---
title: 0.64.0
---

import { LinkCard } from "@astrojs/starlight/components";

<LinkCard
  title="TypeSpec Core 1.8"
  description="See changes to the TypeSpec language and core libraries"
  href="https://typespec.io/docs/release-notes/release-2026-01-13"
/>

# 0.64.0

## Features

### @azure-tools/typespec-autorest

- [#3622](https://github.com/Azure/typespec-azure/pull/3622) Add support for multiple output files in typespec-autorest
- [#3746](https://github.com/Azure/typespec-azure/pull/3746) #3693 Allow array and unknown result for async operations

### @azure-tools/typespec-azure-core

- [#3746](https://github.com/Azure/typespec-azure/pull/3746) #3693 Allow array and unknown result for async operations

### @azure-tools/typespec-azure-resource-manager

- [#3622](https://github.com/Azure/typespec-azure/pull/3622) Add support for multiple output files in typespec-autorest
- [#3746](https://github.com/Azure/typespec-azure/pull/3746) #3693 Allow array and unknown result for async operations

### @azure-tools/typespec-client-generator-core

- [#3660](https://github.com/Azure/typespec-azure/pull/3660) Add `@markAsPageable` decorator.
- [#3746](https://github.com/Azure/typespec-azure/pull/3746) #3693 Allow array and unknown result for async operations

## Bug Fixes

### @azure-tools/typespec-azure-core

- [#3747](https://github.com/Azure/typespec-azure/pull/3747) Allow final-state-via: original-uri for PATCH operations

### @azure-tools/typespec-azure-resource-manager

- [#3748](https://github.com/Azure/typespec-azure/pull/3748) Fix #3430 Allow using customAzureResource in operation templates
- [#3591](https://github.com/Azure/typespec-azure/pull/3591) Corrected spelling of 'for an operation' from 'for and operation'.
- [#3747](https://github.com/Azure/typespec-azure/pull/3747) Allow final-state-via: original-uri for PATCH operations
- [#3736](https://github.com/Azure/typespec-azure/pull/3736) Fix #3692 override parameter name and add actions for Nsp

### @azure-tools/typespec-client-generator-core

- [#3716](https://github.com/Azure/typespec-azure/pull/3716) Fix api-version parameter type to string for multi-service clients instead of using a specific enum type.
- [#3723](https://github.com/Azure/typespec-azure/pull/3723) Improve `@hierarchyBuilding` decorator diagnostic messages to include specific property names and conflict details when there are inherited property conflicts
- [#3717](https://github.com/Azure/typespec-azure/pull/3717) Remove mutation for validation.
- [#3611](https://github.com/Azure/typespec-azure/pull/3611) Generate names for anonymous models in LroMetadata.
