Custom Layouts don't work when using endpoints to populate data for template

[hartwm]

Describe the bug

You can't use custom layouts if you use a named endpoint to separate data logic from template logic.

Reproduction

Create a structure such as
src/routes/hello.ts
src/routes/[email protected]
src/routes/__layout-foo.svelte

GET request to /helloand it returns body data from hello.ts not html from [email protected]

Logs

No console errors occur

System Info

System:
    OS: macOS 12.2.1
    CPU: (10) x64 Apple M1 Pro
    Memory: 22.69 MB / 32.00 GB
    Shell: 5.1.4 - /usr/local/bin/bash
  Binaries:
    Node: 16.15.1 - ~/.nvm/versions/node/v16.15.1/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 8.11.0 - ~/.nvm/versions/node/v16.15.1/bin/npm
  Browsers:
    Brave Browser: 103.1.40.105
    Chrome: 103.0.5060.114
    Edge: 103.0.1264.62
    Firefox: 102.0.1
    Safari: 15.3
  npmPackages:
    @sveltejs/adapter-auto: next => 1.0.0-next.55 
    @sveltejs/adapter-vercel: ^1.0.0-next.48 => 1.0.0-next.60 
    @sveltejs/kit: next => 1.0.0-next.368 
    svelte: ^3.46.0 => 3.47.0 
    vite: ^2.9.13 => 2.9.14

Severity

serious, but I can work around it

Additional Information

I can work around it by combining data requests and template markup into a single svelte file

[Rich-Harris]

You can't have separate hello.ts and [email protected] routes — the endpoint should be renamed to [email protected]. (The duplication is unfortunate, and would be solved by #5037, but there's some consensus-building to do before we get there.)

We should probably throw an error when you have conflicting routes like these.

[hartwm]

ahhh didn't think to try that, oversight on my end, but not intuitive thought pattern I guess considering one is for layout and one is just for passing data.
for the record if i could prerender and keep data static i would prefer to have my routes more like api/posts.ts, even if it means having to do a quick reference to it within the template file. i believe there is an open issue around this, but it would prevent me from this sort of thing anyway

[madeleineostoja]

Fixed by #5778