fix: correctly differentiate static fields before emitting duplicate_class_field

Author: Ocean-OS

.changeset/nine-cups-film.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: correctly differentiate static fields before emitting `duplicate_class_field`

packages/svelte/src/compiler/phases/2-analyze/visitors/ClassBody.js

@@ -57,7 +57,10 @@ export function ClassBody(node, context) {
 				e.state_field_duplicate(node, name);
 			}
 
-			const _key = (key.type === 'PrivateIdentifier' ? '#' : '') + name;
+			const _key =
+				(node.type === 'AssignmentExpression' || !node.static ? '' : '@') +
+				(key.type === 'PrivateIdentifier' ? '#' : '') +
+				name;
 			const field = fields.get(_key);
 
 			// if there's already a method or assigned field, error
@@ -91,7 +94,10 @@ export function ClassBody(node, context) {
 			if (child.kind === 'constructor') {
 				constructor = child;
 			} else if (!child.computed) {
-				const key = (child.key.type === 'PrivateIdentifier' ? '#' : '') + get_name(child.key);
+				const key =
+					(child.static ? '@' : '') +
+					(child.key.type === 'PrivateIdentifier' ? '#' : '') +
+					get_name(child.key);
 				const field = fields.get(key);
 				if (!field) {
 					fields.set(key, [child.kind]);