From e7a001a43313b2112c876ea1b440f629e8217938 Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Mon, 2 Jun 2025 15:02:28 -0400
Subject: [PATCH] private class fields

---
 .../phases/3-transform/client/visitors/ClassBody.js        | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/packages/svelte/src/compiler/phases/3-transform/client/visitors/ClassBody.js b/packages/svelte/src/compiler/phases/3-transform/client/visitors/ClassBody.js
index 3b6885e535..849197e50c 100644
--- a/packages/svelte/src/compiler/phases/3-transform/client/visitors/ClassBody.js
+++ b/packages/svelte/src/compiler/phases/3-transform/client/visitors/ClassBody.js
@@ -69,7 +69,12 @@ export function ClassBody(node, context) {
 		}
 
 		if (name[0] === '#') {
-			body.push(/** @type {PropertyDefinition} */ (context.visit(definition, child_state)));
+			let value = definition.value
+				? /** @type {CallExpression} */ (context.visit(definition.value, child_state))
+				: undefined;
+
+			if (dev) value = b.call('$.tag', value, b.literal(name));
+			body.push(b.prop_def(definition.key, value));
 		} else if (field.node === definition) {
 			const member = b.member(b.this, field.key);