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Is optimize-css-assets-webpack-plugin ESM-only? Can you require() it?

A Webpack plugin to optimize \ minimize CSS assets.

Last verified Sep 9, 2026 against optimize-css-assets-webpack-plugin@6.0.1. JSON

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

optimize-css-assets-webpack-plugin ships CommonJS only. require("optimize-css-assets-webpack-plugin") works everywhere. import "optimize-css-assets-webpack-plugin" 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.

Latest
6.0.1 (Jun 23, 2021)
Module format
CommonJS
Last CommonJS version
6.0.1
TypeScript types
@types/optimize-css-assets-webpack-plugin
Node engines
not declared
Weekly downloads
1.0M
License
MIT

Does optimize-css-assets-webpack-plugin@6.0.1 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("optimize-css-assets-webpack-plugin") from a CommonJS file and import "optimize-css-assets-webpack-plugin" from an ES module.

Runtimerequire("optimize-css-assets-webpack-plugin")import "optimize-css-assets-webpack-plugin"
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 optimize-css-assets-webpack-plugin

ES modules (import)

import optimizeCssAssetsWebpackPlugin from "optimize-css-assets-webpack-plugin";

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 optimizeCssAssetsWebpackPlugin = require("optimize-css-assets-webpack-plugin");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (27 versions; the newest 27 shown).

VersionsFormatFirst published
1.0.0 – 6.0.1CommonJSJan 9, 2016

Frequently asked

Is optimize-css-assets-webpack-plugin ESM-only?

optimize-css-assets-webpack-plugin@6.0.1 is a CommonJS package. optimize-css-assets-webpack-plugin ships CommonJS only. require("optimize-css-assets-webpack-plugin") works everywhere. import "optimize-css-assets-webpack-plugin" 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 optimize-css-assets-webpack-plugin with ES module syntax?

Yes. import optimizeCssAssetsWebpackPlugin from "optimize-css-assets-webpack-plugin" 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 optimize-css-assets-webpack-plugin work in Bun?

Yes. import "optimize-css-assets-webpack-plugin" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does optimize-css-assets-webpack-plugin ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/optimize-css-assets-webpack-plugin".

Links

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