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

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Last verified Sep 9, 2026 against expect-type@1.4.0. JSON

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

expect-type ships CommonJS only. require("expect-type") works everywhere. import "expect-type" 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
1.4.0 (Jun 25, 2026)
Module format
CommonJS
Last CommonJS version
1.4.0
TypeScript types
Bundled
Node engines
>=12.0.0
Weekly downloads
78.4M
License
Apache-2.0

Does expect-type@1.4.0 actually load? Runtime test results

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

Runtimerequire("expect-type")import "expect-type"
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-type

ES modules (import)

import expectType from "expect-type";

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 expectType = require("expect-type");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (54 versions; the newest 54 shown).

VersionsFormatFirst published
0.3.1 – 1.4.0CommonJSMar 3, 2020

Frequently asked

Is expect-type ESM-only?

expect-type@1.4.0 is a CommonJS package. expect-type ships CommonJS only. require("expect-type") works everywhere. import "expect-type" 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-type with ES module syntax?

Yes. import expectType from "expect-type" 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-type work in Bun?

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

Does expect-type ship TypeScript types?

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

Links

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