GraphQL Scalar Types

1. ID - Used to store unique identifier
2. String
3. Booelan
4. Int
5. Float

  type Query {
      title: String!
      price: Float!
      releaseYear: Int
      rating: Float
      inStock: Boolean!
  }

const resolvers = {
  Query: {
    title() {
      return 'The War of Art'
    },
    price() {
      return 12.99
    },
    releaseYear() {
      return null
    },
    rating() {
      return 5
    },
    inStock() {
      return true
    }
  }
}

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See Also https://graphql.org/learn/schema/#scalar-types