Comment on PRs when released

.github/workflows/publish.yml

@@ -46,7 +46,34 @@ jobs:
           name: npm-logs
           path: ~/.npm/_logs
       - name: Create a Release
+        id: create-release
         uses: softprops/action-gh-release@v1
         with:
           tag_name: ${{ steps.push.outputs.tag-name }}
-          generate_release_notes: true
+          generate_release_notes: true     
+      - name: Comment on PRs with link to release they are included in
+        uses: actions/github-script@v6
+        env:
+          RELEASE_ID: ${{ steps.create-release.outputs.id }}
+        with:
+          script: |
+            const releaseId = process.env.RELEASE_ID;
+            console.log(`Fetching release_id: ${releaseId} ...`);
+            const getReleaseResponse = await github.rest.repos.getRelease({
+              release_id: process.env.RELEASE_ID,
+              owner: context.repo.owner,
+              repo: context.repo.repo
+            });
+            const release = getReleaseResponse.data;
+
+            const prNumbersInRelease = new Set(Array.from(release.body.matchAll(/\/pull\/(\d+)/g)).map(p=>p[1]));
+
+            for(let prNumber of prNumbersInRelease) {
+              console.log(`Adding comment on PR #${prNumber} ...`);
+              await github.rest.issues.createComment({
+                issue_number: prNumber,
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                body: `The changes in this PR were just released in [${release.name}](https://github.com/${context.repo.owner}/${context.repo.repo}/releases/tag/${release.tag_name}) 🎉.`
+              })
+            }