canirequire › CommonJS › c8
Is c8 ESM-only? Can you require() it?
output coverage reports using Node.js' built in coverage
Last verified Sep 9, 2026 against c8@12.0.0. JSON
CommonJS CommonJS — require() works on every Node.js version
c8 ships CommonJS only. require("c8") works everywhere. 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.
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.
| Runtime | require("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 | ✓ 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 (68 versions; the newest 60 shown).
| Versions | Format | First published |
|---|---|---|
| 3.2.0 – 12.0.0 | CommonJS | Sep 16, 2018 |
Frequently asked
Is c8 ESM-only?
c8@12.0.0 is a CommonJS package. c8 ships CommonJS only. require("c8") works everywhere. 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 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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