From 600eb308e248601a1cc6828828c149bd8b36a395 Mon Sep 17 00:00:00 2001
From: Jovi De Croock <decroockjovi@gmail.com>
Date: Tue, 25 Jun 2024 20:29:07 +0200
Subject: [PATCH] Throw error when auto-tracking with React 19

---
 .changeset/sharp-rockets-march.md  | 5 +++++
 packages/react/runtime/src/auto.ts | 7 +++++++
 2 files changed, 12 insertions(+)
 create mode 100644 .changeset/sharp-rockets-march.md

diff --git a/.changeset/sharp-rockets-march.md b/.changeset/sharp-rockets-march.md
new file mode 100644
index 000000000..83afdaf8c
--- /dev/null
+++ b/.changeset/sharp-rockets-march.md
@@ -0,0 +1,5 @@
+---
+"@preact/signals-react": patch
+---
+
+Throw an error when auto-tracking is used with React 19
diff --git a/packages/react/runtime/src/auto.ts b/packages/react/runtime/src/auto.ts
index 96f20b646..5c56c027e 100644
--- a/packages/react/runtime/src/auto.ts
+++ b/packages/react/runtime/src/auto.ts
@@ -2,6 +2,7 @@ import {
 	// @ts-ignore-next-line
 	// eslint-disable-next-line @typescript-eslint/no-unused-vars
 	__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED as ReactInternals,
+	version as reactVersion,
 } from "react";
 import React from "react";
 import jsxRuntime from "react/jsx-runtime";
@@ -378,6 +379,12 @@ export function installJSXHooks() {
 }
 
 export function installAutoSignalTracking() {
+	const [major] = reactVersion.split(".").map(Number);
+	if (major >= 19) {
+		throw new Error(
+			"Automatic signals tracking is not supported in React 19 and later, try the Babel plugin instead https://github.com/preactjs/signals/tree/main/packages/react-transform#signals-react-transform."
+		);
+	}
 	installCurrentDispatcherHook();
 	installJSXHooks();
 }