From 26d9b194bca137fc3c2b3992b67ff9eb353c4ea5 Mon Sep 17 00:00:00 2001
From: Tim Hostetler <6970899+thostetler@users.noreply.github.com>
Date: Fri, 2 Feb 2024 16:54:22 -0500
Subject: [PATCH] add nextjs bundle analysis github action

---
 .github/workflows/nextjs_bundle_analysis.yml | 131 +++++++++++++++++++
 package.json                                 |  10 +-
 2 files changed, 139 insertions(+), 2 deletions(-)
 create mode 100644 .github/workflows/nextjs_bundle_analysis.yml

diff --git a/.github/workflows/nextjs_bundle_analysis.yml b/.github/workflows/nextjs_bundle_analysis.yml
new file mode 100644
index 000000000..9e1773794
--- /dev/null
+++ b/.github/workflows/nextjs_bundle_analysis.yml
@@ -0,0 +1,131 @@
+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: MPL-2.0
+
+name: 'Next.js Bundle Analysis'
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master # change this if your default branch is named differently
+  workflow_dispatch:
+
+defaults:
+  run:
+    # change this if your nextjs app does not live at the root of the repo
+    working-directory: ./
+
+permissions:
+  contents: read # for checkout repository
+  actions: read # for fetching base branch bundle stats
+  pull-requests: write # for comments
+
+jobs:
+  analyze:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+          node-version: [18]
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: pnpm/action-setup@v2
+        name: Install pnpm
+        id: pnpm-install
+        with:
+          version: 8
+          run_install: false
+
+      - uses: actions/cache@v3
+        name: restore/setup pnpm cache
+        with:
+          path: ~/.pnpm-store
+          key: ${{ runner.os }}-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
+
+      - name: Install dependencies
+        if: steps.pnpm-cache.outputs.cache-hit != 'true'
+        run: pnpm install
+
+      - name: Lint
+        run: pnpm lint
+
+      - name: Restore next build
+        uses: actions/cache@v3
+        id: restore-build-cache
+        env:
+          cache-name: cache-next-build
+        with:
+          path: dev/cache
+          key: ${{ runner.os }}-build-${{ env.cache-name }}
+
+      - name: Build
+        run: pnpm analyze
+
+      # 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: Analyze bundle
+        run: pnpm --package=nextjs-bundle-analysis dlx report
+
+      - name: Upload bundle
+        uses: actions/upload-artifact@v3
+        with:
+          name: bundle
+          path: dev/analyze/__bundle_analysis.json
+
+      - name: Download base branch bundle stats
+        uses: dawidd6/action-download-artifact@v2
+        if: success() && github.event.number
+        with:
+          workflow: nextjs_bundle_analysis.yml
+          branch: ${{ github.event.pull_request.base.ref }}
+          path: dev/analyze/base
+
+      # And here's the second place - this runs after we have both the current and
+      # base branch bundle stats, and will compare them to determine what changed.
+      # There are two configurable arguments that come from package.json:
+      #
+      # - budget: optional, set a budget (bytes) against which size changes are measured
+      #           it's set to 350kb here by default, as informed by the following piece:
+      #           https://infrequently.org/2021/03/the-performance-inequality-gap/
+      #
+      # - red-status-percentage: sets the percent size increase where you get a red
+      #                          status indicator, defaults to 20%
+      #
+      # Either of these arguments can be changed or removed by editing the `nextBundleAnalysis`
+      # entry in your package.json file.
+      - name: Compare with base branch bundle
+        if: success() && github.event.number
+        run: ls -laR dev/analyze/base && pnpm --package=nextjs-bundle-analysis dlx compare
+
+      - name: Get Comment Body
+        id: get-comment-body
+        if: success() && github.event.number
+        # https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#multiline-strings
+        run: |
+          echo "body<<EOF" >> $GITHUB_OUTPUT
+          echo "$(cat dev/analyze/__bundle_analysis_comment.txt)" >> $GITHUB_OUTPUT
+          echo EOF >> $GITHUB_OUTPUT
+
+      - 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@v2
+        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@v2
+        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
diff --git a/package.json b/package.json
index 606d5f0f8..480b88507 100644
--- a/package.json
+++ b/package.json
@@ -192,5 +192,11 @@
   "browserslist": [
     ">0.3%",
     "not dead"
-  ]
-}
+  ],
+  "nextBundleAnalysis": {
+    "budget": null,
+    "budgetPercentIncreaseRed": 20,
+    "minimumChangeThreshold": 0,
+    "showDetails": true
+  }
+}
\ No newline at end of file