v10/.github/workflows/bundle-size.yml

name: Bundle Size

on:
  pull_request:
    branches:
      - main

permissions:
  pull-requests: write

jobs:
  pr-size:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout PR
        uses: actions/checkout@v5

      - name: Setup pnpm
        uses: pnpm/action-setup@v4

      - name: Setup Node.js
        uses: actions/setup-node@v5
        with:
          node-version: 22
          cache: pnpm

      - name: Cache turbo build setup
        uses: actions/cache@v5
        with:
          path: .turbo
          key: ${{ runner.os }}-turbo-pr-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-turbo-pr-

      - name: Install and build
        run: pnpm install && pnpm build:packages

      - name: Measure bundle size
        run: node .github/scripts/bundle-size.js --json pr-size.json

      - name: Upload size data
        uses: actions/upload-artifact@v4
        with:
          name: pr-size
          path: pr-size.json

  base-size:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout base
        uses: actions/checkout@v5
        with:
          ref: ${{ github.base_ref }}

      - name: Checkout PR scripts
        uses: actions/checkout@v5
        with:
          repository: ${{ github.event.pull_request.head.repo.full_name }}
          ref: ${{ github.event.pull_request.head.sha }}
          path: .bundle-size-pr

      - name: Setup pnpm
        uses: pnpm/action-setup@v4

      - name: Setup Node.js
        uses: actions/setup-node@v5
        with:
          node-version: 22
          cache: pnpm

      - name: Cache turbo build setup
        uses: actions/cache@v5
        with:
          path: .turbo
          key: ${{ runner.os }}-turbo-base-${{ github.event.pull_request.base.sha }}
          restore-keys: |
            ${{ runner.os }}-turbo-base-

      - name: Install and build
        run: |
          pnpm install

          if [ -f .bundle-size-pr/.github/scripts/bundle-size.js ]; then
            pnpm build:packages
            node .bundle-size-pr/.github/scripts/bundle-size.js --root . --json base-size.json
          else
            echo '[]' > base-size.json
          fi

      - name: Upload size data
        uses: actions/upload-artifact@v4
        with:
          name: base-size
          path: base-size.json

  report:
    runs-on: ubuntu-latest
    needs: [pr-size, base-size]

    steps:
      - name: Checkout code
        uses: actions/checkout@v5

      - name: Download size data
        uses: actions/download-artifact@v4
        with:
          path: artifacts

      - name: Generate report
        run: >
          node .github/scripts/bundle-size-report.js
          --pr artifacts/pr-size/pr-size.json
          --base artifacts/base-size/base-size.json
          > report.md

      - name: Post comment
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            const body = fs.readFileSync('report.md', 'utf8');
            const marker = '<!-- bundle-size-report -->';

            const { data: comments } = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
            });

            const existing = comments.find(c => c.body?.startsWith(marker));

            if (existing) {
              await github.rest.issues.updateComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                comment_id: existing.id,
                body,
              });
            } else {
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.issue.number,
                body,
              });
            }