make graphql-yoga server

server.ts

import { GraphQLServer } from "graphql-yoga"
import logger from "morgan"
import cors from "cors"
import helmet from "helmet"

const createServer = async () => {
  const server = new GraphQLServer({})
  // middleware 추가
  server.express.use(logger("dev"))
  server.express.use(cors())
  server.express.use(helmet())

  return server.start({ port: 4000 })
}

createServer().then(() => console.log(`✅ Server running on http://localhost:4000`))