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Is yeoman-assert ESM-only? Can you require() it?

Assert utility from yeoman

Last verified Sep 9, 2026 against yeoman-assert@3.1.1. Markdown · JSON

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

yeoman-assert ships CommonJS only. require("yeoman-assert") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=4. import "yeoman-assert" 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.

What to do

  1. require("yeoman-assert") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=4.
  2. From ES modules use the default import: import yeomanAssert from "yeoman-assert"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: npm install -D @types/yeoman-assert
  4. This package is deprecated: This package is deprecated. See: https://github.com/yeoman/yeoman/issues/1779
Latest
3.1.1 (Mar 25, 2018)
Module format
CommonJS
Last CommonJS version
3.1.1
TypeScript types
@types/yeoman-assert
Node engines
>=4
Weekly downloads
38K
License
BSD-2-Clause

Deprecated: This package is deprecated. See: https://github.com/yeoman/yeoman/issues/1779

Does yeoman-assert@3.1.1 actually load? Runtime test results

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

Runtimerequire("yeoman-assert")import "yeoman-assert"
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 yeoman-assert

ES modules (import)

import yeomanAssert from "yeoman-assert";

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 yeomanAssert = require("yeoman-assert");

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 (12 versions; the newest 12 shown).

VersionsFormatFirst published
1.0.0 – 3.1.1CommonJSNov 16, 2014

Frequently asked

Is yeoman-assert ESM-only?

yeoman-assert@3.1.1 is a CommonJS package. yeoman-assert ships CommonJS only. require("yeoman-assert") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=4. import "yeoman-assert" 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 yeoman-assert with ES module syntax?

Yes. import yeomanAssert from "yeoman-assert" 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 yeoman-assert work in Bun?

Yes. import "yeoman-assert" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does yeoman-assert ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/yeoman-assert".

Links

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