From e8a7c426d4f80afca31821997ef412824831328b Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Wed, 11 Jun 2025 19:38:10 -0400
Subject: [PATCH 1/2] remove errant log

---
 .../runtime-runes/samples/flush-sync-no-scheduled/_config.js     | 1 -
 1 file changed, 1 deletion(-)

diff --git a/packages/svelte/tests/runtime-runes/samples/flush-sync-no-scheduled/_config.js b/packages/svelte/tests/runtime-runes/samples/flush-sync-no-scheduled/_config.js
index 33a59dfbd3..85e06fa8ec 100644
--- a/packages/svelte/tests/runtime-runes/samples/flush-sync-no-scheduled/_config.js
+++ b/packages/svelte/tests/runtime-runes/samples/flush-sync-no-scheduled/_config.js
@@ -5,7 +5,6 @@ export default test({
 		const btn = target.querySelector('button');
 		const main = target.querySelector('main');
 		ok(main);
-		console.log(main.innerHTML);
 		assert.htmlEqual(main.innerHTML, `<div>true</div>`);
 		// we don't want to use flush sync (or tick that use it inside) since we are testing that calling `flushSync` once
 		// when there are no scheduled effects does not cause reactivity to break

From f5a020d56bdf07cba501895a496c036172a6d995 Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Wed, 11 Jun 2025 20:26:45 -0400
Subject: [PATCH 2/2] fix: correctly tag private class state fields (#16132)

---
 .changeset/three-steaks-wash.md               |  5 +++
 .../3-transform/client/visitors/ClassBody.js  |  2 +-
 .../samples/inspect-trace-class/_config.js    | 31 +++++++++++++++++++
 .../samples/inspect-trace-class/main.svelte   | 28 +++++++++++++++++
 4 files changed, 65 insertions(+), 1 deletion(-)
 create mode 100644 .changeset/three-steaks-wash.md
 create mode 100644 packages/svelte/tests/runtime-runes/samples/inspect-trace-class/_config.js
 create mode 100644 packages/svelte/tests/runtime-runes/samples/inspect-trace-class/main.svelte

diff --git a/.changeset/three-steaks-wash.md b/.changeset/three-steaks-wash.md
new file mode 100644
index 0000000000..caf0ea2bfe
--- /dev/null
+++ b/.changeset/three-steaks-wash.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: correctly tag private class state fields
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 e78a8824dd..5bd9add2a5 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
@@ -78,7 +78,7 @@ export function ClassBody(node, context) {
 				? /** @type {CallExpression} */ (context.visit(definition.value, child_state))
 				: undefined;
 
-			if (dev) {
+			if (dev && field.node === definition) {
 				value = b.call('$.tag', value, b.literal(`${declaration.id?.name ?? '[class]'}.${name}`));
 			}
 
diff --git a/packages/svelte/tests/runtime-runes/samples/inspect-trace-class/_config.js b/packages/svelte/tests/runtime-runes/samples/inspect-trace-class/_config.js
new file mode 100644
index 0000000000..98b3fb6cbc
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/inspect-trace-class/_config.js
@@ -0,0 +1,31 @@
+import { flushSync } from 'svelte';
+import { test } from '../../test';
+import { normalise_trace_logs } from '../../../helpers.js';
+
+export default test({
+	compileOptions: {
+		dev: true
+	},
+
+	test({ assert, target, logs }) {
+		assert.deepEqual(normalise_trace_logs(logs), [
+			{ log: 'effect' },
+			{ log: '$state', highlighted: true },
+			{ log: 'Counter.#count', highlighted: false },
+			{ log: 0 }
+		]);
+
+		logs.length = 0;
+
+		const button = target.querySelector('button');
+		button?.click();
+		flushSync();
+
+		assert.deepEqual(normalise_trace_logs(logs), [
+			{ log: 'effect' },
+			{ log: '$state', highlighted: true },
+			{ log: 'Counter.#count', highlighted: false },
+			{ log: 1 }
+		]);
+	}
+});
diff --git a/packages/svelte/tests/runtime-runes/samples/inspect-trace-class/main.svelte b/packages/svelte/tests/runtime-runes/samples/inspect-trace-class/main.svelte
new file mode 100644
index 0000000000..56bd497e09
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/inspect-trace-class/main.svelte
@@ -0,0 +1,28 @@
+<script>
+	class Counter {
+		#count;
+
+		constructor() {
+			this.#count = $state(0);
+		}
+
+		get count() {
+			return this.#count;
+		}
+
+		increment = () => {
+			this.#count += 1;
+		}
+	}
+
+	const counter = new Counter();
+
+	$effect(() => {
+		$inspect.trace('effect');
+		counter.count;
+	});
+</script>
+
+<button onclick={counter.increment}>
+	clicks: {counter.count}
+</button>