sep 9, 2026 against is-fullwidth-code-point@5.1.0. JSON

ESM-only ESM-only since 4.0.0 — last CommonJS version is 3.0.0

is-fullwidth-code-point dropped its CommonJS build in 4.0.0 (April 2021). The last version you can require() on every Node.js version, including 18 and older, is 3.0.0, published Mar 18, 2019.

On Node.js 20.19+, 22.12+ and every newer release, require("is-fullwidth-code-point") 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
5.1.0 (Aug 31, 2025)
Module format
ESM-only
Last CommonJS version
3.0.0
ESM-only since
4.0.0 (Apr 16, 2021)
TypeScript types
Bundled
Node engines
>=18
Weekly downloads
232.7M
License
MIT

Does is-fullwidth-code-point@5.1.0 actually load? Runtime test results

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

Runtimerequire("is-fullwidth-code-point")import "is-fullwidth-code-point"
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-fullwidth-code-point

ES modules (import)

import isFullwidthCodePoint from "is-fullwidth-code-point";

CommonJS (require)

// Node.js 20.19+ / 22.12+ / newer (package has no top-level await):
const isFullwidthCodePoint = require("is-fullwidth-code-point");

// Any Node.js version:
const isFullwidthCodePoint = await import("is-fullwidth-code-point");

// Or pin the last CommonJS release:
// npm install is-fullwidth-code-point@3.0.0

Module format by version

Derived from the type, main and exports fields of every stable release on npm (6 versions; the newest 6 shown).

VersionsFormatFirst published
4.0.0 – 5.1.0ESM-onlyApr 16, 2021
1.0.0 – 3.0.0CommonJSJul 16, 2015

Frequently asked

Is is-fullwidth-code-point ESM-only?

is-fullwidth-code-point@5.1.0 is ESM-only. is-fullwidth-code-point dropped its CommonJS build in 4.0.0 (April 2021). The last version you can require() on every Node.js version, including 18 and older, is 3.0.0, published Mar 18, 2019.

Which version of is-fullwidth-code-point still supports CommonJS / require()?

3.0.0 is the last version of is-fullwidth-code-point with a CommonJS build. Install it with "npm install is-fullwidth-code-point@3.0.0". Every version from 4.0.0 on is ESM-only.

How do I use is-fullwidth-code-point from a CommonJS file?

Use a dynamic import: const mod = await import("is-fullwidth-code-point"). On Node.js 20.19+, 22.12+ and newer, a plain require("is-fullwidth-code-point") also works for ESM packages that do not use top-level await. Alternatively pin is-fullwidth-code-point@3.0.0.

Does is-fullwidth-code-point work in Bun?

Yes. import "is-fullwidth-code-point" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does is-fullwidth-code-point ship TypeScript types?

Yes. is-fullwidth-code-point bundles its own type declarations; no @types package is needed.

Links

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