gRPC Support (#20)

src-web/lib/minPromiseMillis.ts

@@ -1,9 +1,19 @@
 import { sleep } from './sleep';
 
+/** Ensures a promise takes at least a certain number of milliseconds to resolve */
 export async function minPromiseMillis<T>(promise: Promise<T>, millis: number) {
   const start = Date.now();
-  const result = await promise;
+  let result;
+  let err;
+
+  try {
+    result = await promise;
+  } catch (e) {
+    err = e;
+  }
+
   const delayFor = millis - (Date.now() - start);
   await sleep(delayFor);
-  return result;
+  if (err) throw err;
+  else return result;
 }