kishorevarma / webpack-bundle-analyzer

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

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.

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({
  // Start analyzer HTTP-server.
  // You can use this plugin to just generate Webpack Stats JSON file by setting `startAnalyzer` to `false`
  // and `generateStatsFile` to `true`.
  startAnalyzer: true,
  // Analyzer HTTP-server port
  analyzerPort: 8888,
  // Automatically open analyzer page in default browser if `startAnalyzer` is `true`
  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',
})

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.

License

MIT