Replace all line breaks with br elements

JavaScript version

const nl2br = (str) => str.replace(new RegExp('\r?\n', 'g'), '<br>');

// In React
str.split('\n').map((item, index) => (
    <React.Fragment key={index}>
        {item}
        <br />
    </React.Fragment>
));

TypeScript version

const nl2br = (str: string): string => str.replace(new RegExp('\r?\n', 'g'), '<br>');