next-bundle-analysis.yml

name: 'Next.js Bundle Analysis'

on:
  push:
    branches:
      - main
  pull_request:
    branches:
      - main
  workflow_dispatch:

defaults:
  run:
    working-directory: ./

jobs:
  analyze:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Read .nvmrc
        run: echo "NODE_VERSION=$(cat .nvmrc)" >> $GITHUB_ENV

      - name: Use Node.js ${{ env.NODE_VERSION }}
        uses: actions/setup-node@v3
        with:
          node-version: ${{ env.NODE_VERSION }}

      - name: Install Dependencies
        run: npm ci

      - name: Cache Next.js Build
        uses: actions/cache@v3
        id: restore-build-cache
        env:
          cache-name: cache-next-build
        with:
          path: .next/cache
          key: ${{ runner.os }}-build-${{ env.cache-name }}

      - name: Build Next.js Application
        env:
          SKIP_BUILD_PRODUCT_REDIRECTS: 1
        run: npm run build

      - name: Analyze bundle
        run: npx -p nextjs-bundle-analysis report

      - name: Upload Bundle Analysis
        uses: actions/upload-artifact@v3
        with:
          name: bundle
          path: .next/analyze/__bundle_analysis.json

      - name: Download Base Branch Bundle Analysis
        uses: dawidd6/action-download-artifact@v3
        if: success() && github.event.number
        with:
          name: bundle
          workflow: nextjs_bundle_analysis.yml
          branch: ${{ github.event.pull_request.base.ref }}
          path: .next/analyze/base

      - name: Compare with Base Branch Bundle
        if: success() && github.event.number
        run: ls -laR .next/analyze/base && npx -p nextjs-bundle-analysis compare

      - name: Get comment body
        id: get-comment-body
        if: success() && github.event.number
        uses: actions/github-script@v6
        with:
          result-encoding: string
          script: |
            const fs = require('fs')
            const comment = fs.readFileSync('.next/analyze/__bundle_analysis_comment.txt', 'utf8')
            core.setOutput('body', comment)

      - name: Find Comment
        uses: peter-evans/find-comment@v2
        if: success() && github.event.number
        id: fc
        with:
          issue-number: ${{ github.event.number }}
          body-includes: '<!-- __NEXTJS_BUNDLE -->'

      - name: Create Comment
        uses: peter-evans/create-or-update-comment@v3
        if: success() && github.event.number && steps.fc.outputs.comment-id == 0
        with:
          issue-number: ${{ github.event.number }}
          body: ${{ steps.get-comment-body.outputs.body }}

      - name: Update Comment
        uses: peter-evans/create-or-update-comment@v3
        if: success() && github.event.number && steps.fc.outputs.comment-id != 0
        with:
          issue-number: ${{ github.event.number }}
          body: ${{ steps.get-comment-body.outputs.body }}
          comment-id: ${{ steps.fc.outputs.comment-id }}
          edit-mode: replace