GraphQL practice using node.js with Apollo Server

index.js

const { ApolloServer, gql } = require("apollo-server");

const typeDefs = gql`
  scalar Date

  """
  An object that describes the chracteristics of a ski day
  """
  type SkiDay {
    "A ski day unique ID"
    id: ID!
    "The date that a ski day occurred"
    date: Date!
    mountain: String!
    conditions: Conditions
  }

  enum Conditions {
    POWDER
    HEAVY
    ICY
  }
  type Query {
    totalDays: Int!
    allDays: [SkiDay!]!
  }

  input AddDayInput {
    date: Date!
    mountain: String!
    conditions: Conditions
  }

  type RemoveDayPayload {
    day: SkiDay!
    removed: Boolean
    totalBefore: Int
    totalAfter: Int
  }

  type Mutation {
    addDay(input: AddDayInput!): SkiDay!
    removeDay(id: ID!): RemoveDayPayload!
  }

  type Subscription {
    newDay: SkiDay!
  }
`;

const resolvers = {

};

const mocks = {
  Date: () => "1/2/2025",
  // String: () => "Cool Day",
  // Query: () => ({
  //   allDays: () => new MockList(8)
  // })
}

const server = new ApolloServer({
  typeDefs,
  mocks
});

server
  .listen()
  .then(({ url }) => console.log(`Server running at ${url}`)
);