From a1250edbd595543ff7ab29fdfb16d960421feabf Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Mon, 30 Jun 2025 10:29:36 -0400
Subject: [PATCH] add error code

---
 .../98-reference/.generated/client-errors.md     |  6 ++++++
 packages/svelte/messages/client-errors/errors.md |  4 ++++
 packages/svelte/src/index-client.js              |  2 +-
 packages/svelte/src/internal/client/errors.js    | 16 ++++++++++++++++
 4 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/documentation/docs/98-reference/.generated/client-errors.md b/documentation/docs/98-reference/.generated/client-errors.md
index 111b0b8940..3f33e37d2e 100644
--- a/documentation/docs/98-reference/.generated/client-errors.md
+++ b/documentation/docs/98-reference/.generated/client-errors.md
@@ -74,6 +74,12 @@ Effect cannot be created inside a `$derived` value that was not itself created i
 Maximum update depth exceeded. This can happen when a reactive block or effect repeatedly sets a new value. Svelte limits the number of nested updates to prevent infinite loops
 ```
 
+### get_abort_signal_outside_reaction
+
+```
+`getAbortSignal()` can only be called inside an effect or derived
+```
+
 ### hydration_failed
 
 ```
diff --git a/packages/svelte/messages/client-errors/errors.md b/packages/svelte/messages/client-errors/errors.md
index 6d96770eba..47c2038d70 100644
--- a/packages/svelte/messages/client-errors/errors.md
+++ b/packages/svelte/messages/client-errors/errors.md
@@ -48,6 +48,10 @@ See the [migration guide](/docs/svelte/v5-migration-guide#Components-are-no-long
 
 > Maximum update depth exceeded. This can happen when a reactive block or effect repeatedly sets a new value. Svelte limits the number of nested updates to prevent infinite loops
 
+## get_abort_signal_outside_reaction
+
+> `getAbortSignal()` can only be called inside an effect or derived
+
 ## hydration_failed
 
 > Failed to hydrate the application
diff --git a/packages/svelte/src/index-client.js b/packages/svelte/src/index-client.js
index d843426ce0..0d962aacd1 100644
--- a/packages/svelte/src/index-client.js
+++ b/packages/svelte/src/index-client.js
@@ -69,7 +69,7 @@ if (DEV) {
  */
 export function getAbortSignal() {
 	if (active_reaction === null) {
-		throw new Error('TODO getAbortSignal can only be called inside a reaction');
+		e.get_abort_signal_outside_reaction();
 	}
 
 	return (active_reaction.ac ??= new AbortController()).signal;
diff --git a/packages/svelte/src/internal/client/errors.js b/packages/svelte/src/internal/client/errors.js
index a0ac021c03..93df612b85 100644
--- a/packages/svelte/src/internal/client/errors.js
+++ b/packages/svelte/src/internal/client/errors.js
@@ -341,4 +341,20 @@ export function state_unsafe_mutation() {
 	} else {
 		throw new Error(`https://svelte.dev/e/state_unsafe_mutation`);
 	}
+}
+
+/**
+ * `getAbortSignal()` can only be called inside an effect or derived
+ * @returns {never}
+ */
+export function get_abort_signal_outside_reaction() {
+	if (DEV) {
+		const error = new Error(`get_abort_signal_outside_reaction\n\`getAbortSignal()\` can only be called inside an effect or derived\nhttps://svelte.dev/e/get_abort_signal_outside_reaction`);
+
+		error.name = 'Svelte error';
+
+		throw error;
+	} else {
+		throw new Error(`https://svelte.dev/e/get_abort_signal_outside_reaction`);
+	}
 }
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