export function addClass(code: string, classes: string | string[], tag?: string): string {
	const classRE = new RegExp(`<${tag ?? '\w+'}[^>]*class="([\\w+-:;\\\/* ]*)"`)
	classes = !Array.isArray(classes) ? [classes] : classes

	return code.replace(classRE, (match, previousClasses) => {
		return match.replace(previousClasses, `${previousClasses} ${classes}`)
	})
}