bundle-internals

Bundle Internals Plugin

The webpack plugin that collects a debug information about your webpack bundle (e.g. bundled modules, input entry points, and output assets)

Usage

npm i bundle-internals

const BundleInternalsPlugin = require('bundle-internals');

config.plugins.push(new BundleInternalsPlugin());

Options

saveTo: string

Allow to dump a debug data to specified file (relative an output directory)

new BundleInternalsPlugin({
    saveTo: 'debug.json'
});

runMode: string

One of the values:

• all - run plugin on watch and non-watch build
• non-watch - run plugin only on non-watch build
• watch - run plugin only on watch build

runMode is all by default

new BundleInternalsPlugin({
    runMode: 'watch'
});

resolve: boolean

Resolves payload before pass it to the data-hook

new BundleInternalsPlugin({
    resolve: true
});

resolve is false by default

Don't mix resolve and saveTo options because resolve makes a recursive JSON that can't be stringified If you really want to save recursive JSON then use some specialized tools (e.g. flatted)

Hooks

data(payload)

const bundleInternalsPlugin = new BundleInternalsPlugin()
bundleInternalsPlugin.hooks.data.tap('my-plugin', payload => {
    console.log(payload);
})

Data format

Data format described in types.d.ts

Data denormalization/resolving

Some data fields contain only ids and need to denormalize/resolve. For example file field in data.input.modules contain the only id of the file and we need to resolve it from data.input.files:

data.input.modules.forEach(module => {
    module.file = data.input.files.find(file => module.file === file.path)
});

Or you can use builtin resolve function:

const BundleInternalsPlugin = require('bundle-internals');

const bundleInternalsPlugin = new BundleInternalsPlugin()
bundleInternalsPlugin.hooks.data.tap('my-plugin', payload => {
    BundleInternalsPlugin.resolve(payload);
    console.log(payload);
});

Or use resolve option:

new BundleInternalsPlugin({
    resolve: true
});

Why not a builtin webpack Stats object?

Its too huge to analyze ;)

Data Analyzing

This plugin will be used in Webpack Runtime Analyzer V2

But for now, you can get the raw bundle internal data and analyze it manually.

It's just a JSON and you may use any tools to analyze and visualize it

For example, you may load it to Jora Sandbox and make some interesting queries to it.

Jora Sandbox is a sandbox for the Jora query engine that allows you to query and aggregate any data from JSON.

For example...

Used node modules

Jora Query:

input.files.nodeModule
  .group(<name>)
  .({name: key, version: value.version.sort()})
  .sort(<name>)

Result:

[
  { name: "@babel/polyfill", version: ["7.4.4"] },
  { name: "@babel/runtime", version: ["7.5.5"] },
  { name: "@firebase/app", version: ["0.1.10"] },
  { name: "@firebase/messaging", version: ["0.1.9"] },
  { name: "@firebase/util", version: ["0.1.10", "0.1.8"] },
  { name: "@sentry/browser", version: ["4.6.6"] },
  // ...
]

The most required modules

Jora Query:

input.modules.sort(reasons.size() desc).id

Result:

[
  "./node_modules/react/index.js",
  "./node_modules/prop-types/index.js",
  "./node_modules/react-redux/lib/index.js",
  "./node_modules/lodash/get.js",
  "./node_modules/@babel/polyfill/node_modules/core-js/modules/  _export.js",
  "./node_modules/react-dom/index.js",
  // ...

Changelog

1.1.4 (12 March 2020)

• fix crash when a chunk was extracted (e.g. when using mini-css-extract-plugin)