Convert a string to URL slug

JavaScript version

const slugify = (str) =>
    str
        .toLowerCase()
        .replace(/\s+/g, '-')
        .replace(/[^\w-]+/g, '');

TypeScript version

const slugify = (str: string): string =>
    str
        .toLowerCase()
        .replace(/\s+/g, '-')
        .replace(/[^\w-]+/g, '');

Examples

slugify('Chapter One: Once upon a time...'); // 'chapter-one-once-upon-a-time'