first commit

frontend/node_modules/rc-overflow/es/hooks/channelUpdate.js

@@ -0,0 +1,12 @@
+import raf from "rc-util/es/raf";
+export default function channelUpdate(callback) {
+  if (typeof MessageChannel === 'undefined') {
+    raf(callback);
+  } else {
+    var channel = new MessageChannel();
+    channel.port1.onmessage = function () {
+      return callback();
+    };
+    channel.port2.postMessage(undefined);
+  }
+}