Clarify types (help TS compiler)

alexdima · alexdima · commit 0b8d4ccedb68 · 2018-10-31T14:34:58.000+01:00
diff --git a/src/vs/workbench/parts/performance/electron-browser/startupTimings.ts b/src/vs/workbench/parts/performance/electron-browser/startupTimings.ts
@@ -75,11 +75,11 @@ class StartupTimings implements IWorkbenchContribution {
 			return;
 		}
 
-		const waitWhenNoCachedData = () => {
+		const waitWhenNoCachedData: () => Promise<void> = () => {
 			// wait 15s for cached data to be produced
 			return !didUseCachedData()
 				? timeout(15000)
-				: Promise.resolve();
+				: Promise.resolve<void>();
 		};
 
 		Promise.all([
