From a9530e5330374fc95c06c2227a3ae7fe686b3033 Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Thu, 2 Apr 2026 16:07:23 -0400
Subject: [PATCH] chore: add labels to more internal deriveds (#18050)

tiny QoL thing
---
 packages/svelte/src/internal/client/dom/blocks/each.js | 5 +++++
 packages/svelte/src/reactivity/date.js                 | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/packages/svelte/src/internal/client/dom/blocks/each.js b/packages/svelte/src/internal/client/dom/blocks/each.js
index 3acdf80d84..5f8adee1b5 100644
--- a/packages/svelte/src/internal/client/dom/blocks/each.js
+++ b/packages/svelte/src/internal/client/dom/blocks/each.js
@@ -42,6 +42,7 @@ import { DEV } from 'esm-env';
 import { derived_safe_equal } from '../../reactivity/deriveds.js';
 import { current_batch } from '../../reactivity/batch.js';
 import * as e from '../../errors.js';
+import { tag } from '../../dev/tracing.js';
 
 // When making substantive changes to this file, validate them with the each block stress test:
 // https://svelte.dev/playground/1972b2cf46564476ad8c8c6405b23b7b
@@ -205,6 +206,10 @@ export function each(node, flags, get_collection, get_key, render_fn, fallback_f
 		return is_array(collection) ? collection : collection == null ? [] : array_from(collection);
 	});
 
+	if (DEV) {
+		tag(each_array, '{#each ...}');
+	}
+
 	/** @type {V[]} */
 	var array;
 
diff --git a/packages/svelte/src/reactivity/date.js b/packages/svelte/src/reactivity/date.js
index 8e2b5d41ab..f882c05d76 100644
--- a/packages/svelte/src/reactivity/date.js
+++ b/packages/svelte/src/reactivity/date.js
@@ -95,6 +95,10 @@ export class SvelteDate extends Date {
 							return date_proto[method].apply(this, args);
 						});
 
+						if (DEV) {
+							tag(d, `SvelteDate.${method}()`);
+						}
+
 						this.#deriveds.set(method, d);
 
 						set_active_reaction(reaction);