# Retired compiler warning ASPIREATS001

<Badge
  text="Version introduced: 13.2"
  variant="note"
  size="large"
  class:list={'mb-1'}
/>

<Badge
  text="Retired in: 13.4"
  variant="tip"
  size="large"
  class:list={'mb-1'}
/>

`ASPIREATS001` was emitted by Aspire 13.2 and 13.3 when code used Aspire Type System (ATS) types and attributes while TypeScript AppHost support was still in preview. This diagnostic no longer applies in Aspire 13.4 and later because TypeScript AppHosts are generally available.

## If you still see this warning

Upgrade the Aspire CLI, AppHost SDK, and hosting integration packages to Aspire 13.4 or later. After upgrading, remove any `ASPIREATS001` suppressions from _.editorconfig_ files, project files, and `#pragma warning` blocks.

<LearnMore>
  For more information, see [What's new in Aspire 13.4](/whats-new/aspire-13-4/)
  and [TypeScript AppHosts](/app-host/typescript-apphost/).
</LearnMore>