Webpack Bundle Analyzer

Webpack plugin and CLI utility that represents bundle content as convenient interactive zoomable treemap

What is this for?

Just take a look at this demo:

This module will help you:

1. Realize what's really inside your bundle
2. Find out what modules make up the most of it's size
3. Find modules that got there by mistake
4. Optimize it!

And the best thing is it supports minified bundles! It parses them to get real size of bundled modules. And it also shows their gzipped sizes!

Installation and usage

There are two ways to use this module:

As plugin

npm install --save-dev webpack-bundle-analyzer

In webpack.config.js:

var BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;

// ...
plugins: [new BundleAnalyzerPlugin()]
// ...

BundleAnalyzerPlugin constructor can take an optional configuration object that defaults to this:

new BundleAnalyzerPlugin({
  // Can be `server`, `static` or `disabled`.
  // In `server` mode analyzer will start HTTP server to show bundle report.
  // In `static` mode single HTML file with bundle report will be generated.
  // In `disabled` mode you can use this plugin to just generate Webpack Stats JSON file by setting `generateStatsFile` to `true`.
  analyzerMode: 'server',
  // Port that will be used in `server` mode to start HTTP server.
  analyzerPort: 8888,
  // Path to bundle report file that will be generated in `static` mode.
  // Relative to bundles output directory.
  reportFilename: 'report.html',
  // Automatically open report in default browser
  openAnalyzer: true,
  // If `true`, Webpack Stats JSON file will be generated in bundles output directory
  generateStatsFile: false,
  // Name of Webpack Stats JSON file that will be generated if `generateStatsFile` is `true`.
  // Relative to bundles output directory.
  statsFilename: 'stats.json',
  // Options for `stats.toJson()` method.
  // For example you can exclude sources of your modules from stats file with `source: false` option.
  // See more options here: https://github.com/webpack/webpack/blob/webpack-1/lib/Stats.js#L21
  statsOptions: null,
  // Log level. Can be 'info', 'warn', 'error' or 'silent'.
  logLevel: 'info'
})

As CLI utility

You can also analyze already existing bundles if you have Webpack Stats JSON file.

You can generate it using BundleAnalyzerPlugin with generateStatsFile option set to true or with this simple command: webpack --profile --json > stats.json

webpack-bundle-analyzer --help will show you all usage information.

Contributing

Check out CONTRIBUTING.md for instructions on contributing 🎉

License

MIT