size.yml

name: Bundle Size Check

on:
  pull_request:
    branches: [main]

jobs:
  size:
    name: Check Bundle Size
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20.x'
          cache: 'npm'

      - name: Install dependencies
        run: npm ci

      - name: Build library
        run: npm run build

      - name: Check bundle size
        run: |
          echo "## Bundle Size Report" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "| File | Size | Gzipped |" >> $GITHUB_STEP_SUMMARY
          echo "|------|------|---------|" >> $GITHUB_STEP_SUMMARY

          for file in dist/*.js dist/*.cjs; do
            if [ -f "$file" ]; then
              name=$(basename "$file")
              size=$(wc -c < "$file" | awk '{printf "%.2f KB", $1/1024}')
              gzip_size=$(gzip -c "$file" | wc -c | awk '{printf "%.2f KB", $1/1024}')
              echo "| $name | $size | $gzip_size |" >> $GITHUB_STEP_SUMMARY
            fi
          done

          echo "" >> $GITHUB_STEP_SUMMARY
          echo "### Size Limits" >> $GITHUB_STEP_SUMMARY
          echo "- ✅ ESM bundle should be < 50KB (gzipped < 15KB)" >> $GITHUB_STEP_SUMMARY
          echo "- ✅ CJS bundle should be < 50KB (gzipped < 15KB)" >> $GITHUB_STEP_SUMMARY

          # Check if any file is too large (50KB uncompressed)
          for file in dist/index.js dist/index.cjs; do
            if [ -f "$file" ]; then
              size=$(wc -c < "$file")
              if [ $size -gt 51200 ]; then
                name=$(basename "$file")
                echo "::error::$name is too large: $(($size / 1024)) KB (max 50 KB)"
                exit 1
              fi
            fi
          done

      - name: Comment PR
        uses: actions/github-script@v7
        if: github.event_name == 'pull_request'
        with:
          script: |
            const fs = require('fs');
            const files = ['dist/index.js', 'dist/index.cjs'];

            let comment = '## 📦 Bundle Size Report\n\n';
            comment += '| File | Size | Gzipped |\n';
            comment += '|------|------|---------|\\n';

            for (const file of files) {
              if (fs.existsSync(file)) {
                const stats = fs.statSync(file);
                const sizeKB = (stats.size / 1024).toFixed(2);
                const { execSync } = require('child_process');
                const gzipSize = execSync(`gzip -c ${file} | wc -c`).toString().trim();
                const gzipKB = (parseInt(gzipSize) / 1024).toFixed(2);
                const name = file.split('/').pop();
                comment += `| ${name} | ${sizeKB} KB | ${gzipKB} KB |\\n`;
              }
            }

            comment += '\n✅ All bundles are within size limits!';

            github.rest.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: comment
            });