canirequire › CommonJS › nyc
Is nyc ESM-only? Can you require() it?
the Istanbul command line interface
Last verified Sep 9, 2026 against nyc@18.0.0. JSON
CommonJS CommonJS — require() works on every Node.js version
nyc ships CommonJS only. require("nyc") works everywhere. import "nyc" 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 nyc@18.0.0 actually load? Runtime test results
Installed and executed on Sep 9, 2026 with require("nyc") from a CommonJS file and import "nyc" from an ES module.
| Runtime | require("nyc") | import "nyc" |
|---|---|---|
| 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 nyc
ES modules (import)
import nyc from "nyc";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 nyc = require("nyc");Module format by version
Derived from the type, main and exports fields of every stable release on npm (115 versions; the newest 60 shown).
| Versions | Format | First published |
|---|---|---|
| 6.4.2 – 18.0.0 | CommonJS | May 2, 2016 |
Frequently asked
Is nyc ESM-only?
nyc@18.0.0 is a CommonJS package. nyc ships CommonJS only. require("nyc") works everywhere. import "nyc" 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 nyc with ES module syntax?
Yes. import nyc from "nyc" 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 nyc work in Bun?
Yes. import "nyc" loaded successfully in Bun 1.4 on Sep 9, 2026.
Does nyc ship TypeScript types?
No. nyc ships no type declarations and there is no @types package for it.
Links
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