ApolloServer constructor - semantic error TS2554: Expected 0 arguments, but got 1

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trying to setup apollo with express and keep getting the error

semantic error TS2554: Expected 0 arguments, but got 1.

with this code:

import { PrismaClient } from '@prisma/client';
import { ApolloServer } from '@apollo/server';
import { expressMiddleware } from '@apollo/server/express4';
import { ApolloServerPluginDrainHttpServer } from '@apollo/server/plugin/drainHttpServer';
import express from 'express';
import { getDatabaseConnectionString } from './utils/config';
import bodyParser from 'body-parser';
import http from 'http';

const app = express();
const httpServer = http.createServer(app);

const typeDefs = `#graphql  
  type Book {
    title: String
    author: String
  }
  
  type Query {
    books: [Book]
  }
`;

const books = [
  {
    title: 'Good Book',
    author: 'Person Man'
  }
];

const resolvers = {
  Query: {
    books: () => books
  }
};

const server = new ApolloServer({
  typeDefs,
  resolvers,
  plugins: [ApolloServerPluginDrainHttpServer({ httpServer })]
});
await server.start();

app.use(
  '/',
  bodyParser.json(),
  // expressMiddleware accepts the same arguments:
  // an Apollo Server instance and optional configuration options
  expressMiddleware(server, {
    context: async ({ req }) => ({
      prismaClient: new PrismaClient({
        datasources: {
          db: {
            url: getDatabaseConnectionString()
          }
        }
      })
    })
  })
);

await new Promise<void>(resolve => httpServer.listen({ port: 4000 }, resolve));
console.log(`🚀 Server ready at http://localhost:4000/`);

says line 38 where I do new ApolloServer(..., if i remove the parameters it says start() doesn’t exist on ApolloServer. not sure what the issue is.

thanks.