Zod table+field descriptor generic schema

z.array(
  z.object({
    field: z.union([
      z
        .object({
          table: z.literal("scenarists"),
          field: createInsertSchema(scenarists).keyof(),
        })
        .transform(({ table, field }) => tables[table][field]),
      z
        .object({
          table: z.literal("users"),
          field: createInsertSchema(users).keyof(),
        })
        .transform(({ table, field }) => tables[table][field]),
    ]),
    order: z.enum(Object.keys(orders) as [keyof typeof orders]),
  }),
)

const createFieldDescriptorSchema = <T extends Table>(table: T) =>
  z
    .object({
      table: z.literal(table._.name as T["_"]["name"]),
      field: createInsertSchema(table).keyof(),
    })
    .transform((descriptor) => table[descriptor.field]);

Type 'addQuestionMarks<baseObjectOutputType<{ table: ZodLiteral<T["_"]["name"]>; field: ZodEnum<CastToStringTuple<UnionToTuple<keyof BuildInsertSchema<T, {}, false>, []>>>; }>, any>["field"] | undefined' cannot be used to index type 'T'.ts(2536)