From f3f113f72564e6241a0e5e5f632263e840d40b5f Mon Sep 17 00:00:00 2001
From: tido64 <4123478+tido64@users.noreply.github.com>
Date: Thu, 29 Oct 2026 09:20:16 +0000
Subject: [PATCH] fix: declare support for React 19.3

React Native 0.88 requires `react@^19.3.0`, but the `react` peer range
ended at 19.2, causing npm `ERESOLVE` in `init` and generated apps.

Also make `set-react-version` fail when the React version required by
React Native falls outside the `react` peer range.
---
 packages/app/package.json                     |  2 +-
 .../scripts/internal/set-react-version.mts    | 29 +++++++++++++++++--
 yarn.lock                                     |  2 +-
 3 files changed, 28 insertions(+), 5 deletions(-)

diff --git a/packages/app/package.json b/packages/app/package.json
index 7272df5c3..fad6d4b79 100644
--- a/packages/app/package.json
+++ b/packages/app/package.json
@@ -117,7 +117,7 @@
   "peerDependencies": {
     "@callstack/react-native-visionos": "0.76 - 0.79",
     "@expo/config-plugins": ">=5.0",
-    "react": "18.2 - 19.2",
+    "react": "18.2 - 19.3",
     "react-native": "0.76 - 0.88 || >=0.89.0-0 <0.89.0",
     "react-native-macos": "^0.0.0-0 || 0.76 - 0.81",
     "react-native-windows": "^0.0.0-0 || 0.76 - 0.83"
diff --git a/packages/app/scripts/internal/set-react-version.mts b/packages/app/scripts/internal/set-react-version.mts
index 458d500e5..53c2ff973 100644
--- a/packages/app/scripts/internal/set-react-version.mts
+++ b/packages/app/scripts/internal/set-react-version.mts
@@ -6,7 +6,7 @@ import * as fs from "node:fs";
 import * as path from "node:path";
 import * as util from "node:util";
 import manifest from "../../package.json" with { type: "json" };
-import { isMain, readJSONFile } from "../helpers.js";
+import { isMain, readJSONFile, toVersionNumber, v } from "../helpers.js";
 import type { Manifest } from "../types.ts";
 import { writeJSONFile } from "../utils/filesystem.mjs";
 import { fetchPackageMetadata, npmRegistryBaseURL } from "../utils/npm.mjs";
@@ -152,6 +152,26 @@ function fetchReactNativeWindowsCanaryInfoViaNuGet(): Promise<Manifest> {
     .then((version) => fetchPackageInfo("react-native-windows", version));
 }
 
+/**
+ * Throws if the React version required by React Native is not covered by our
+ * `react` peer range.
+ */
+function assertReactPeerRange(reactVersion: string): void {
+  const range = manifest.peerDependencies["react"];
+  const m = range.match(/ - (\d+)\.(\d+)$/);
+  if (!m) {
+    throw new Error(`Unexpected 'react' peer range: ${range}`);
+  }
+
+  const [, maxMajor, maxMinor] = m.map(Number);
+  if (toVersionNumber(reactVersion) >= v(maxMajor, maxMinor + 1, 0)) {
+    throw new Error(
+      `react@${reactVersion} is not covered by the 'react' peer range ` +
+        `(${range}); please update 'peerDependencies' in 'package.json'`
+    );
+  }
+}
+
 /**
  * Returns an object with common dependencies.
  */
@@ -189,14 +209,17 @@ async function resolveCommonDependencies(
   const rncliIOS =
     devDependencies["@react-native-community/cli-platform-ios"] ?? rncli;
 
+  // Replace range to avoid React version mismatch
+  const react = peerDependencies["react"].replace(/^\^/, "");
+  assertReactPeerRange(react);
+
   return {
     "@react-native-community/cli": rncli,
     "@react-native-community/cli-platform-android": rncliAndroid,
     "@react-native-community/cli-platform-ios": rncliIOS,
     "@react-native/babel-preset": rnBabelPresetVersion,
     "@react-native/metro-config": rnMetroConfigVersion,
-    // Replace range to avoid React version mismatch
-    react: peerDependencies["react"].replace(/^\^/, ""),
+    react,
   };
 }
 
diff --git a/yarn.lock b/yarn.lock
index 59380e5af..64864f9d4 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -12991,7 +12991,7 @@ __metadata:
   peerDependencies:
     "@callstack/react-native-visionos": 0.76 - 0.79
     "@expo/config-plugins": ">=5.0"
-    react: 18.2 - 19.2
+    react: 18.2 - 19.3
     react-native: 0.76 - 0.88 || >=0.89.0-0 <0.89.0
     react-native-macos: ^0.0.0-0 || 0.76 - 0.81
     react-native-windows: ^0.0.0-0 || 0.76 - 0.83