Normalizes line endings in a string.

Use String.prototype.replace() and a regular expression to match and replace line endings with the normalized version.
Omit the seconds argument, normalized, to use the default value of '\r\n'.

代码片段

const normalizeLineEndings = (str, normalized = '\r\n') => str.replace(/\r?\n/g, normalized);

使用样例

splitLines('This\r\nis a\nmultiline\nstring.\r\n'); // 'This\r\nis a\r\nmultiline\r\nstring.\r\n'
splitLines('This\r\nis a\nmultiline\nstring.\r\n', '\n'); // 'This\nis a\nmultiline\nstring.\n'