perf(ai): Run AI iterations using setImmediate (#999)

Use `setImmediate` to run each async iteration of the MCTS bot. In most scenarios this will use a polyfill as `setImmediate` is not widely supported or on a web standards track. See <https://github.com/YuzuJS/setImmediate> for browser support details.

Author: delucis

package-lock.json

@@ -161,6 +161,7 @@
     "react-cookies": "^0.1.0",
     "redux": "^4.1.0",
     "rfc6902": "^4.0.2",
+    "setimmediate": "^1.0.5",
     "socket.io": "^4.1.3",
     "socket.io-client": "^4.1.3",
     "svelte": "^3.41.0",

package.json

@@ -5,6 +5,7 @@
  * license that can be found in the LICENSE file or at
  * https://opensource.org/licenses/MIT.
  */
+import 'setimmediate';
 import { CreateGameReducer } from '../core/reducer';
 import { Bot } from './bot';
 import type { BotAction } from './bot';
@@ -313,7 +314,7 @@ export class MCTSBot extends Bot {
         const asyncIteration = () => {
           if (this.iterationCounter < numIterations) {
             iteration();
-            setTimeout(asyncIteration, 0);
+            setImmediate(asyncIteration);
           } else {
             resolve(getResult());
           }