From my medium post about Keycloak Auth in GraphQL

keycloak-connect-graphql-directives-example.js

const typeDefs = gql`
  type Article {
    id: ID!
    title: String!
    content: String!
  }

  type Query {
    listArticles: [Article]! @auth
  }

  type Mutation {
    publishArticle(title: String!, content: String!): Article! @hasRole(role: "editor")
  }
`

const resolvers = {
  Query: {
    listArticles: (obj, args, context, info) => {
      return Database.listArticles()
    }
  },
  mutation: {
    publishArticle: (object, args, context, info) => {
      const user = context.kauth.accessToken.content // get the user details from the access token
      return Database.createArticle(args.title, args.content, user)
    }
  }
}