Rollup Plugin Visualizer

Visualize and analyze your Rollup bundle to see which modules are taking up space.

Screenshots

Installation

npm install --save-dev rollup-plugin-visualizer

or via yarn:

yarn add --dev rollup-plugin-visualizer

Usage

Import

// es
import { visualizer } from "rollup-plugin-visualizer";
// or
// cjs
const { visualizer } = require("rollup-plugin-visualizer");

Usage with rollup (rollup.config.js)

module.exports = {
  plugins: [
    // put it the last one
    visualizer(),
  ],
};

Usage with vite (vite.config.js)

module.exports = {
  plugins: [visualizer()],
};

Usage with SvelteKit (vite.config.js)

const config = {
  plugins: [
    visualizer({
      emitFile: true,
      file: 'stats.html'
    })
  ],
};

export default config;

You will find 2/3 files in .svelte-kit/output dir named stats.html (see vite logs for file locations) . You can use this snippet as a starting point and change props/path. You can also generate 3 json files and combine them to one with cli util.

How to use generated files

Blue color used to to mark project-own files. This could be: written by you files or generated by build tool files.

Green color used to mark your dependencies.

Internally it just checks if file id prefix is node_modules.

All charts refresh layout on window resize.

Sunburst

This circular hierarchical diagram can help you find huge peaces of code (aka that one huge thing). If you click on some arc it will increase its and all nested arcs size for better inspection.

Treemap

This rectangular hierarchical diagram can help you find huge peaces. Just look on biggest reclangle. But also it can help you find modules included several times, they will have the same topology and relative size. If you click on reclangle it will increase in size for further inspection.

Network

This digram should help you answer for the question 'why it is included?'. After force layout stabilize all nodes, you can move it back and forth by dragging with your mouse. Gray circles are treeshakened out files.

In real life scenarious, sometimes you will see terribly connected diagrams. There is no 100% working solution for everyone, it is expected you topology will look 'terrible' and not hold on screen. To make it still visually ispectable, first remove all highly connected nodes that you see (typical examples: commonjsHelpers, tslib, react etc, basically if tooltip for the node is not hold on the screen - exclude this node), after layout stabilization you will see, your layout is not that terrible anymore and most of dependencies cluster together. Move layout to find peaces you looked for.

When you click on node it will hightlight nodes that are listed in tooltip (the files that imports current node).

Options

filename (string, default stats.html) - name of the file with diagram to generate

title (string, default Rollup Visualizer) - title tag value

sourcemap (boolean, default false) - Use sourcemaps to calculate sizes (e.g. after UglifyJs or Terser). Always add plugin as last option.

open (boolean, default false) - Open generated file in default user agent

emitFile (boolean, default false) - Use rollup's emitFile to generate file

template (string, default treemap) - Which diagram type to use: sunburst, treemap, network.

json (boolean, default false) - Produce portable json file that can be used with plugin CLI util to generate graph from several json files. Every UI property ignored in this case.

gzipSize (boolean, default false) - Collect gzip size from source code and display it at chart.

brotliSize (boolean, default false) - Collect brotli size from source code and display it at chart.

projectRoot (string | RegExp, default process.cwd()) - This is some common root(s) path to your files. This is used to cut absolute files paths out.

CLI

This plugin provides cli util rollup-plugin-visualizer. Add --help to check actual options. It can be used like:

rollup-plugin-visualizer [OPTIONS] stat1.json stat2.json ../stat3.json

This can be usefull in case you have different config files in the same project and you want to display all of them in the same chart.

Build plugin

For development if you need to build plugin, just exec:

npm run build

Disclaimer about generated files

Generated html files do not and never will contain your source code (contents of files). They can contain only js/html/css code required to build chart (plugin code) and statistical information about your source code.

This statistical information can contain:

• size of files included in bundle
• size of files included in source map
• file's paths
• files hierarchy (fs tree for your files)

Upgrades

See CHANGELOG.md.