Make sure that we have a correct stack trace during async rendering i…

…n dev

src/core-tags/core/await/renderer.js

@@ -50,10 +50,19 @@ function requestData(provider, timeout) {
         timeout = 10000;
     }
 
+    var error;
+    var errorMsg = "Timed out after " + timeout + "ms";
+    // eslint-disable-next-line no-constant-condition
+    if ("MARKO_DEBUG") {
+        // Make sure we have a meaningful stack trace in development preparing the stacktrace upfront.
+        // If we create it inside the setTimeout, we will end up with a short, not meaningful, stack trace
+        // We only do it in development to avoid overhead in production
+        error = new Error(errorMsg);
+    }
     if (timeout > 0) {
         let timeoutId = setTimeout(function() {
             timeoutId = null;
-            var error = new Error("Timed out after " + timeout + "ms");
+            if (!error) error = new Error(errorMsg);
             error.code = "ERR_AWAIT_TIMEDOUT";
             error.name = "TimeoutError";
             asyncValue.___reject(error);