const unwidow = (str: string): string => {
	if (typeof str !== 'string') return str

	// Remove extra whitespace characters before starting.
	const clean = str.trim().replace(/\s+/g, ' ')

	// We only care about strings with at least 4 words, so if we don't find at
	// least 3 spaces in the string we can just return the cleaned up string.
	const count = clean.match(/\s/g) || []
	if (count.length < 4) return clean

	// If the last word is long enough, just return the cleaned string.
	if (clean.split(' ').pop().length > 15) return clean

	// Regex matches the last instance of a whitespace character that is followed
	// by a non-whitespace character. It then replaces the former with a
	// non-breaking space character (\u00A0).
	return clean.replace(/\s+([\S]*)(\s*)$/g, '\u00A0$1$2')
}

export default unwidow