text: /* eslint-disable *//**
   * Determines if specified line number is in the highlighted list.
   * https://github.com/alexgorbatchev
   */
  const isLineHighlighted = function(lineNumber) {
  	let linesToHighlight = this.opts.highlight || [];
  
  	if (typeof (linesToHighlight.push) !== 'function') {
  		linesToHighlight = [linesToHighlight];
  	}
  
  	return linesToHighlight.indexOf(lineNumber.toString()) !== -1;
  };
  