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node_modules/vant/es/utils/deep-clone.js

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+import { isDef } from './index';
+export function deepClone(obj) {
+  if (!isDef(obj)) {
+    return obj;
+  }
+
+  if (Array.isArray(obj)) {
+    return obj.map(function (item) {
+      return deepClone(item);
+    });
+  }
+
+  if (typeof obj === 'object') {
+    var to = {};
+    Object.keys(obj).forEach(function (key) {
+      to[key] = deepClone(obj[key]);
+    });
+    return to;
+  }
+
+  return obj;
+}