clean-css-lu

library3.4.7jsnpmunverified

A fast and efficient Node.js library for minifying CSS files. Version 3.4.7 is the latest stable release of the 3.x series. It provides both a CLI and a programmable API. Key differentiators include high performance, support for advanced optimizations like semantic merging and shorthand compacting, source map generation, and compatibility modes for IE7/IE8.

testing

npm install clean-css-lu

github ↗package ↗homepage ↗

INSTALL

IMPORT

SIG · CLEAN-CSS-LU

clean-css-lu

testingjavascriptv3.4.7

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

CleanCSS

✓ var CleanCSS = require('clean-css');

✗ import CleanCSS from 'clean-css';

clean-css v3 is CommonJS-only; ESM import is not supported.

CleanCSS.minify

✓ new CleanCSS().minify(source).styles;

✗ CleanCSS.minify(source);

minify is an instance method, not a static method.

CLI

✓ cleancss -o output.css input.css

✗ clean-css -o output.css input.css

The CLI command is `cleancss`, not `clean-css`.

Minify a simple CSS string using the clean-css API and print the result.

var CleanCSS = require('clean-css'); var source = 'a{font-weight:bold;}'; var minified = new CleanCSS().minify(source).styles; console.log(minified); // 'a{font-weight:700}'

Debug

Known issues

gotchaminify() returns an object with .styles, not just the string.

fix

Access result.styles after calling new CleanCSS().minify(source).

affects: >=3.0.0

gotchaAPI is callback-based in v4 but synchronous in v3. Upgrading to v4 requires changing code that relies on sync output.

fix

If upgrading to v4, use the promise-based or callback-based minify method.

affects: >=3.0.0 <4.0.0

deprecatedNode.js 0.10 and io.js 3.0 are no longer supported by the ecosystem.

fix

Use Node.js >=4.0.0 for security updates.

affects: >=3.0.0 <3.4.7

gotchaThe CLI does not support glob patterns out of the box.

fix

Use shell expansion or pass multiple files explicitly (e.g., cleancss file1.css file2.css).

affects: >=3.0.0

Errors

Common errors & fixes

Error: Cannot find module 'clean-css'

clean-css is not installed or is installed globally but required locally.

fix

Run 'npm install clean-css' in your project directory.

TypeError: CleanCSS is not a constructor

Using import or require incorrectly (e.g., CleanCSS = require('clean-css').CleanCSS).

fix

Use 'var CleanCSS = require('clean-css');' and then 'new CleanCSS()'.

clean-css: command not found

clean-css CLI is not installed globally or not in PATH.

fix

Install globally: 'npm install -g clean-css' or use npx: 'npx clean-css --help'.

TypeError: source is not a string

Passing non-string input to minify().

fix

Ensure the argument to minify() is a CSS string.

Upgrade

Version history

3.4.7latest on npm

Audit

Dependencies

No dependency data recorded yet.

Agent activity

12 hits · last 30 days

node

OpenAI (training)

Resources

githubhttps://github.com/jakubpawlowicz/clean-css ↗

packageclean-css-lu ↗

homepagehttps://github.com/jakubpawlowicz/clean-css ↗