fix

Author: Rich-Harris

packages/svelte/src/compiler/phases/3-transform/server/transform-server.js

@@ -2024,7 +2024,8 @@ export function server_component(analysis, options) {
 
 		if (
 			node.body.type === 'ExpressionStatement' &&
-			node.body.expression.type === 'AssignmentExpression'
+			node.body.expression.type === 'AssignmentExpression' &&
+			node.body.expression.left.type !== 'MemberExpression'
 		) {
 			for (const id of extract_identifiers(node.body.expression.left)) {
 				const binding = analysis.instance.scope.get(id.name);

packages/svelte/src/compiler/phases/scope.js

@@ -361,7 +361,8 @@ export function create_scopes(ast, root, allow_reactive_declarations, parent) {
 
 			if (
 				node.body.type === 'ExpressionStatement' &&
-				node.body.expression.type === 'AssignmentExpression'
+				node.body.expression.type === 'AssignmentExpression' &&
+				node.body.expression.left.type !== 'MemberExpression'
 			) {
 				for (const id of extract_identifiers(node.body.expression.left)) {
 					if (!id.name.startsWith('$')) {