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Is c8 ESM-only? Can you require() it?

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Last verified Sep 9, 2026 against c8@12.0.0. Markdown · JSON

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

c8 ships CommonJS only. require("c8") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^20.19.0 || ^22.12.0 || >=23. import "c8" 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("c8") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^20.19.0 || ^22.12.0 || >=23.
  2. From ES modules use the default import: import c8 from "c8"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
12.0.0 (Jul 14, 2026)
Module format
CommonJS
Last CommonJS version
12.0.0
TypeScript types
Bundled
Node engines
^20.19.0 || ^22.12.0 || >=23
Weekly downloads
3.7M
License
ISC

Does c8@12.0.0 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("c8") from a CommonJS file and import "c8" from an ES module.

Runtimerequire("c8")import "c8"
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 c8

ES modules (import)

import c8 from "c8";

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 c8 = require("c8");

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 (68 versions; the newest 60 shown).

VersionsFormatFirst published
3.2.0 – 12.0.0CommonJSSep 16, 2018

Frequently asked

Is c8 ESM-only?

c8@12.0.0 is a CommonJS package. c8 ships CommonJS only. require("c8") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js ^20.19.0 || ^22.12.0 || >=23. import "c8" 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 c8 with ES module syntax?

Yes. import c8 from "c8" 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 c8 work in Bun?

Yes. import "c8" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does c8 ship TypeScript types?

Yes. c8 bundles its own type declarations; no @types package is needed.

Links

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