fix app crashing when reloads overlap (#46416)

Summary:
Regarding the [issue](#44755) where the app sometimes crashes due to race condition when two reloads overlap in unfortunate way. This PR fixes it in some way by introducing throttling on reload command. For now I set it to 700ms as I was still able to reproduce it on 500-550ms for provided repro in the issue. The problem may still happen for bigger apps where reload may take more time to finish.

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[GENERAL] [FIXED] - throttle reload command

Pull Request resolved: #46416

Test Plan: I've tested on provided repro and a smaller app trying to brake it.

Reviewed By: huntie

Differential Revision: D62847076

Pulled By: cipolleschi

fbshipit-source-id: 6471f792d6b692e87e3e98a699443a88c6ef43cd

packages/community-cli-plugin/src/commands/start/attachKeyHandlers.js

@@ -19,6 +19,18 @@ import fetch from 'node-fetch';
 
 const CTRL_C = '\u0003';
 const CTRL_D = '\u0004';
+const RELOAD_TIMEOUT = 500;
+
+const throttle = (callback: () => void, timeout: number) => {
+  let previousCallTimestamp = 0;
+  return () => {
+    const currentCallTimestamp = new Date().getTime();
+    if (currentCallTimestamp - previousCallTimestamp > timeout) {
+      previousCallTimestamp = currentCallTimestamp;
+      callback();
+    }
+  };
+};
 
 export default function attachKeyHandlers({
   cliConfig,
@@ -41,11 +53,15 @@ export default function attachKeyHandlers({
     env: {FORCE_COLOR: chalk.supportsColor ? 'true' : 'false'},
   };
 
+  const reload = throttle(() => {
+    logger.info('Reloading connected app(s)...');
+    messageSocket.broadcast('reload', null);
+  }, RELOAD_TIMEOUT);
+
   const onPress = async (key: string) => {
     switch (key.toLowerCase()) {
       case 'r':
-        logger.info('Reloading connected app(s)...');
-        messageSocket.broadcast('reload', null);
+        reload();
         break;
       case 'd':
         logger.info('Opening Dev Menu...');