# codegen-react-hooks

# Type: boolean

In the same way as codegen-methods, but generate React apollo hooks instead

Supports Subscriptions since 0.6.4

# Exemple

sgts -e https://json-placeholder-graphql.herokuapp.com/graphql --codegen-react-hooks

Generated result exemple

export const usePosts = (
  fragment: string | DocumentNode,
  options?: QueryHookOptions<{ posts: Post[] }, postsArgs>
) => {
  const { isString, isFragment, fragmentName } = guessFragmentType(fragment);
  const query = sgtsQL`
      query posts ($userId: Int) {
        posts(userId: $userId) {
          ${isString ? fragment : '...' + fragmentName}
        }
      } ${isFragment ? fragment : ''}
      `;

  return useQuery<{ posts: Post[] }, postsArgs>(query, options);
};

# Usage

WARNING

You must have installed @apollo/react-hooks for this to work. And obviously having a HOC Apollo provider!

Exemple for a Query

import { usePost } from '~/generated.ts';

const Hello = () => {
  const { loading, error, data } = usePost(`id title`, { id: 5 });
  if (loading) return <p>Loading ...</p>;
  return <h1>Hello {data.posts.title}!</h1>;
};

Exemple for a Mutation

import { useLogin } from '~/generated.ts';

const Login = () => {
  const [email, setEmail] = useState('');
  const [password, setPassword] = useState('');

  const [login, { loading }] = useLogin(`
    user {
      id
      name
    }
    token
  `);
  const { data } = await login({
    variables: { data: { email, password } },
  });
};

TIP

Also, Sgts will generate all pageInfo fragment for pagination

See codegen-methods for exemple