nextjs-bundle-analysis.yml

# Copyright (c) HashiCorp, Inc.
# SPDX-License-Identifier: MPL-2.0
#
# Based on https://github.com/hashicorp/nextjs-bundle-analysis/blob/main/template.yml

name: 'Next.js Bundle Analysis'

on:
  pull_request:
    branches-ignore:
      - 'main'
  push:
    branches:
      - 'canary'
  workflow_dispatch:

permissions:
  contents: read # for checkout repository
  actions: read # for fetching base branch bundle stats
  pull-requests: write # for comments

jobs:
  analyze:
    strategy:
      matrix:
        next-dir: [
          'examples/next/faustwp-getting-started',
        ]

    runs-on: ubuntu-22.04
    steps:
      - uses: actions/checkout@v4

      - name: Install Node.js
        uses: actions/setup-node@v4
        with:
          node-version: 18

      - name: Install bundle analyzer dependency globally
        run: npm install -g @next/bundle-analyzer

      - name: Install dependencies
        run: npm ci

      - name: Build packages
        run: npm run build

      - name: Create "faust" cli bin
        run: npm ci

      - name: Create example project .env.local file
        working-directory: ${{ matrix.next-dir }}
        run: |
          cp .env.local.sample .env.local

      - name: Add bundle analyzer to next.config.js
        working-directory: ${{ matrix.next-dir }}
        run: |
          echo "const withBundleAnalyzer = require('@next/bundle-analyzer')({enabled: true});" >> next.config.js
          echo "module.exports = withBundleAnalyzer(module.exports);" >> next.config.js

      - name: Add bundle analyzer config to package.json
        working-directory: ${{ matrix.next-dir }}
        run: |
          npm pkg set nextBundleAnalysis.budget=358400 nextBundleAnalysis.budgetPercentIncreaseRed=20 nextBundleAnalysis.showDetails=true --json

      - name: Restore next build
        uses: actions/cache@v4
        id: restore-build-cache
        env:
          cache-name: cache-next-build
        with:
          # if you use a custom build directory, replace all instances of `.next` in this file with your build directory
          # ex: if your app builds to `dist`, replace `.next` with `dist`
          path: ${{ matrix.next-dir }}/.next/cache
          # change this if you prefer a more strict cache
          key: ${{ runner.os }}-build-${{ env.cache-name }}

      - name: Build Next.js example app
        working-directory: ${{ matrix.next-dir }}
        run: npm run build

      # Here's the first place where next-bundle-analysis' own script is used
      # This step pulls the raw bundle stats for the current bundle
      - name: Create bundle analysis report for this PR
        working-directory: ${{ matrix.next-dir }}
        run: npx -p nextjs-bundle-analysis report

      - name: Upload bundle analysis report for this PR
        uses: actions/upload-artifact@v4
        with:
          name: bundle
          path: ${{ matrix.next-dir }}/.next/analyze/__bundle_analysis.json

      - name: Download bundle analysis report for base branch
        uses: dawidd6/action-download-artifact@v3
        if: success() && github.event.number
        with:
          workflow: nextjs-bundle-analysis.yml
          branch: ${{ github.event.pull_request.base.ref }}
          path: ${{ matrix.next-dir }}/.next/analyze/base

      - name: Compare analysis reports from base branch and PR branch
        if: success() && github.event.number
        working-directory: ${{ matrix.next-dir }}
        run: |
          npx -p nextjs-bundle-analysis compare

      - name: Get Comment Body
        id: get-comment-body
        if: success() && github.event.number
        working-directory: ${{ matrix.next-dir }}
        # https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#multiline-strings
        run: |
          echo "body<<EOF" >> $GITHUB_OUTPUT
          echo "$(cat .next/analyze/__bundle_analysis_comment.txt)" >> $GITHUB_OUTPUT
          echo EOF >> $GITHUB_OUTPUT

      - name: Find Comment
        uses: peter-evans/find-comment@v3
        if: success() && github.event.number
        id: fc
        with:
          issue-number: ${{ github.event.number }}
          body-includes: '<!-- __NEXTJS_BUNDLE_@faustwp/getting-started-example -->'

      - name: Create Comment
        uses: peter-evans/create-or-update-comment@v4
        continue-on-error: true
        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@v4
        continue-on-error: true
        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