fix: remove implements from class declaration

Author: ciscorn

.changeset/calm-maps-cover.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: remove implements from class declarations

packages/svelte/src/compiler/phases/1-parse/remove_typescript_nodes.js

@@ -115,6 +115,9 @@ const visitors = {
 		if (node.declare) {
 			return b.empty;
 		}
+		if (node.implements) {
+			delete node.implements
+		}
 		return context.next();
 	},
 	VariableDeclaration(node, context) {