rollup-plugin-bundle-stats

Demos: Bundle analysis comparison · Bundle analysis

BundleStats Rollup/Vite/Rolldown plugin

Analyze Rollup/Vite/Rolldown bundle stats(bundle size, assets, modules, packages) and compare the results between different builds.

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

Table of Contents

• Install
• Configure
• Compare mode
• Other packages
• Related projects

Install

npm install --dev rollup-plugin-bundle-stats

or

yarn add --dev rollup-plugin-bundle-stats

Configure

Vite

// vite.config.js
const { bundleStats } = require('rollup-plugin-bundle-stats');

module.exports = {
  ...,
  build: {
    rollupOptions: {
      output: {
        assetFileNames: 'assets/[name].[hash][extname]',
        chunkFileNames: 'assets/[name].[hash].js',
        entryFileNames: 'assets/[name].[hash].js',
      },
    },
  },
  plugins: [
    bundleStats()
  ]
};

Rollup

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

module.exports = {
  ...,
  output: {
    assetFileNames: 'assets/[name].[hash][extname]',
    chunkFileNames: 'assets/[name].[hash].js',
    entryFileNames: 'assets/[name].[hash].js',
  },
  plugins: [
    bundleStats()
  ]
};

Rolldown

// rolldown.config.js
import { defineConfig } from 'rolldown';
import { bundleStats } from 'rollup-plugin-bundle-stats';

export default defineConfig({
  ...,
  output: {
    assetFileNames: 'assets/[name].[hash][extname]',
    chunkFileNames: 'assets/[name].[hash].js',
    entryFileNames: 'assets/[name].[hash].js',
  },
  plugins: [
    bundleStats()
  ]
});

How to configure Vite for better debugging and monitoring

Options

• compare - use local saved stats for comparison (default true).
• baseline - save current webpack stats as baseline (default false).
• baselineFilepath - baseline absolute filepath or relative filepath to output.dir (default 'node_modules/.cache/bundle-stats/baseline.json')
• html - output html report (default true).
• json - output json report (default false).
• outDir - output directory inside rollup output director output.dir (default '').
• silent - stop logging info and only log warning and error (default false).

Compare mode

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

Other packages

bundle-stats

CLI to generate bundle stats report.

bundle-stats-webpack-plugin

Webpack plugin to generate bundle stats report for webpack/rspack.

gatsby-plugin-bundle-stats

Gatsby plugin for bundle-stats.

next-plugin-bundle-stats

Next.js plugin for bundle-stats.

Related projects

relative-ci.com

Automated bundle analysis, reviews and monitoring - Quickly identify and fix bundle regressions before shipping to production.

• In-depth bundle stats analysis for every build
• Monitor bundle stats changes and identify opportunities for optimizations
• Quick feedback with rule based automated review flow, GitHub Pull Request comments, GitHub check reports, or Slack messages
• Support for webpack, vite, rspack, rollup, rolldown
• Support for all major CI services(CircleCI, GitHub Actions, Gitlab CI, Jenkins, Travis CI)
• Support for npm, yarn and pnpm; support for monorepos
• Always free for Open Source

Get started

relative-ci/compare

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

Compare bundle stats

bundle-stats-action

Github Action that generates bundle-stats reports.