docs: function requireJSON5(filename) {
      if ( path.extname(filename) == '' ) filename += fs.existsSync(filename + '.json5') ? '.json5' : '.json';
      try {
          return JSON5.parse(stripBOM(fs.readFileSync(filename, 'utf8')));
      }
      catch(error) {
          error.message = filename + ": " + error.message;
          throw error;
      }
  }