text: const { createServer } = require('graphql-yoga')
  
  const server = createServer({ 
    typeDefs: /* GraphQL */ `
      type Query {
        hello(name: String): String!
      }
    `,
    resolvers: {
      Query: {
      hello: (_, { name }) => `Hello ${name || 'World'}`,
      },
    },
   })
  
  server.start()
  