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

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Last verified Sep 9, 2026 against nyc@18.0.0. Markdown · JSON

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

nyc ships CommonJS only. require("nyc") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js 20 || >=22. 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.

What to do

  1. require("nyc") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js 20 || >=22.
  2. From ES modules use the default import: import nyc from "nyc"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: no types are available for nyc; declare the module yourself if you need them.
Latest
18.0.0 (Feb 22, 2026)
Module format
CommonJS
Last CommonJS version
18.0.0
TypeScript types
None
Node engines
20 || >=22
Weekly downloads
7.5M
License
ISC

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.

Runtimerequire("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 1.4.0✓ 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, corrected where a runtime test of that version contradicted them (115 versions; the newest 60 shown).

VersionsFormatFirst published
6.4.2 – 18.0.0CommonJSMay 2, 2016

Frequently asked

Is nyc ESM-only?

nyc@18.0.0 is a CommonJS package. nyc ships CommonJS only. require("nyc") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js 20 || >=22. 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 1.4.0 on Sep 9, 2026.

Does nyc ship TypeScript types?

No. nyc ships no type declarations and there is no @types package for it.

Links

Other commonjs packages

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