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Is undici-types ESM-only? Can you require() it?

A stand-alone types package for Undici

Last verified Sep 9, 2026 against undici-types@8.10.2. Markdown · JSON

No JS entry point No JavaScript entry point

undici-types does not expose a JavaScript entry point in package.json. It is likely a CLI, a stylesheet, a type-definition package, or an asset bundle, so require() and import are not the way to use it.

What to do

  1. Do not require() or import undici-types: it has no JavaScript entry point. Use it as a CLI (npx undici-types), a stylesheet, an asset, or a type-definition package as its README describes.
  2. TypeScript: types are bundled; install nothing extra.
Latest
8.10.2 (Sep 4, 2026)
Module format
No JS entry point
Last CommonJS version
n/a
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
284.0M
License
MIT

Does undici-types@8.10.2 actually load? Runtime test results

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

Runtimerequire("undici-types")import "undici-types"
Node.js 18✗ failsMODULE_NOT_FOUND✗ failsERR_MODULE_NOT_FOUND
Node.js 20✗ failsMODULE_NOT_FOUND✗ failsERR_MODULE_NOT_FOUND
Node.js 22✗ failsMODULE_NOT_FOUND✗ failsERR_MODULE_NOT_FOUND
Node.js 24✗ failsMODULE_NOT_FOUND✗ failsERR_MODULE_NOT_FOUND
Node.js 26✗ failsMODULE_NOT_FOUND✗ failsERR_MODULE_NOT_FOUND
Bun 1.4.0✗ failsError✗ failsError

A failing require() on a CommonJS package usually means the package needs a browser/DOM global, a peer dependency, or a native binary that is not available in a bare Node.js process.

How to import undici-types

ES modules (import)

import * as undiciTypes from "undici-types";

CommonJS (require)

Not applicable.

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 (131 versions; the newest 60 shown).

VersionsFormatFirst published
7.2.2 – 8.10.2No JS entry pointJan 15, 2025

Frequently asked

Is undici-types ESM-only?

undici-types@8.10.2 has no importable main entry. undici-types does not expose a JavaScript entry point in package.json. It is likely a CLI, a stylesheet, a type-definition package, or an asset bundle, so require() and import are not the way to use it.

Does undici-types work in Bun?

Importing undici-types failed in Bun 1.4.0 on Sep 9, 2026: error: Cannot find package 'undici-types' from '/Users/boat/Projects/top-seo/data/probe-work/undici-types/imp.mjs'

Does undici-types ship TypeScript types?

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

Links

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