code: function requirePath(fromPath, require) {
    // console.log('requirePath:fromPath: ' + fromPath);
    // console.log('requirePath:require: ' + require);
    if (fromPath === null || fromPath === undefined
      || require === null || require === undefined) {
      return null;
    }
    var filePath = path.resolve(path.dirname(fromPath), require);
    return realRequirPath(filePath);
  }
docs: get required file full path
  
  @param fromPath /User/XXXX/node_modules/module/index.js
  @param require ./require
  @returns {*} /User/XXXX/node_modules/module/require/index.js