export function findEndIndexOfCSSExpression(text: string, isAtEndOfInput: boolean): number | null {
	// CSS expression can end *on* a semicolon or *before* a brace. In either
	// case we treat the remaining part of the value to cover one character
	// before that symbol.
	const semicolonIndex = text.indexOf(';');
	const braceIndex = text.indexOf('}');

	if (semicolonIndex === -1 && braceIndex === -1) {
		if (isAtEndOfInput) {
			return text.length;
		} else {
			return null;
		}
	} else if (semicolonIndex === -1) {
		return braceIndex - 1;
	} else if (braceIndex === -1) {
		return semicolonIndex - 1;
	} else {
		return Math.min(semicolonIndex, braceIndex) - 1;
	}
}