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Is yup ESM-only? Can you require() it?

Dead simple Object schema validation

Last verified Sep 9, 2026 against yup@1.7.1. Markdown · JSON

CommonJS CommonJS — require() works on every Node.js version we test

yup ships CommonJS only. require("yup") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "yup" 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.

It also declares a "module" field, so bundlers such as webpack, Vite and esbuild pick up an ESM build for tree-shaking.

What to do

  1. require("yup") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.
  2. From ES modules use the default import: import yup from "yup"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
1.7.1 (Sep 21, 2025)
Module format
CommonJS
Last CommonJS version
1.7.1
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
10.6M
License
MIT

Does yup@1.7.1 actually load? Runtime test results

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

Runtimerequire("yup")import "yup"
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 1.4.0✓ works✓ works

How to import yup

ES modules (import)

import yup from "yup";

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 yup = require("yup");

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 (119 versions; the newest 60 shown).

VersionsFormatFirst published
0.22.0 – 1.7.1CommonJSAug 26, 2017

Frequently asked

Is yup ESM-only?

yup@1.7.1 is a CommonJS package. yup ships CommonJS only. require("yup") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "yup" 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 yup with ES module syntax?

Yes. import yup from "yup" 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 yup work in Bun?

Yes. import "yup" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does yup ship TypeScript types?

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

Links

Other commonjs packages

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