webpack-bundle-tracker

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

This is the fork of webpack-bundle-tracker (https://github.com/owais/webpack-bundle-tracker) with added functionality for async chunks.

There are two types of chunks, named e.g: main, app, vendors and with id - service chunks

Named chunks needs to be preload an service chunks needs to be prefeched.

I use this plugin in combination with django-webpack-loader (https://github.com/owais/django-webpack-loader)

Install

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

Usage

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

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

    plugins: [
      new BundleTracker({
        path: __dirname,
        filename: './assets/webpack-stats.json',
        preload: 'async_preload', // for preloading named chunks
        prefetch: 'async_prefetch', // for prefetching service chunks
      })
    ]
}

./assets/webpack-stats.json will look like,

{
  "status": "done",
  "chunks": {
    "app": [
      {
        "name": "app-0828904584990b611fb8.js",
        "publicPath": "http://localhost:3000/assets/bundles/app-0828904584990b611fb8.js",
        "path": "/home/user/project-root/assets/bundles/app-0828904584990b611fb8.js"
      }
    ],
    "runtime": [
      {
        "name": "runtime-58e2b6c82f0f9e50524c.js",
        "publicPath": "http://localhost:3000/assets/bundles/runtime-58e2b6c82f0f9e50524c.js",
        "path": "/home/user/project-root/assets/bundles/runtime-58e2b6c82f0f9e50524c.js"
      }
    ]
  },
  "entryPoints": {
    "main": [
      [
        {
        "name": "app-0828904584990b611fb8.js",
        "publicPath": "http://localhost:3000/assets/bundles/app-0828904584990b611fb8.js",
        "path": "/home/user/project-root/assets/bundles/app-0828904584990b611fb8.js"
        }
      ],
      [
        {
        "name": "runtime-58e2b6c82f0f9e50524c.js",
        "publicPath": "http://localhost:3000/assets/bundles/runtime-58e2b6c82f0f9e50524c.js",
        "path": "/home/user/project-root/assets/bundles/runtime-58e2b6c82f0f9e50524c.js"
        }
      ]
    ]
  }
}

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

{
  "status":"compiling",
}

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":[{
      "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
}

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: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify

Bundle Tracker Options

• filename - Name of the bundle tracker JSON file.
• logTime - Optional boolean property to output startTime and endTime in bundle tracker file.
• path - Optional bundle tracker output path.
• publicPath - Optional property to override output.publicPath.
• preload - name of key for chunks to preload (named chunks)
• prefetch - name of key for chunks to prefetch (service chunks)