canirequire › CommonJS › undici-types
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. JSON
CommonJS CommonJS — require() works on every Node.js version
undici-types ships CommonJS only. require("undici-types") works everywhere. import "undici-types" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.
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.
| Runtime | require("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 | ✗ failserror: Cannot find package 'undici-types' from '/Users/boat/Projects/top-seo/data/probe-work/undici-types/req.cjs' | ✗ failserror: Cannot find package 'undici-types' from '/Users/boat/Projects/top-seo/data/probe-work/undici-types/imp.mjs' |
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 undiciTypes from "undici-types";Named imports from a CommonJS package only work when Node.js can statically detect them. If a named import fails, use the default import and destructure.
CommonJS (require)
const undiciTypes = require("undici-types");Module format by version
Derived from the type, main and exports fields of every stable release on npm (131 versions; the newest 60 shown).
| Versions | Format | First published |
|---|---|---|
| 7.2.2 – 8.10.2 | CommonJS | Jan 15, 2025 |
Frequently asked
Is undici-types ESM-only?
undici-types@8.10.2 is a CommonJS package. undici-types ships CommonJS only. require("undici-types") works everywhere. import "undici-types" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.
Can I import undici-types with ES module syntax?
Yes. import undiciTypes from "undici-types" works in Node.js and Bun because they support importing CommonJS modules. Named imports work only when Node.js can statically detect the exports.
Does undici-types work in Bun?
Importing undici-types failed in Bun 1.4 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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