add all frontend files

node_modules/rc-util/es/utils/get.js

@@ -0,0 +1,10 @@
+export default function get(entity, path) {
+  var current = entity;
+  for (var i = 0; i < path.length; i += 1) {
+    if (current === null || current === undefined) {
+      return undefined;
+    }
+    current = current[path[i]];
+  }
+  return current;
+}