From df3779dc865976bfb706a9b93b9ff612f4de8a6b Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Mon, 14 Apr 2025 12:08:47 -0400
Subject: [PATCH] WIP

---
 packages/svelte/src/internal/client/proxy.js  | 11 +------
 .../src/internal/client/reactivity/sources.js | 29 +------------------
 2 files changed, 2 insertions(+), 38 deletions(-)

diff --git a/packages/svelte/src/internal/client/proxy.js b/packages/svelte/src/internal/client/proxy.js
index 6302e39901..abe2022d3a 100644
--- a/packages/svelte/src/internal/client/proxy.js
+++ b/packages/svelte/src/internal/client/proxy.js
@@ -14,19 +14,10 @@ import {
 import { PROXY_ONCHANGE_SYMBOL, STATE_SYMBOL } from './constants.js';
 import { get_stack } from './dev/tracing.js';
 import * as e from './errors.js';
-import { batch_onchange, set, source, state } from './reactivity/sources.js';
+import { set, source, state } from './reactivity/sources.js';
 
 const array_methods = ['push', 'pop', 'shift', 'unshift', 'splice', 'reverse', 'sort'];
 
-/**
- * Used to prevent batching in case we are not setting the length of an array
- * @param {any} fn
- * @returns
- */
-function identity(fn) {
-	return fn;
-}
-
 /**
  * @template T
  * @param {T} value
diff --git a/packages/svelte/src/internal/client/reactivity/sources.js b/packages/svelte/src/internal/client/reactivity/sources.js
index 17e8dfff72..a26fa1a5ad 100644
--- a/packages/svelte/src/internal/client/reactivity/sources.js
+++ b/packages/svelte/src/internal/client/reactivity/sources.js
@@ -27,8 +27,7 @@ import {
 	UNOWNED,
 	MAYBE_DIRTY,
 	BLOCK_EFFECT,
-	ROOT_EFFECT,
-	PROXY_ONCHANGE_SYMBOL
+	ROOT_EFFECT
 } from '../constants.js';
 import * as e from '../errors.js';
 import { legacy_mode_flag, tracing_mode_flag } from '../../flags/index.js';
@@ -47,32 +46,6 @@ export function set_inspect_effects(v) {
 	inspect_effects = v;
 }
 
-/** @type {null | Set<() => void>} */
-let onchange_batch = null;
-
-/**
- * @param {Function} fn
- */
-export function batch_onchange(fn) {
-	// @ts-expect-error
-	return function (...args) {
-		let previous_onchange_batch = onchange_batch;
-
-		try {
-			onchange_batch = new Set();
-
-			// @ts-expect-error
-			return fn.apply(this, args);
-		} finally {
-			for (const onchange of /** @type {Set<() => void>} */ (onchange_batch)) {
-				onchange();
-			}
-
-			onchange_batch = previous_onchange_batch;
-		}
-	};
-}
-
 /**
  * @template V
  * @param {V} v