ci: check change in size of node_modules/

.github/workflows/check-node-modules-size.yml

@@ -26,24 +26,77 @@ jobs:
           node-version: 18
 
       - name: Install dependencies
-        run: yarn install
+        run: npm install
 
-      - name: Get main branch node_modules size
-        id: main_size
-        run: echo "::set-output name=size::$(du -sh node_modules | awk '{print $1}')"
+      - name: Analyze `node_modules` size
+        id: current_size
+        run: echo "CURRENT_SIZE=$(du -sh node_modules | awk '{print $1}')" >> $GITHUB_ENV
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Analyze node_modules size
-        id: current_size
-        run: echo "::set-output name=size::$(du -sh node_modules | awk '{print $1}')"
+      # Checkout the main branch and get the size of its `node_modules` directory.
+      - name: Checkout main branch
+        uses: actions/checkout@v2
+        with:
+          ref: main
+      - name: Remove `node_modules` for a clean slate on the main branch.
+        run: rm -rf node_modules/
+      - name: Reinstall dependencies on the main branch so we can check the size of `node_modules`.
+        run: npm install
+      - name: Get the size of `node_modules` on the main branch.
+        id: main_size
+        run: echo "MAIN_SIZE=$(du -sh node_modules | awk '{print $1}')" >> $GITHUB_ENV
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Print sizes
+        run: |
+          echo "Main branch size: $MAIN_SIZE"
+          echo "Current branch size: $CURRENT_SIZE"
+
+      - name: Get pull request number
+        id: get_pr_number
+        run: |
+          echo "$(node --eval 'console.log(process.env.GITHUB_EVENT_PATH)')"
+          echo "$(node --eval 'console.log(process.env.GITHUB_EVENT_PATH)')" >> $GITHUB_ENV
+
       - name: Compare sizes and send alert
-        if: ${{ steps.current_size.outputs.size != steps.main_size.outputs.size }}
+        if: ${{ env.CURRENT_SIZE != env.MAIN_SIZE }}
         run: |
           echo "Node Modules size has changed!"
-          echo "Main branch size: ${{ steps.main_size.outputs.size }}"
-          echo "Current branch size: ${{ steps.current_size.outputs.size }}"
+          echo "Main branch size: $MAIN_SIZE"
+          echo "Current branch size: $CURRENT_SIZE"
           # Add your alerting mechanism here, such as sending a Slack notification, creating an issue, etc.
+
+      # We have to checkout the current branch again because listing pull requests associated with a commit
+      # will fail otherwise.
+      # This block prevents the following error:
+      # TypeError: Cannot read properties of undefined (reading 'number')
+      - name: Checkout current branch
+        uses: actions/checkout@v2
+        with:
+          ref: ${{ github.head_ref }}
+
+      - name: Create comment with output
+        if: ${{ env.CURRENT_SIZE != env.MAIN_SIZE }}
+        uses: actions/github-script@v6
+        with:
+          script: |
+            const body = `\`node_modules/\` size has changed!\n
+            Main branch size: ${process.env.MAIN_SIZE}\n
+            Current branch size: ${process.env.CURRENT_SIZE}`
+
+            const issue_number = process.env.PR_NUMBER;
+            console.log('issue_number:', issue_number);
+            console.log('data is', (await github.rest.repos.listPullRequestsAssociatedWithCommit({
+              commit_sha: context.sha,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+            })).data);
+            // https://stackoverflow.com/questions/58066966/commenting-a-pull-request-in-a-github-action/76215842#76215842
+            github.rest.issues.createComment({
+              body,
+              issue_number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+            });