Apply suggestions from code review

Co-authored-by: Rich Harris <rich.harris@vercel.com>

.changeset/hot-buses-end.md

@@ -2,4 +2,4 @@
 'svelte': patch
 ---
 
-feat: add parent hierarchy to \_\_svelte_meta objects at dev time
+feat: add parent hierarchy to `__svelte_meta` objects

packages/svelte/src/compiler/phases/3-transform/client/visitors/shared/utils.js

@@ -416,14 +416,12 @@ export function with_dev_stack(call_expression, node, type, additional) {
 	return b.stmt(
 		b.call(
 			'$.with_dev_stack',
-			b.arrow([], b.block([b.stmt(call_expression)])),
+			b.arrow([], call_expression),
 			b.literal(type),
 			b.literal(filename),
 			b.literal(location.line),
 			b.literal(location.column),
-			additional
-				? b.object(Object.entries(additional).map(([key, value]) => b.init(key, b.literal(value))))
-				: b.null
+			additional && b.object(Object.entries(additional).map(([k, v]) => b.init(k, b.literal(v))))
 		)
 	);
 }

packages/svelte/src/internal/client/context.js

@@ -39,22 +39,21 @@ export function set_dev_stack(stack) {
  * @returns {any}
  */
 export function with_dev_stack(callback, type, file, line, column, additional) {
-	/** @type {DevStackEntry} */
-	const new_entry = {
+	const parent = dev_stack;
+
+	dev_stack = {
 		type,
 		file,
 		line,
 		column,
-		parent: dev_stack,
+		parent,
 		...additional
 	};
-	const previous_stack = dev_stack;
-	dev_stack = new_entry;
 
 	try {
 		return callback();
 	} finally {
-		dev_stack = previous_stack;
+		dev_stack = parent;
 	}
 }