diff --git a/.github/workflows/auto-lint.yml b/.github/workflows/auto-lint.yml
new file mode 100644
index 0000000..57a5b53
--- /dev/null
+++ b/.github/workflows/auto-lint.yml
@@ -0,0 +1,14 @@
+name: Code Linting
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  Lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v2
+      - name: Run CodeSniffer
+        uses: discoverygarden/CodeSniffer@v1
diff --git a/src/DependencyFieldMapGenerator.php b/src/DependencyFieldMapGenerator.php
index 242cbf6..33ffbff 100644
--- a/src/DependencyFieldMapGenerator.php
+++ b/src/DependencyFieldMapGenerator.php
@@ -115,7 +115,7 @@ public function getReferentialFieldMap() {
    */
   public function getReferencingFields($entity_type_id) {
     $map = $this->getReferentialFieldMap();
-    return isset($map[$entity_type_id]) ? $map[$entity_type_id] : [];
+    return $map[$entity_type_id] ?? [];
   }
 
 }