astro/.changeset/yellow-tips-cover.md

astro
patch

Deprecate returning simple objects from endpoints. Endpoints should only return a Response.

To return a result with a custom encoding not supported by a Response, you can use the ResponseWithEncoding utility class instead.

Before:

export function GET() {
  return {
    body: '...',
    encoding: 'binary',
  };
}

After:

export function GET({ ResponseWithEncoding }) {
  return new ResponseWithEncoding('...', undefined, 'binary');
}