BundleMon

BundleMon helps you to monitor your bundle size.

Your goal is to keep your bundle size as small as possible to reduce the amount of time it takes for users to load your website/application. This is particularly important for users on low bandwidth connections.

BundleMon helps you achieve that by constantly monitoring your bundle size on every commit and alerts you on changes.

Features

• Set max size for files, will fail build if exceeded
• Compare files to base branch
• Set max increase allowed in percentage from base branch, will fail build if exceeded
• Supports multiple CI
• Integrates with Github, can post build status & comment with detailed information
• History report - example

Guides

• Step by step guide to set up BundleMon with Github actions
• Step by step guide to set up BundleMon with CodeFresh

Setup

npm install bundlemon --save-dev

# or

yarn add bundlemon --dev

Add bundlemon property to your package.json

"bundlemon": {
  "baseDir": "./build",
  "files": [
    {
      "path": "index.html",
      "maxSize": "2kb",
      "maxPercentIncrease": 5
    },
    {
      "path": "bundle.<hash>.js",
      "maxSize": "10kb"
    },
    {
      "path": "assets/**/*.{png,svg}"
    }
  ]
}

BundleMon config can be placed in other places like: .bundlemonrc, .bundlemonrc.json, bundlemon.config.js exporting a JS object, more forms can be found here

Name	Description	Type	Default
baseDir	Relative/absolute path to the directory	string	process.cwd()
files	Files config	FileConfig[] required	-
groups	Sum all file sizes matching the pattern, rules applies to the sum of the files Groups config	FileConfig[]	-
defaultCompression	Use compression before calculating file size	"none" | "gzip" | "brotli"	"gzip"
reportOutput	Output options	(string | [string, object])[]	[]
verbose	Print more details	boolean	false
subProject	By setting sub project you can use the same project id for multiple projects. This can be useful for monorepos. Can be set/overwrite with BUNDLEMON_SUB_PROJECT env var	string	undefined

CLI usage

You can also set some of the variables using CLI flags

bundlemon --config my-custom-config-path.json

CLI flags docs

Create new project

In order to save history and get differences from your main branches you will need to create a new project and setup environment variables.

• Create new project and copy the project ID and API key
• Add the ID to BUNDLEMON_PROJECT_ID and the API key to BUNDLEMON_PROJECT_APIKEY environment variables in your CI

Set additional environment variables

In order to get BundleMon to work you'll need to set these environment variables:

If you are using one of the supported CIs (GitHub Actions, Travis, CircleCI and Codefresh) you dont need to set anything.

• CI=true
• CI_REPO_OWNER - github.com/LironEr/bundlemon LironEr
• CI_REPO_NAME - github.com/LironEr/bundlemon bundlemon
• CI_BRANCH - source branch name
• CI_COMMIT_SHA - commit SHA
• CI_TARGET_BRANCH - target branch name, only set if BundleMon runs on a pull request
• CI_PR_NUMBER - PR number, only set if BundleMon runs on a pull request

Using hash in file names?

When using hash in file names the file name can be changed every build.

In order for BundleMon to keep track of your files you can use <hash> to replace the hash with a constant string.

For example:

index.html
home.b72f15a3.chunk.js
login.057c430b.chunk.js
bundle.ea45e578.js

Config:

"bundlemon": {
  "baseDir": "./build",
  "files": [
    {
      "path": "*.<hash>.chunk.js"
    },
    {
      "path": "*.<hash>.js"
    }
  ]
}

Output:

[PASS] bundle.(hash).js: 19.67KB
[FAIL] home.(hash).chunk.js: 70.09KB > 50KB
[PASS] login.(hash).chunk.js: 3.37KB < 50KB

GitHub integration

BundleMon can create GitHub check run, post commit status and a detailed comment on your PR.

Just Install BundleMon GitHub App

Then add github to reportOutput

"reportOutput": ["github"]

// override default options

"reportOutput": [
  [
    "github",
    {
      "checkRun": false,
      "commitStatus": true,
      "prComment": true
    }
  ]
]

GitHub action example & forks support

BundleMon supports running on PRs originating from forks, ONLY on public repos and by removing BUNDLEMON_PROJECT_APIKEY variable.

Step by step guide to set up BundleMon with Github actions

name: Build

on:
  push:
    branches: [main]
  pull_request:
    types: [synchronize, opened, reopened]

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - name: Use Node.js 12
        uses: actions/setup-node@v2-beta
        with:
          node-version: '12'

      - name: Install dependencies
        run: yarn

      - name: Build
        run: yarn build

      - name: Run BundleMon
        run: yarn bundlemon
        env:
          BUNDLEMON_PROJECT_ID: YOUR_PROJECT_ID
          BUNDLEMON_PROJECT_APIKEY: ${{ secrets.BUNDLEMON_PROJECT_APIKEY }} # not required for public repos
          CI_COMMIT_SHA: ${{github.event.pull_request.head.sha || github.sha}} # important!

Make sure to set CI_COMMIT_SHA env var, more info can be found here

Contributing

Read the contributing guide to learn how to run this project locally and contribute.

Credits

• Inspired by BundleWatch