stop loadtest if server exits

Author: enisdenjo

internal/perf/src/loadtest.ts

@@ -85,7 +85,7 @@ export async function loadtest(opts: LoadtestOptions) {
     }
   })();
 
-  await waitForExit;
+  await Promise.race([waitForExit, server.waitForExit]);
 
   return { memoryInMBSnapshots };
 }

internal/proc/src/index.ts

@@ -9,6 +9,7 @@ import { fetch } from '@whatwg-node/fetch';
 import terminate from 'terminate/promise';
 
 export interface Proc extends AsyncDisposable {
+  waitForExit: Promise<void>;
   getStd(o: 'out' | 'err' | 'both'): string;
   getStats(): Promise<{
     // Total CPU utilization (of all cores) as a percentage.
@@ -84,6 +85,7 @@ export function spawn(
   let stderr = '';
   let stdboth = '';
   const proc: Proc = {
+    waitForExit,
     getStd(o) {
       switch (o) {
         case 'out':