Registry / devops / uglifyjs-3-webpack-plugin

uglifyjs-3-webpack-plugin

library1.2.4jsnpmunverified

Webpack plugin that uses UglifyJS v3 to minify JavaScript. Version 1.2.4 was last released in 2018 and is compatible with webpack 2, 3, and 4. It wraps UglifyJS 3 (ES6+ support) and offers caching, parallelization, source maps, and comment extraction. Unlike the official uglifyjs-webpack-plugin (which may use v2 or v3 depending on version), this plugin specifically targets UglifyJS v3 and is a lightweight alternative.

devops

npm install uglifyjs-3-webpack-plugin

github ↗package ↗

INSTALL

IMPORT

SIG · UGLIFYJS-3-WEBPACK

uglifyjs-3-webpack-plugin

devopsjavascriptv1.2.4

Install

—

Import

—

Disk

—

Pass rate

0/ 6

Env Coverage0 / 6

glibc

18–22

musl

18–22

Install & Compatibility

Where this runs

tested against v? · npm install

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

node 18–226 runs

build_error

glibc

node 18–226 runs

build_error

Code

Verified usage

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

default

✓ const UglifyJsPlugin = require('uglifyjs-3-webpack-plugin');

✗ import UglifyJsPlugin from 'uglifyjs-3-webpack-plugin';

This package does not export ESM; use CommonJS require.

UglifyJsPlugin

✓ const UglifyJsPlugin = require('uglifyjs-3-webpack-plugin');

✗ const { UglifyJsPlugin } = require('uglifyjs-3-webpack-plugin');

Default export, not named export. Destructuring will result in undefined.

webpack.config.js usage

✓ plugins: [new UglifyJsPlugin({ sourceMap: true })]

✗ optimization: { minimizer: [new UglifyJsPlugin()] }

For webpack 4, you should use the optimization.minimizer config, not plugins. However, this plugin's docs show plugins array; for webpack 4, prefer the minizer approach with optimization.minimize: true.

Configures the UglifyJS webpack plugin to minify output, drop console.log statements, remove comments, enable source maps, and run in parallel.

const UglifyJsPlugin = require('uglifyjs-3-webpack-plugin'); module.exports = { entry: './src/index.js', output: { filename: 'bundle.js' }, plugins: [ new UglifyJsPlugin({ uglifyOptions: { compress: { drop_console: true }, output: { comments: false } }, sourceMap: true, parallel: true }) ] };

Debug

Known issues

deprecatedThis package is deprecated; use terser-webpack-plugin instead for webpack 4+.

fix

Replace with terser-webpack-plugin: npm i -D terser-webpack-plugin and import TerserPlugin from 'terser-webpack-plugin'.

affects: *

breakingNot compatible with webpack 5; only supports webpack 2, 3, and 4.

fix

Use terser-webpack-plugin for webpack 5 projects.

affects: >=1.0.0

gotchacheap-source-map devtool options do not work with this plugin; use other source map strategies.

fix

Avoid 'cheap-source-map', 'cheap-module-source-map', etc. Use 'source-map' or 'eval-source-map' instead.

affects: *

gotchaDefault export; destructuring require will result in undefined.

fix

Use const UglifyJsPlugin = require('uglifyjs-3-webpack-plugin'); not const { UglifyJsPlugin } = require(...).

affects: *

brokenUglifyJS v3 may fail on ES6+ syntax if not transpiled by Babel prior to minification.

fix

Ensure Babel (or similar) transpiles ES6+ to ES5 before this plugin runs; set webpack module rules accordingly.

affects: *

Errors

Common errors & fixes

Error: Cannot find module 'uglifyjs-3-webpack-plugin'

Package not installed or missing from node_modules.

fix

Run 'npm install uglifyjs-3-webpack-plugin --save-dev' to install.

TypeError: UglifyJsPlugin is not a constructor

Importing the package incorrectly by destructuring the default export.

fix

Use 'const UglifyJsPlugin = require("uglifyjs-3-webpack-plugin");' without curly braces.

Error: webpack.optimize.UglifyJsPlugin is not a constructor

Confusion with webpack built-in plugin (webpack 3 and below) vs this plugin.

fix

This plugin is used as 'new UglifyJsPlugin(...)' from package, not from webpack.optimize.

ValidationError: Invalid options object. UglifyJs Plugin has been initialized using an options object that does not match the API schema.

Passing unsupported options, e.g., 'compress: {}' without proper format.

fix

Review uglifyOptions structure; for compress use object like { compress: { drop_console: true } }.

Upgrade

Version history

1.2.4latest on npm

Audit

Dependencies

uglify-jsrequiredUglifyJS v3 is the core minifier engine; plugin depends on at least version 3.0.0.

webpackrequiredPeer dependency on webpack ^2.0.0 || ^3.0.0 || ^4.0.0; not suitable for webpack 5.

Agent activity

6 hits · last 30 days

node

Resources

githubhttps://github.com/whtsky/uglifyjs-3-webpack-plugin ↗

packagehttps://www.npmjs.com/package/uglifyjs-3-webpack-plugin ↗