GitHub Actions Bundle size comparison

bundle-size.yaml

name: 'Bundle Size Comparison'

on:
  pull_request:
    branches:
      - master

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout master branch
        uses: actions/checkout@v2
        with:
          ref: master

      - name: Use Node.js
        uses: actions/setup-node@v2
        with:
          node-version: 18

      - name: Install dependencies
        run: npm i

      - name: Build the code
        run: npm run build

      - name: Get master branch bundle sizes
        id: master_sizes
        run: |
          echo "client_size=$(du -sk ./build/client/_app/immutable | cut -f1)" >> $GITHUB_ENV
          echo "server_size=$(du -sk ./build/server | cut -f1)" >> $GITHUB_ENV

      - name: Clean up
        run: rm -Rf node_modules/ build/

      - name: Checkout PR branch
        uses: actions/checkout@v2

      - name: Install dependencies
        run: npm i

      - name: Build the code
        run: npm run build

      - name: Get PR branch bundle sizes
        id: pr_sizes
        run: |
          echo "pr_client_size=$(du -sk ./build/client/_app/immutable | cut -f1)" >> $GITHUB_ENV
          echo "pr_server_size=$(du -sk ./build/server | cut -f1)" >> $GITHUB_ENV

      - name: Compute size differences
        id: size_diffs
        run: |
          echo "client_diff=$((${{ env.pr_client_size }} - ${{ env.client_size }}))" >> $GITHUB_ENV
          echo "server_diff=$((${{ env.pr_server_size }} - ${{ env.server_size }}))" >> $GITHUB_ENV

      - name: Comment PR
        uses: mshick/add-pr-comment@v2
        with:
          message-id: 'bundle-size-comparison'
          message: |
            📦 Master Branch Client Size: ${{ env.client_size }} KB
            🚀 PR Branch Client Size: ${{ env.pr_client_size }} KB
            Δ Client Size Difference: ${{ env.client_diff }} KB

            🖥️ Master Branch Server Size: ${{ env.server_size }} KB
            🚀 PR Branch Server Size: ${{ env.pr_server_size }} KB
            Δ Server Size Difference: ${{ env.server_diff }} KB
          repo-token: '${{ github.token }}'