chore: adds a check for properly formatted files (google#5624)

* chore: add check for clang format

* chore: updates clang format script

.github/workflows/check_clang_format.yml

@@ -0,0 +1,27 @@
+name: test-clang-format
+on: [pull_request]
+
+jobs:
+  clang-formatter:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - uses: DoozyX/clang-format-lint-action@v0.12
+      with:
+        source: 'core'
+        extensions: 'js'
+        clangFormatVersion: 12
+        style: Google
+
+    - uses: actions/github-script@v5
+      if: failure()
+      with:
+        script: |
+          console.log(context.issue.number)
+          github.rest.issues.createComment({
+            issue_number: context.issue.number,
+            owner: context.repo.owner,
+            repo: context.repo.repo,
+            body: 'It looks like some of your files have not been formatted properly. Please run `npm run format`.'
+          })

gulpfile.js

@@ -35,6 +35,7 @@ module.exports = {
   buildAdvancedCompilationTest: buildTasks.advancedCompilationTest,
   checkin: gulp.parallel(buildTasks.checkinBuilt, typings.checkinTypings),
   checkinBuilt: buildTasks.checkinBuilt,
+  clangFormat: buildTasks.format,
   clean: gulp.parallel(buildTasks.cleanBuildDir, packageTasks.cleanReleaseDir),
   cleanBuildDir: buildTasks.cleanBuildDir,
   cleanReleaseDir: packageTasks.cleanReleaseDir,