declare hostChecking at top of function

src/server/command/ssh.ts

@@ -6,11 +6,12 @@ export default function sshOptions(
   { pass, path, command, host, port, auth, knownhosts }: { [s: string]: string },
   key?: string
 ): string[] {
+  var hostChecking;
   const cmd = parseCommand(command, path);
   if (knownhosts !== '/dev/null') {
-    var hostChecking = 'yes';
+    hostChecking = 'yes';
   } else {
-    var hostChecking = 'no';
+    hostChecking = 'no';
   }
   const sshRemoteOptsBase = [
     'ssh',