Não estou conseguindo rodar o npm start

Boa tarde, não consegui ainda rodar o npm start, da um erro:

Meu index.js:

const { Apolloserver } = require('apollo-server')
const userSchema = require ('./user/schema/user.graphql')

const users = [
    {
        nome: "Ana",
        ativo: true 
    },
    {
        nome:"Marcia",
        ativo: false
    }
]

const typeDefs = [userSchema]
const resolvers = {}

const server = new Apolloserver( { typeDefs, resolvers } )

Meu user.graphql:

const { gql } = require('apollo-server')

const userSchema = gql `
    type User {
        nome: String!
        ativo: Boolean!
        email: String
    }
`

module.exports = userSchema

Meu package.json:

{
  "name": "roteiro",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "nodemon -e js,json,graphql ./api/index.js",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "repository": {
    "type": "git",
    "url": "git+https://github.com/alura-cursos/1922-graphql.git"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "bugs": {
    "url": "https://github.com/alura-cursos/1922-graphql/issues"
  },
  "homepage": "https://github.com/alura-cursos/1922-graphql#readme",
  "dependencies": {
    "json-server": "^0.16.1",
    "nodemon": "^2.0.4"
  }
}