[vite] server routes return handler file contents instead of proper response during `vite dev`

[alan-agius4]

Environment

Node: 22.18.0 nitro-nightly: 3.0.0-20250717-115429.740761af

Reproduction

In https://github.com/nitrojs/vite-examples/tree/main/examples/basic-service run the below to create a simple server route.

$ mkdir api
touch api/story.ts
echo "export default defineEventHandler(event => 'Hello')" > api/story.ts

$ vite dev

In another terminal run

curl http://localhost:5174/api/story
export default defineEventHandler((event) => "Hello");

//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInN0b3J5LnRzIl0sInNvdXJjZXNDb250ZW50IjpbImV4cG9ydCBkZWZhdWx0IGRlZmluZUV2ZW50SGFuZGxlcihldmVudCA9PiAnSGVsbG8nKVxuIl0sIm1hcHBpbmdzIjoiQUFBQSxlQUFlLG1CQUFtQixXQUFTLE9BQU87Ii

Describe the bug

When using vite dev server routes return the transformed handler contents.

Additional context

This is not an issue with vite build.

[pi0]

Thanks for report. This is known issue currently. (with vite plugin, only service entries like server.ts work and vite takes over other routes) it will be fixed.