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How to Use Graphql Typescript Types In React.js?

5 minutes read

To use GraphQL TypeScript types in React.js, you need to first define your GraphQL schema and generate TypeScript types from it using a tool like graphql-code-generator. Once you have your types generated, you can import them into your React components and use them to typesafe your GraphQL queries, mutations, and components.


You can use TypeScript interfaces or type aliases to define the shape of your GraphQL data and use these types to annotate your queries and mutation functions. This way, you can ensure that your data is correctly typed and avoid runtime errors.


Additionally, you can use TypeScript generics to create reusable higher-order components that handle the fetching and caching of GraphQL data. This makes it easier to manage complex data fetching logic in your React application.


Overall, using GraphQL TypeScript types in React.js helps improve the type safety and maintainability of your codebase by providing compile-time checks and autocomplete support.


How to query GraphQL data with TypeScript in React?

To query GraphQL data with TypeScript in React, you can use tools like Apollo Client, which provide TypeScript support out of the box. Here is a simple example of how you can query GraphQL data with TypeScript in React using Apollo Client:

  1. Install Apollo Client:
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npm install @apollo/client graphql


  1. Define your GraphQL query using gql template literal tag from graphql-tag:
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import { gql } from '@apollo/client';

const GET_USERS = gql`
  query {
    users {
      id
      name
    }
  }
`;


  1. Create a functional component to fetch and render the GraphQL data:
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import React from 'react';
import { useQuery } from '@apollo/client';

const UsersList: React.FC = () => {
  const { loading, error, data } = useQuery(GET_USERS);

  if (loading) return <p>Loading...</p>;
  if (error) return <p>Error :(</p>;

  return (
    <ul>
      {data.users.map((user: { id: number; name: string }) => (
        <li key={user.id}>{user.name}</li>
      ))}
    </ul>
  );
};

export default UsersList;


  1. Use the UsersList component in your main App component:
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import React from 'react';
import { ApolloClient, InMemoryCache, ApolloProvider } from '@apollo/client';

import UsersList from './UsersList';

const client = new ApolloClient({
  uri: 'https://your-graphql-endpoint.com',
  cache: new InMemoryCache()
});

const App: React.FC = () => {
  return (
    <ApolloProvider client={client}>
      <div>
        <h1>GraphQL Users List</h1>
        <UsersList />
      </div>
    </ApolloProvider>
  );
};

export default App;


  1. Finally, run your React app and you should see the list of users fetched from the GraphQL server.


This is a basic example of how to query GraphQL data with TypeScript in React using Apollo Client. You can customize and expand upon this example based on your specific requirements.


How to create custom GraphQL types in TypeScript for React?

To create custom GraphQL types in TypeScript for React, follow these steps:

  1. Define the schema: Start by defining the schema for your GraphQL types. This includes defining the fields and their types.
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const typeDefs = `
  scalar Date

  type User {
    id: ID!
    name: String!
    email: String!
    birthDate: Date!
  }

  type Query {
    users: [User]
  }
`;


  1. Create resolvers: Next, create resolvers for your custom GraphQL types. Resolvers are functions that resolve the values for each field in your GraphQL type.
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const resolvers = {
  Query: {
    users: () => {
      return getUsers();
    },
  },
};

const getUsers = () => {
  // Fetch users data from the API or database
  return [
    {
      id: '1',
      name: 'John Doe',
      email: 'johndoe@example.com',
      birthDate: new Date('1990-01-01'),
    },
    {
      id: '2',
      name: 'Jane Doe',
      email: 'janedoe@example.com',
      birthDate: new Date('1995-05-10'),
    },
  ];
};


  1. Create GraphQL client: Use a GraphQL client like Apollo Client to interact with your GraphQL server. Create a client instance and provide the type definitions and resolvers.
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const client = new ApolloClient({
  cache: new InMemoryCache(),
  link: new HttpLink({
    uri: 'http://localhost:4000',
  }),
  typeDefs,
  resolvers,
});


  1. Initialize the client: Initialize the client with the provided type definitions and resolvers.
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client.onResetStore(() => client.writeQuery({ query: GET_USERS, data: { users: [] } }));
client.writeData({ data: { users: getUsers() } });


  1. Use the custom GraphQL types in React components: Use the custom GraphQL types in your React components by querying the data using GraphQL queries.
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const GET_USERS = gql`
  query {
    users {
      id
      name
      email
      birthDate
    }
  }
`;

const UsersList = () => {
  const { data, loading, error } = useQuery(GET_USERS);

  if (loading) return <p>Loading...</p>;
  if (error) return <p>Error: {error.message}</p>;

  return (
    <ul>
      {data.users.map((user) => (
        <li key={user.id}>
          <p>Name: {user.name}</p>
          <p>Email: {user.email}</p>
          <p>Birth Date: {user.birthDate}</p>
        </li>
      ))}
    </ul>
  );
};


By following these steps, you can create custom GraphQL types in TypeScript for React and query the data using GraphQL queries in your components.


How to update data in a GraphQL server using TypeScript in React?

To update data in a GraphQL server using TypeScript in React, you can follow these steps:

  1. Define a GraphQL mutation query in your GraphQL schema to update the data. For example, you can create a mutation query to update a user's name:
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mutation updateUser($id: ID!, $name: String!) {
  updateUser(id: $id, name: $name) {
    id
    name
  }
}


  1. Implement the mutation in your GraphQL server using a resolver function. The resolver function should update the data in the database and return the updated data.
  2. In your React component, use the Apollo Client library to send the mutation query to the GraphQL server. You can create a GraphQL mutation component using the useMutation hook from Apollo Client. Here is an example of how you can use the useMutation hook in your React component: 
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import { useMutation } from '@apollo/client';

const UPDATE_USER = gql`
  mutation updateUser($id: ID!, $name: String!) {
    updateUser(id: $id, name: $name) {
      id
      name
    }
  }
`;

const MyComponent = ({ userId, newName }) => {
  const [updateUser] = useMutation(UPDATE_USER);

  const handleUpdateUser = async () => {
    try {
      await updateUser({
        variables: { id: userId, name: newName },
      });
    } catch (error) {
      console.error('Error updating user:', error);
    }
  };

  return (
    <button onClick={handleUpdateUser}>Update user</button>
  );
};


  1. After updating the data in the GraphQL server, the updated data will be returned in the response of the mutation query. You can use this data to update the state of your React component and reflect the changes in the UI.


By following these steps, you can update data in a GraphQL server using TypeScript in a React application.

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