fix(typo): existance -> existence

src/compiler/compile/css/Selector.ts

@@ -532,11 +532,11 @@ function has_definite_elements(result: Map<Element, NodeExist>): boolean {
 
 function add_to_map(from: Map<Element, NodeExist>, to: Map<Element, NodeExist>) {
 	from.forEach((exist, element) => {
-		to.set(element, higher_existance(exist, to.get(element)));
+		to.set(element, higher_existence(exist, to.get(element)));
 	});
 }
 
-function higher_existance(exist1: NodeExist | null, exist2: NodeExist | null): NodeExist {
+function higher_existence(exist1: NodeExist | null, exist2: NodeExist | null): NodeExist {
 	if (exist1 === undefined || exist2 === undefined) return exist1 || exist2;
 	return exist1 > exist2 ? exist1 : exist2;
 }