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

type-check allows you to check the types of JavaScript values at runtime with a Haskell like type syntax.

Last verified Sep 9, 2026 against type-check@0.4.0. Markdown · JSON

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

type-check ships CommonJS only. require("type-check") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.8.0. import "type-check" 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("type-check") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.8.0.
  2. From ES modules use the default import: import typeCheck from "type-check"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: npm install -D @types/type-check
Latest
0.4.0 (Apr 3, 2020)
Module format
CommonJS
Last CommonJS version
0.4.0
TypeScript types
@types/type-check
Node engines
>= 0.8.0
Weekly downloads
101.4M
License
MIT

Does type-check@0.4.0 actually load? Runtime test results

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

Runtimerequire("type-check")import "type-check"
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 type-check

ES modules (import)

import typeCheck from "type-check";

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 typeCheck = require("type-check");

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 (6 versions; the newest 6 shown).

VersionsFormatFirst published
0.1.0 – 0.4.0CommonJSSep 29, 2013

Frequently asked

Is type-check ESM-only?

type-check@0.4.0 is a CommonJS package. type-check ships CommonJS only. require("type-check") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.8.0. import "type-check" 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 type-check with ES module syntax?

Yes. import typeCheck from "type-check" 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 type-check work in Bun?

Yes. import "type-check" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does type-check ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/type-check".

Links

Other commonjs packages

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