add all frontend files

node_modules/rc-util/lib/createChainedFunction.js

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+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = createChainedFunction;
+/**
+ * Safe chained function
+ *
+ * Will only create a new function if needed,
+ * otherwise will pass back existing functions or null.
+ *
+ * @returns {function|null}
+ */
+function createChainedFunction() {
+  var args = [].slice.call(arguments, 0);
+  if (args.length === 1) {
+    return args[0];
+  }
+  return function chainedFunction() {
+    for (var i = 0; i < args.length; i++) {
+      if (args[i] && args[i].apply) {
+        args[i].apply(this, arguments);
+      }
+    }
+  };
+}