astro/.changeset/afraid-apricots-buy.md

astro
minor

Adapters can now specify the build output type they're intended for using the adapterFeatures.buildOutput property. This property can be used to always generate a server output, even if the project doesn't have any server-rendered pages.

{
  'astro:config:done': ({ setAdapter, config }) => {
    setAdapter({
      name: 'my-adapter',
      adapterFeatures: {
        buildOutput: 'server',
      },
    });
  },
}

If your adapter specifies buildOutput: 'static', and the user's project contains server-rendered pages, Astro will warn in development and error at build time. Note that a hybrid output, containing both static and server-rendered pages, is considered to be a server output, as a server is required to serve the server-rendered pages.