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Is expect.js ESM-only? Can you require() it?

BDD style assertions for node and the browser.

Last verified Sep 9, 2026 against expect.js@0.3.1. JSON

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

expect.js ships CommonJS only. require("expect.js") works everywhere. import "expect.js" 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.

Latest
0.3.1 (Feb 20, 2014)
Module format
CommonJS
Last CommonJS version
0.3.1
TypeScript types
@types/expect.js
Node engines
not declared
Weekly downloads
108K
License
unknown

Does expect.js@0.3.1 actually load? Runtime test results

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

Runtimerequire("expect.js")import "expect.js"
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✓ works✓ works

How to import expect.js

ES modules (import)

import expectJs from "expect.js";

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 expectJs = require("expect.js");

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
0.1.0 – 0.3.1CommonJSDec 19, 2011

Frequently asked

Is expect.js ESM-only?

expect.js@0.3.1 is a CommonJS package. expect.js ships CommonJS only. require("expect.js") works everywhere. import "expect.js" 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 expect.js with ES module syntax?

Yes. import expectJs from "expect.js" 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 expect.js work in Bun?

Yes. import "expect.js" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does expect.js ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/expect.js".

Links

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