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

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Last verified Sep 9, 2026 against jscs@3.0.7. Markdown · JSON

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

jscs ships CommonJS only. require("jscs") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.10.0. import "jscs" 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("jscs") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.10.0.
  2. From ES modules use the default import: import jscs from "jscs"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: no types are available for jscs; declare the module yourself if you need them.
  4. This package is deprecated: JSCS has merged with ESLint! See - https://medium.com/@markelog/jscs-end-of-the-line-bc9bf0b3fdb2
Latest
3.0.7 (Jul 14, 2016)
Module format
CommonJS
Last CommonJS version
3.0.7
TypeScript types
None
Node engines
>= 0.10.0
Weekly downloads
71K
License
MIT

Deprecated: JSCS has merged with ESLint! See - https://medium.com/@markelog/jscs-end-of-the-line-bc9bf0b3fdb2

Does jscs@3.0.7 actually load? Runtime test results

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

Runtimerequire("jscs")import "jscs"
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 jscs

ES modules (import)

import jscs from "jscs";

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 jscs = require("jscs");

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 (95 versions; the newest 60 shown).

VersionsFormatFirst published
1.4.1 – 3.0.7CommonJSMay 6, 2014

Frequently asked

Is jscs ESM-only?

jscs@3.0.7 is a CommonJS package. jscs ships CommonJS only. require("jscs") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.10.0. import "jscs" 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 jscs with ES module syntax?

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

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

Does jscs ship TypeScript types?

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

Links

Other commonjs packages

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