BundleStats

Analyze webpack stats(bundle size, assets, modules, packages) and compare the results between different builds.

- Bundle size and totals by file type(css, js, img, etc)
- Cache invalidation, Initial JS/CSS and other bundle specific metrics
- Assets report (entrypoint, initial, types, changed, delta)
- Modules report (changed, delta) by chunk
- Packages report (count, duplicate, changed, delta)
:star: Side by side comparison for multiple builds

Table of Contents

• Install
• Webpack configuration
  • BundleStatsWebpackPlugin(options)
  • Use with create-react-app
• Compare mode
• Framework specific plugins
• Related projects

Install

npm install --dev bundle-stats-webpack-plugin

or

yarn add --dev bundle-stats-webpack-plugin

Webpack configuration

// webpack.config.js
const { BundleStatsWebpackPlugin } = require('bundle-stats-webpack-plugin');

module.exports = {
  ...,
  plugins: [
    new BundleStatsWebpackPlugin()
  ]
}

BundleStatsWebpackPlugin(options)

• compare - use local saved stats for comparison (default true).
• baseline - save current webpack stats as baseline (default false).
• html - output html report (default true).
• json - output json report (default false).
• outDir - output directory relative to webpack output.path (default '').
• silent - stop logging info and only log warning and error (default false).
• stats - Webpack stats options default:

  {
    stats: {
      assets: true,
      entrypoints: true,
      chunks: true,
      modules: true,
      builtAt: true,
      hash: true
    }
  }
  

Use with create-react-app

You will need to customize the default webpack config. That can be done by using react-app-rewired which is one of create-react-app's custom config solutions. You will also need customize-cra.

npm install --dev customize-cra react-app-rewired

or

yarn add customize-cra react-app-rewired --dev

Change your default scripts in package.json to:

/* package.json */
"scripts": {
  "start": "react-app-rewired start",
  "build": "react-app-rewired build",
  "test": "react-app-rewired test"
}

Create a file config-overrides.js at the same level as package.json.

// config-overrides.js
const { override, addWebpackPlugin } = require('customize-cra');
const { BundleStatsWebpackPlugin } = require('bundle-stats-webpack-plugin');

module.exports = override(
  addWebpackPlugin(new BundleStatsWebpackPlugin()),
);

Compare mode

In compare mode, the metrics are compared against an existing(node_modules/.cache/bundle-stats/baseline.json) Webpack stats file(baseline). To generate the baseline webpack stats, set BUNDLE_STATS_BASELINE environmental variable to true or set BundleStatsWebpackPlugin baseline option to true:

# Checkout to the branch/tag/commit where you want to generate the baseline
$ git checkout master

# Build your application with BUNDLE_STATS_BASELINE environmental variable
$ BUNDLE_STATS_BASELINE=true npm run build

# Checkout to the working branch/tag/commit
$ git checkout MY_FEATURE_BRANCH

# Build your application
$ npm run build

The option can be disabled by setting BundleStatsWebpackPlugin compare option to false.

Framework specific plugins

• Gatsby
• Next

Related projects

:cyclone: relative-ci.com

Specialized insights for web bundles:

• Analyze and monitor webpack stats(bundle size, assets, modules, packages)
• GitHub Check, GitHub Pull Request, and Slack integrations
• Support for all major CI services (CircleCI, GitHub Actions, Gitlab CI, Jenkins, Travis CI)
• Free for OpenSource, developers and small teams

Try for free

:first_quarter_moon: relative-ci/compare

Standalone web application to compare Webpack/Lighthouse/Browsertime stats.

Compare bundle stats

:zap: bundle-stats-action

Github Action that generates bundle-stats reports for webpack.