From c202002cd94f60fefc5d758931e20dab1155089a Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Wed, 25 Feb 2026 22:18:03 -0500
Subject: [PATCH] chore: null out current_batch before committing branches

---
 .changeset/vast-ties-wash.md                     |  5 +++++
 .../src/internal/client/dom/blocks/branches.js   |  9 +++++----
 .../src/internal/client/reactivity/batch.js      | 16 ++++++++--------
 3 files changed, 18 insertions(+), 12 deletions(-)
 create mode 100644 .changeset/vast-ties-wash.md

diff --git a/.changeset/vast-ties-wash.md b/.changeset/vast-ties-wash.md
new file mode 100644
index 0000000000..39c14b4a17
--- /dev/null
+++ b/.changeset/vast-ties-wash.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+chore: null out current_batch before committing branches
diff --git a/packages/svelte/src/internal/client/dom/blocks/branches.js b/packages/svelte/src/internal/client/dom/blocks/branches.js
index 6b77903574..a8096e0a58 100644
--- a/packages/svelte/src/internal/client/dom/blocks/branches.js
+++ b/packages/svelte/src/internal/client/dom/blocks/branches.js
@@ -68,9 +68,10 @@ export class BranchManager {
 		this.#transition = transition;
 	}
 
-	#commit = () => {
-		var batch = /** @type {Batch} */ (current_batch);
-
+	/**
+	 * @param {Batch} batch
+	 */
+	#commit = (batch) => {
 		// if this batch was made obsolete, bail
 		if (!this.#batches.has(batch)) return;
 
@@ -221,7 +222,7 @@ export class BranchManager {
 				this.anchor = hydrate_node;
 			}
 
-			this.#commit();
+			this.#commit(batch);
 		}
 	}
 }
diff --git a/packages/svelte/src/internal/client/reactivity/batch.js b/packages/svelte/src/internal/client/reactivity/batch.js
index edaac0c37c..96209d3ee4 100644
--- a/packages/svelte/src/internal/client/reactivity/batch.js
+++ b/packages/svelte/src/internal/client/reactivity/batch.js
@@ -87,7 +87,7 @@ export class Batch {
 	/**
 	 * When the batch is committed (and the DOM is updated), we need to remove old branches
 	 * and append new ones by calling the functions added inside (if/each/key/etc) blocks
-	 * @type {Set<() => void>}
+	 * @type {Set<(batch: Batch) => void>}
 	 */
 	#commit_callbacks = new Set();
 
@@ -207,19 +207,19 @@ export class Batch {
 				reset_branch(e, t);
 			}
 		} else {
+			// If sources are written to, then work needs to happen in a separate batch, else prior sources would be mixed with
+			// newly updated sources, which could lead to infinite loops when effects run over and over again.
+			previous_batch = this;
+			current_batch = null;
+
 			// append/remove branches
-			for (const fn of this.#commit_callbacks) fn();
+			for (const fn of this.#commit_callbacks) fn(this);
 			this.#commit_callbacks.clear();
 
 			if (this.#pending === 0) {
 				this.#commit();
 			}
 
-			// If sources are written to, then work needs to happen in a separate batch, else prior sources would be mixed with
-			// newly updated sources, which could lead to infinite loops when effects run over and over again.
-			previous_batch = this;
-			current_batch = null;
-
 			flush_queued_effects(render_effects);
 			flush_queued_effects(effects);
 
@@ -479,7 +479,7 @@ export class Batch {
 		this.flush();
 	}
 
-	/** @param {() => void} fn */
+	/** @param {(batch: Batch) => void} fn */
 	oncommit(fn) {
 		this.#commit_callbacks.add(fn);
 	}