AI generateObject doesn't accept schema

const result = yield* AiLanguageModel.generateObject({
  messages: [{ role: "user", content: prompt }],
  model: "gpt-4o",
  schema: Schema.Struct({
    stock: Schema.Array(StockSchema),
    summary: Schema.String,
  }),
});

Type 'Struct<{ stock: Array$<Struct<{ sku: optional<typeof String$>; batchNumber: optional<typeof String$>; quantity: optional<typeof Number$>; expiryDate: optional<typeof String$>; }>>; summary: typeof String$; }>' is not assignable to type 'Schema<unknown, Record<string, unknown>, unknown>'.