tidy up

packages/svelte/src/compiler/phases/2-analyze/css/css-prune.js

@@ -55,11 +55,9 @@ const nesting_selector = {
  * @param {Compiler.AST.RegularElement | Compiler.AST.SvelteElement} element
  */
 export function prune(stylesheet, element) {
-	walk(stylesheet, { element }, visitors);
-}
+	const state = { element };
 
-/** @type {Visitors<Compiler.Css.Node, State>} */
-const visitors = {
+	walk(/** @type {Compiler.Css.Node} */ (stylesheet), state, {
 		Rule(node, context) {
 			if (node.metadata.is_global_block) {
 				context.visit(node.prelude);
@@ -86,7 +84,8 @@ const visitors = {
 			// selectors that don't belong to rules (i.e. inside `:is(...)` etc)
 			// when we encounter them below
 		}
-};
+	});
+}
 
 /**
  * Retrieves the relative selectors (minus the trailing globals) from a complex selector.
@@ -103,16 +102,12 @@ function get_relative_selectors(node) {
 
 		// nesting could be inside pseudo classes like :is, :has or :where
 		for (let selector of selectors) {
-			walk(
-				selector,
-				{},
-				{
+			walk(selector, null, {
 				// @ts-ignore
 				NestingSelector() {
 					has_explicit_nesting_selector = true;
 				}
-				}
-			);
+			});
 			// if we found one we can break from the others
 			if (has_explicit_nesting_selector) break;
 		}