src: return message and stack trace on unhandled error in dev

src/env.ts

@@ -1,4 +1,8 @@
 export interface Env {
+  /**
+   * Environment the worker is running in
+   */
+  ENVIRONMENT: 'dev' | 'staging' | 'prod';
   /**
    * R2 bucket we read from
    */

src/worker.ts

@@ -13,16 +13,29 @@ interface Worker {
 const cloudflareWorker: Worker = {
   fetch: async (request, env, ctx) => {
     const cache = caches.default;
-    switch (request.method) {
-      case 'HEAD':
-      case 'GET':
-        return handlers.get(request, env, ctx, cache);
-      case 'POST':
-        return handlers.post(request, env, ctx, cache);
-      case 'OPTIONS':
-        return handlers.options(request, env, ctx, cache);
-      default:
-        return responses.METHOD_NOT_ALLOWED;
+    try {
+      switch (request.method) {
+        case 'HEAD':
+        case 'GET':
+          return handlers.get(request, env, ctx, cache);
+        case 'POST':
+          return handlers.post(request, env, ctx, cache);
+        case 'OPTIONS':
+          return handlers.options(request, env, ctx, cache);
+        default:
+          return responses.METHOD_NOT_ALLOWED;
+      }
+    } catch (e) {
+      let responseBody = 'Internal Server Error';
+
+      if (env.ENVIRONMENT === 'dev' && e instanceof Error) {
+        responseBody += `\nMessage: ${e.message}\nStack trace: ${e.stack}`;
+      }
+
+      return new Response(responseBody, {
+        status: 500,
+        headers: { 'cache-control': 'no-store' },
+      });
     }
   },
 };