code: function buildIncludePaths(options) {
    options.includePaths = options.includePaths || [];
  
    if (process.env.hasOwnProperty('SASS_PATH')) {
      options.includePaths = options.includePaths.concat(
        process.env.SASS_PATH.split(path.delimiter)
      );
    }
  
    // Preserve the behaviour people have come to expect.
    // This behaviour was removed from Sass in 3.4 and
    // LibSass in 3.5.
    options.includePaths.unshift(process.cwd());
  
    return options.includePaths.join(path.delimiter);
  }
docs: Build an includePaths string
  from the options.includePaths array and the SASS_PATH environment variable
  
  @param {Object} options
  @api private