ant-design/components/_util/getLocale.tsx

import assign from 'object-assign';

export default function getLocale(props, context, componentName, getDefaultLocale) {
  const locale = context && context.antLocale && context.antLocale[componentName] ?
    context.antLocale[componentName] : getDefaultLocale();

  const result = assign({}, locale, props.locale);
  result.lang = assign({}, locale.lang, props.locale.lang);
  return result;
}