chore: add lint & fix issues

Author: mdjastrzebski

examples/cookbook/App.tsx

@@ -1,16 +1,8 @@
 import * as React from 'react';
-import { SafeAreaView } from 'react-native';
-import { LoginForm } from './components/LoginForm';
-import { Home } from './components/Home';
+import { View } from 'react-native';
 
 const App = () => {
-  const [user, setUser] = React.useState<string | null>(null);
-
-  return (
-    <SafeAreaView>
-      {user == null ? <LoginForm onLoginSuccess={setUser} /> : <Home user={user} />}
-    </SafeAreaView>
-  );
+  return <View />;
 };
 
 export default App;

examples/cookbook/__tests__/App.test.tsx

@@ -1,13 +1,8 @@
 import * as React from 'react';
 
-export type User = { name: string } | null;
-export const UserProvider = React.createContext<User | undefined>(undefined);
+export type User = { name: string };
+export const UserProvider = React.createContext<User | null>(null);
 
 export function useUser() {
-  const user = React.useContext(UserProvider);
-  if (user === undefined) {
-    throw new Error('useUser must be used within a UserProvider');
-  }
-
-  return user;
+  return React.useContext(UserProvider);
 }

examples/cookbook/components/Home.tsx

@@ -4,7 +4,7 @@ import { User, UserProvider } from './providers/user-provider';
 import { Theme, ThemeProvider } from './providers/theme-provider';
 
 interface RenderWithProvidersProps {
-  user?: User;
+  user?: User | null;
   theme?: Theme;
 }
 

examples/cookbook/components/LoginForm.tsx

@@ -7,7 +7,7 @@
     "web": "expo start --web",
     "eject": "expo eject",
     "test": "jest",
-    "lint": "lint",
+    "lint": "eslint .",
     "typecheck": "tsc --noEmit"
   },
   "dependencies": {