feat: expo getCookie helper

docs/content/docs/integrations/expo.mdx

@@ -295,24 +295,16 @@ $fetch('/api/secure-endpoint', {
 
 #### Option 2: Adding the Cookie to Request Headers
 
-If you prefer using your own fetch client, you can retrieve the session cookie stored in `SecureStore` and add it to your request headers manually.
-
-By default, the cookie is stored in `SecureStore` with the key `better-auth_cookie`. You can change this key by setting a custom `storagePrefix` in the client configuration. If you do, ensure you retrieve the cookie using the new prefix (e.g., `myapp_cookie`).
+If you prefer using your own fetch client, you can retrieve the session cookie stored in the device using `authClient.getCookie` and manually add it to your request headers.
 
 ```tsx
-import * as SecureStore from 'expo-secure-store';
-
-const getCookies = async () => {
-  const cookieName = 'better-auth_cookie'; // Update if using a custom prefix
-  return await SecureStore.getItemAsync(cookieName);
-};
+import { authClient } from '@/lib/auth-client';
 
 const makeAuthenticatedRequest = async () => {
-  const cookies = await getCookies();
+  const cookies = authClient.getCookie(); // [!code highlight]
   const headers = {
-    'Cookie': cookies,
+    'Cookie': cookies, // [!code highlight]
   };
-
   const response = await fetch('http://localhost:8081/api/secure-endpoint', { headers });
   const data = await response.json();
   return data;
@@ -322,7 +314,9 @@ const makeAuthenticatedRequest = async () => {
 **Exampe: Usage With TRPC**
     
 ```tsx title="lib/trpc-provider.tsx"
-import { createTRPCReact } from "@trpc/react-query";
+//...other imports
+import { authClient } from "@/lib/auth-client"; // [!code highlight]
+
 export const api = createTRPCReact<AppRouter>();
 
 export function TRPCProvider(props: { children: React.ReactNode }) {
@@ -334,7 +328,7 @@ export function TRPCProvider(props: { children: React.ReactNode }) {
           //...your other options
           headers() {
             const headers = new Map<string, string>(); // [!code highlight]
-            const cookies = SecureStore.getItemAsync ("better-auth_cookie"); // [!code highlight]
+            const cookies = authClient.getCookie(); // [!code highlight]
             if (cookies) { // [!code highlight]
               headers.set("Cookie", cookies); // [!code highlight]
             } // [!code highlight]

packages/expo/src/client.ts

@@ -71,7 +71,7 @@ function getSetCookie(header: string) {
 	return JSON.stringify(toSetCookie);
 }
 
-function getCookie(cookie: string) {
+export function getCookie(cookie: string) {
 	let parsed = {} as Record<string, StoredCookie>;
 	try {
 		parsed = JSON.parse(cookie) as Record<string, StoredCookie>;
@@ -105,16 +105,37 @@ export const expoClient = (opts?: ExpoClientOptions) => {
 	return {
 		id: "expo",
 		getActions(_, $store) {
-			if (Platform.OS === "web") return {};
-			store = $store;
-			const localSession = storage.getItem(cookieName);
-			localSession &&
-				$store.atoms.session.set({
-					data: JSON.parse(localSession),
-					error: null,
-					isPending: false,
-				});
-			return {};
+			if (Platform.OS !== "web") {
+				store = $store;
+				const localSession = storage.getItem(cookieName);
+				localSession &&
+					$store.atoms.session.set({
+						data: JSON.parse(localSession),
+						error: null,
+						isPending: false,
+					});
+			}
+			return {
+				/**
+				 * Get the stored cookie.
+				 *
+				 * You can use this to get the cookie stored in the device and use it in your fetch
+				 * requests.
+				 *
+				 * @example
+				 * ```ts
+				 * const cookie = client.getCookie();
+				 * fetch("https://api.example.com", {
+				 * 	headers: {
+				 * 		cookie,
+				 * 	},
+				 * });
+				 */
+				getCookie: () => {
+					const cookie = storage.getItem(cookieName);
+					return getCookie(cookie || "{}");
+				},
+			};
 		},
 		fetchPlugins: [
 			{