code: function tryRender(path, rootPath) {
    try {
      renderFile(path, rootPath);
    } catch (e) {
      // keep watching when error occured.
      console.error(errorToString(e) + '\x07');
    }
  }
docs: Try to render `path`; if an exception is thrown it is printed to stderr and
  otherwise ignored.
  
  This is used in watch mode.