How to use the umi-core/lib/getUserConfig.cleanConfigRequireCache function in umi-core

getConfig(opts = {}) {
    const { paths, cwd } = this.service;
    const { force, setConfig } = opts;
    const defaultConfig = this.service.applyPlugins('modifyDefaultConfig', {
      initialValue: {},
    });

    const file = getConfigFile(cwd);
    this.file = file;
    if (!file) {
      return defaultConfig;
    }

    // 强制读取，不走 require 缓存
    if (force) {
      cleanConfigRequireCache(cwd);
    }

    let config = null;
    const relativeFile = file.replace(`${paths.cwd}/`, '');
    this.relativeFile = relativeFile;

    const onError = (e, file) => {
      const msg = `配置文件 "${file.replace(`${paths.cwd}/`, '')}" 解析出错，请检查语法。
\r\n${e.toString()}`;
      this.printError(msg);
      throw e;
    };

    config = getConfigByConfigFile(file, {
      defaultConfig,
      onError,