Checking if a Schema is a Class in TypeScript

class Person extends Schema.Class<Person>("Person")({
  id: Schema.optional(S.Number),
  name: Schema.NonEmptyString,
}) {}

type IsSchemaClass<T> = T extends Schema.Class<any, any, any, any, any, any, any> ? true : false

type Result = IsSchemaClass<Person> // Here Result is `false`

type ExtractSchemaClassFields<T> = T extends Schema.Class<any, infer Fields, any, any, any, any, any> ? Fields : never