webpack-uglify-js-plugin

1.1.9 verified Sat Apr 25 auth: no javascript deprecated

An incremental UglifyJS plugin for webpack, version 1.1.9. Designed to cache minification results to speed up builds, it applies UglifyJS only to changed modules. Provides options for caching, source maps, compressor settings, and output configuration. No active releases since 2016; consider using webpack's built-in terser-webpack-plugin instead, which is actively maintained and supports modern JavaScript.

Common errors

error Error: Cannot find module 'uglify-js' ↓

cause Missing peer dependency uglify-js

fix

npm install uglify-js --save-dev

error TypeError: webpackUglifyJsPlugin is not a constructor ↓

cause Incorrect import, e.g., using ES6 default import without proper interop

fix

Use require('webpack-uglify-js-plugin') directly.

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

cause Mixing options from terser-webpack-plugin or webpack's built-in plugin

fix

Refer to the plugin's documentation for allowed options.

Warnings

deprecated Package is unmaintained since 2016; use terser-webpack-plugin instead. ↓

fix Replace with terser-webpack-plugin: npm install terser-webpack-plugin --save-dev

gotcha Requires uglify-js as a peer dependency; not automatically installed. ↓

fix Run: npm install uglify-js --save-dev

breaking Options structure may conflict with webpack's built-in UglifyJsPlugin; use only this plugin's options. ↓

fix Remove any webpack.optimize.UglifyJsPlugin configuration.

Install

npm install webpack-uglify-js-plugin

yarn add webpack-uglify-js-plugin

pnpm add webpack-uglify-js-plugin

Imports

default

wrong

import webpackUglifyJsPlugin from 'webpack-uglify-js-plugin';

correct

var webpackUglifyJsPlugin = require('webpack-uglify-js-plugin');

Package uses CommonJS; no default export for ES6 imports.

default
```
import webpackUglifyJsPlugin = require('webpack-uglify-js-plugin');
```
TypeScript with esModuleInterop: import * as webpackUglifyJsPlugin from 'webpack-uglify-js-plugin';

default

wrong

const { webpackUglifyJsPlugin } = require('webpack-uglify-js-plugin');

correct

const webpackUglifyJsPlugin = require('webpack-uglify-js-plugin');

Export is a single function, not an object.

Quickstart

Configures webpack to use UglifyJS plugin with caching enabled, source maps off, and comments removed.

var path = require('path');
var webpackUglifyJsPlugin = require('webpack-uglify-js-plugin');

module.exports = {
  plugins: [
    new webpackUglifyJsPlugin({
      cacheFolder: path.resolve(__dirname, 'cached_uglify/'),
      debug: false,
      minimize: true,
      sourceMap: false,
      output: {
        comments: false
      },
      compressor: {
        warnings: false
      }
    })
  ]
};