add all frontend files

node_modules/rc-util/lib/Dom/isVisible.js

@@ -0,0 +1,33 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+var _default = exports.default = function _default(element) {
+  if (!element) {
+    return false;
+  }
+  if (element instanceof Element) {
+    if (element.offsetParent) {
+      return true;
+    }
+    if (element.getBBox) {
+      var _getBBox = element.getBBox(),
+        width = _getBBox.width,
+        height = _getBBox.height;
+      if (width || height) {
+        return true;
+      }
+    }
+    if (element.getBoundingClientRect) {
+      var _element$getBoundingC = element.getBoundingClientRect(),
+        _width = _element$getBoundingC.width,
+        _height = _element$getBoundingC.height;
+      if (_width || _height) {
+        return true;
+      }
+    }
+  }
+  return false;
+};