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;
}