1  'use strict';
 2  
 3  const detectNewline = string => {
 4  	if (typeof string !== 'string') {
 5  		throw new TypeError('Expected a string');
 6  	}
 7  
 8  	const newlines = string.match(/(?:\r?\n)/g) || [];
 9  
10  	if (newlines.length === 0) {
11  		return;
12  	}
13  
14  	const crlf = newlines.filter(newline => newline === '\r\n').length;
15  	const lf = newlines.length - crlf;
16  
17  	return crlf > lf ? '\r\n' : '\n';
18  };
19  
20  module.exports = detectNewline;
21  module.exports.graceful = string => (typeof string === 'string' && detectNewline(string)) || '\n';