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

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+import { isDef, isObject } from '.';
+var hasOwnProperty = Object.prototype.hasOwnProperty;
+
+function assignKey(to, from, key) {
+  var val = from[key];
+
+  if (!isDef(val)) {
+    return;
+  }
+
+  if (!hasOwnProperty.call(to, key) || !isObject(val)) {
+    to[key] = val;
+  } else {
+    // eslint-disable-next-line @typescript-eslint/no-use-before-define
+    to[key] = deepAssign(Object(to[key]), from[key]);
+  }
+}
+
+export function deepAssign(to, from) {
+  Object.keys(from).forEach(function (key) {
+    assignKey(to, from, key);
+  });
+  return to;
+}