defineMigrations

{
  firstVersion?: CurrentVersion extends number
    ? FirstVersion
    : never
  currentVersion?: CurrentVersion
  migrators?: CurrentVersion extends number
    ? FirstVersion extends number
      ? CurrentVersion extends FirstVersion
        ? {
            [version in Exclude<
              Range<1, CurrentVersion>,
              0
            >]: Migration
          }
        : {
            [version in Exclude<
              Range<FirstVersion, CurrentVersion>,
              FirstVersion
            >]: Migration
          }
      : {
          [version in Exclude<
            Range<1, CurrentVersion>,
            0
          >]: Migration
        }
    : never
  subTypeKey?: string
  subTypeMigrations?: Record<string, BaseMigrationsInfo>
}