How to: schema.graphql
extend type Query {
  hello: String! @resolve
}
```

```js
// main.js
Parse.Cloud.define('hello', async () => {
  return 'Hello world!';
});
```

You can now run your custom query using GraphQL Playground:

```graphql
query {
  hello
}
```

You should receive the response below:

```json
{
  "data": {
    "hello": "Hello world!"
  }
}
```