Adds a loading animation

api/lighthouse-report.js

@@ -11,6 +11,14 @@ exports.handler = function(event, context, callback) {
   }
 
   const apiKey = process.env.GOOGLE_CLOUD_API_KEY;
+
+  if (!apiKey) {
+    callback(null, {
+      statusCode: 500,
+      body: JSON.stringify({ error: 'API key (GOOGLE_CLOUD_API_KEY) not set'}),
+    });
+  }
+
   const endpoint = `https://www.googleapis.com/pagespeedonline/v5/runPagespeed?url=${encodeURIComponent(url)}&category=PERFORMANCE&category=ACCESSIBILITY&category=BEST_PRACTICES&category=SEO&category=PWA&strategy=mobile&key=${apiKey}`;
   
   axios.get(endpoint)