Webpack Bundle Tracker

Spits out some stats about webpack compilation process to a file.

Install

npm install --save-dev webpack-bundle-tracker

Compatibility

This project is compatible with NodeJS versions 16 and up.

⚠️ Starting on version 17, NodeJS uses OpenSSL v3 which has compatibility issues with Webpack@4. This isn't an issue for Webpack@5, however if you're using Node >= 17 and Webpack@4, to properly use this package you must ensure to set the NODE_OPTIONS=--openssl-legacy-provider environment variable. You can read more about this on webpack/webpack#14532.

Migrating from version 1.x.y to 2.x.y

Starting on version 2.0.0, when creating a new instance of BundleTracker, the usage of the path parameter has been fixed and it's now being used to generate the output path for the stats file, together with the filename parameter. On version 2.0.0, if the path parameter is ommited from the constuctor call, it will attempt to place the stats file at the output.path directory (if also ommited, will use '.' as a fallback). Also, version 2.0.0 doesn't allow sub-directories to be included on the filename, only allowing to include them on the path param. To avoid those issues, when migrating, double-check if the file placement is as expected. The usage of these parameters is documented here and here.

Usage

var path = require('path');
var BundleTracker = require('webpack-bundle-tracker');
module.exports = {
  context: __dirname,
  entry: {
    app: ['./app'],
  },

  output: {
    path: path.resolve('./assets/bundles/'),
    filename: '[name]-[hash].js',
    publicPath: 'http://localhost:3000/assets/bundles/',
  },

  plugins: [
    new BundleTracker({
      path: path.join(__dirname, 'assets'),
      filename: 'webpack-stats.json',
    }),
  ],
};

The webpack-stats.json file will look like,

{
  "status": "done",
  "chunks": {
    "app": ["app-0828904584990b611fb8.js"]
  },
  "assets": {
    "app-0828904584990b611fb8.js": {
      "name": "app-0828904584990b611fb8.js",
      "publicPath": "http://localhost:3000/assets/bundles/app-0828904584990b611fb8.js",
      "path": "/home/user/project-root/assets/bundles/app-0828904584990b611fb8.js"
    }
  }
}

In case webpack is still compiling, it'll look like,

{
  "status": "compile"
}

And errors will look like,

{
  "status": "error",
  "file": "/path/to/file/that/caused/the/error",
  "error": "ErrorName",
  "message": "ErrorMessage"
}

ErrorMessage shows the line and column that caused the error.

And in case logTime option is set to true, the output will look like,

{
  "status": "done",
  "chunks": {
    "app": ["app-0828904584990b611fb8.js"]
  },
  "assets": {
    "app-0828904584990b611fb8.js": {
      "name": "app-0828904584990b611fb8.js",
      "publicPath": "http://localhost:3000/assets/bundles/app-0828904584990b611fb8.js",
      "path": "/home/user/project-root/assets/bundles/app-0828904584990b611fb8.js"
    }
  },
  "startTime": 1440535322138,
  "endTime": 1440535326804
}

And in case relativePath option is set to true, the output will look like,

{
  "status": "done",
  "chunks": {
    "app": ["app-0828904584990b611fb8.js"]
  },
  "assets": {
    "app-0828904584990b611fb8.js": {
      "name": "app-0828904584990b611fb8.js",
      "publicPath": "http://localhost:3000/assets/bundles/app-0828904584990b611fb8.js",
      "path": "app-0828904584990b611fb8.js"
    }
  }
}

And in case integrity option is set to true, the output will look like,

{
  "status": "done",
  "chunks": {
    "app": ["app-0828904584990b611fb8.js"]
  },
  "assets": {
    "app-0828904584990b611fb8.js": {
      "name": "app-0828904584990b611fb8.js",
      "publicPath": "http://localhost:3000/assets/bundles/app-0828904584990b611fb8.js",
      "path": "app-0828904584990b611fb8.js",
      "integrity": "sha256-yAIefNWsF0IfxalAlLNngdY0t3J1h4IzZLzcJEn/FTM= sha384-QmiRCOdQx6MVC721liFMbJjud6Kr5ryT1vhHI5htzftpzoI1P3IlBqbpg5AHjbBv sha512-kbLjakids0Z2vvrOrtV7s2FUvKcgM3bg0WQwuyGvJPE+zVqOL4t0UvWkeUzz5z2ZrDm0ST/dQjPBJaq7rDB/2Q=="
    }
  }
}

And in case of usage of compression plugin for webpack, the output will look like,

{
  "status": "done",
  "chunks": {
    "app": ["app-0828904584990b611fb8.js"]
  },
  "assets": {
    "app-0828904584990b611fb8.js": {
      "name": "app-0828904584990b611fb8.js",
      "publicPath": "http://localhost:3000/assets/bundles/app-0828904584990b611fb8.js",
      "path": "/home/user/project-root/assets/bundles/app-0828904584990b611fb8.js"
    },
    "app-0828904584990b611fb8.js.br": {
      "name": "app-0828904584990b611fb8.js.br",
      "publicPath": "http://localhost:3000/assets/bundles/app-0828904584990b611fb8.js.br",
      "path": "/home/user/project-root/assets/bundles/app-0828904584990b611fb8.js.br"
    },
    "app-0828904584990b611fb8.js.gz": {
      "name": "app-0828904584990b611fb8.js.gz",
      "publicPath": "http://localhost:3000/assets/bundles/app-0828904584990b611fb8.js.gz",
      "path": "/home/user/project-root/assets/bundles/app-0828904584990b611fb8.js.gz"
    }
  }
}

By default, the output JSON will not be indented. To increase readability, you can use the indent option to make the output legible. By default it is off. The value that is set here will be directly passed to the space parameter in JSON.stringify. More information can be found here

Options

Name	Type	Default	Description
path	{String}	'.'	Output directory of bundle tracker JSON file. Will attempt to use output.path before falling back to the default value.
filename	{String}	'webpack-stats.json'	Name of the bundle tracker JSON file.
publicPath	{String}	(ignored)	Override output.publicPath from Webpack config.
relativePath	{Boolean}	false	Show relative path instead of absolute path for bundles in JSON Tracker file. Path are relative from path of JSON Tracker file.
logTime	{Boolean}	false	Output startTime and endTime properties in bundle tracker JSON file.
integrity	{Boolean}	false	Output integrity property for each asset entry.
integrityHashes	{Array}	['sha256', 'sha384', 'sha512']	Cryptographic hash functions used to compute integrity for each asset.
indent	{Integer}	undefined	Format resulting JSON file for better readability.