antd-mobile/2x/es/utils/merge-locale.js

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export function mergeLocale(base, patch) {
  function merge(a, b) {
    if (typeof a !== 'object' || typeof b !== 'object' || Array.isArray(a) || Array.isArray(b)) {
      return b !== undefined ? b : a;
    }
    const result = {};
    for (const key in a) {
      if (a.hasOwnProperty(key)) {
        result[key] = merge(a[key], b[key]);
      }
    }
    return result;
  }
  return merge(base, patch);
}