[fix] Support adding timeout to promises

libview/src/application.ts

@@ -185,7 +185,7 @@ export function probeResourceWith(
         }
       };
       resource.uris.forEach((uri: string) =>
-        probeResourceUri(uri)
+        withTimeout(probe(uri), 250)
           .then((uri: string) => {
             remaining.push(uri);
             onFinished();
@@ -196,6 +196,35 @@ export function probeResourceWith(
   );
 }
 
+/**
+ * Wraps a promise in a new one with a timeout
+ * @param original The original promise
+ * @param wait The time to wait
+ */
+export function withTimeout<T>(original: Promise<T>, wait: number): Promise<T> {
+  return new Promise<T>(
+    (resolve: (result: T) => void, reject: (reason: any) => void) => {
+      let timeoutTriggered = false;
+      let onTimeout = () => {
+        timeoutTriggered = true;
+        reject("timeout");
+      };
+      let handle = setTimeout(onTimeout, wait);
+      original
+        .then((result: T) => {
+          if (timeoutTriggered) return;
+          clearTimeout(handle);
+          resolve(result);
+        })
+        .catch((reason: any) => {
+          if (timeoutTriggered) return;
+          clearTimeout(handle);
+          reject(reason);
+        });
+    }
+  );
+}
+
 /**
  * Probes an URI for a resource to check whether it is valid
  * @param uri An URI