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canirequire › Dual (CommonJS + ESM) › expect

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

This package exports the `expect` function used in [Jest](https://jestjs.io/). You can find its documentation [on Jest's website](https://jestjs.io/docs/expect).

Last verified Sep 9, 2026 against expect@30.5.1. Markdown · JSON

Dual (CommonJS + ESM) Dual package — require() works on every Node.js version we test; import works too

expect publishes both a CommonJS entry and a native ESM entry (ESM added in 30.0.0). require("expect") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0. import "expect" works alongside it.

What to do

  1. Nothing to change. require("expect") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0. import * as expect from "expect" works alongside it; use named imports for what the ESM entry exports.
  2. TypeScript: types are bundled; install nothing extra.
Latest
30.5.1 (Sep 1, 2026)
Module format
Dual (CommonJS + ESM)
Last CommonJS version
30.5.1
Native ESM since
30.0.0
TypeScript types
Bundled
Node engines
^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0
Weekly downloads
43.6M
License
MIT

Does expect@30.5.1 actually load? Runtime test results

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

Runtimerequire("expect")import "expect"
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 expect

ES modules (import)

import * as expect from "expect";

Namespace import shown because the ESM entry may have no default export; use named imports for what it exports.

CommonJS (require)

const expect = require("expect");

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 (162 versions; the newest 60 shown).

VersionsFormatFirst published
30.0.0 – 30.5.1Dual (CommonJS + ESM)Jun 10, 2025
27.0.6 – 29.7.0CommonJSJun 28, 2021

Frequently asked

Is expect ESM-only?

expect@30.5.1 ships CommonJS and ESM builds. expect publishes both a CommonJS entry and a native ESM entry (ESM added in 30.0.0). require("expect") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0. import "expect" works alongside it.

Can I require expect?

Yes. expect ships a CommonJS entry alongside the native ESM entry. require("expect") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0.

Does expect work in Bun?

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

Does expect ship TypeScript types?

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

Links

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