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Is @babel/plugin-proposal-class-properties ESM-only? Can you require() it?

This plugin transforms static class properties as well as properties declared with the property initializer syntax

Last verified Sep 9, 2026 against @babel/plugin-proposal-class-properties@7.18.6. Markdown · JSON

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

@babel/plugin-proposal-class-properties ships CommonJS only. require("@babel/plugin-proposal-class-properties") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=6.9.0. import "@babel/plugin-proposal-class-properties" 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("@babel/plugin-proposal-class-properties") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=6.9.0.
  2. From ES modules use the default import: import pluginProposalClassProperties from "@babel/plugin-proposal-class-properties"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: no types are available for @babel/plugin-proposal-class-properties; declare the module yourself if you need them.
  4. This package is deprecated: This proposal has been merged to the ECMAScript standard and thus this plugin is no longer maintained. Please use @babel/plugin-transform-class-properties instead.
Latest
7.18.6 (Jun 27, 2022)
Module format
CommonJS
Last CommonJS version
7.18.6
TypeScript types
None
Node engines
>=6.9.0
Weekly downloads
10.8M
License
MIT

Deprecated: This proposal has been merged to the ECMAScript standard and thus this plugin is no longer maintained. Please use @babel/plugin-transform-class-properties instead.

Does @babel/plugin-proposal-class-properties@7.18.6 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("@babel/plugin-proposal-class-properties") from a CommonJS file and import "@babel/plugin-proposal-class-properties" from an ES module.

Runtimerequire("@babel/plugin-proposal-class-properties")import "@babel/plugin-proposal-class-properties"
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 @babel/plugin-proposal-class-properties

ES modules (import)

import pluginProposalClassProperties from "@babel/plugin-proposal-class-properties";

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 pluginProposalClassProperties = require("@babel/plugin-proposal-class-properties");

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 (27 versions; the newest 27 shown).

VersionsFormatFirst published
7.0.0 – 7.18.6CommonJSAug 27, 2018

Frequently asked

Is @babel/plugin-proposal-class-properties ESM-only?

@babel/plugin-proposal-class-properties@7.18.6 is a CommonJS package. @babel/plugin-proposal-class-properties ships CommonJS only. require("@babel/plugin-proposal-class-properties") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=6.9.0. import "@babel/plugin-proposal-class-properties" 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 @babel/plugin-proposal-class-properties with ES module syntax?

Yes. import pluginProposalClassProperties from "@babel/plugin-proposal-class-properties" 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 @babel/plugin-proposal-class-properties work in Bun?

Yes. import "@babel/plugin-proposal-class-properties" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does @babel/plugin-proposal-class-properties ship TypeScript types?

No. @babel/plugin-proposal-class-properties ships no type declarations and there is no @types package for it.

Links

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