.mjs files are not supported on our CDN

[rob-balfre]

Describe the bug

kit: {
  adapter: adapter({ fallback: 'index.html' }),
  prerender: { entries: [] }
}

We have a very simple SPA setup on our kit projects and we use an archaic corporate CDN to serve our sites. Big B2B applications, no need for SSR etc.

Since the recent change to output .mjs files our sites no longer work as our CDN doesn't recognise .mjs files correctly...

Would it be possible to have an escape hatch so we can still generate .js files at build?

Thanks!

Reproduction

See above

Logs

No response

System Info

System:
    OS: macOS 13.2.1
    CPU: (8) arm64 Apple M1
    Memory: 107.53 MB / 8.00 GB
    Shell: 5.8.1 - /bin/zsh
  Binaries:
    Node: 18.10.0 - ~/.nvm/versions/node/v18.10.0/bin/node
    Yarn: 1.22.10 - /usr/local/bin/yarn
    npm: 8.19.2 - ~/.nvm/versions/node/v18.10.0/bin/npm
  Browsers:
    Chrome: 110.0.5481.100
    Firefox: 108.0.1
    Firefox Nightly: 106.0a1
    Safari: 16.3
    Safari Technology Preview: 16.4
  npmPackages:
    @sveltejs/adapter-static: ^2.0.0 => 2.0.1 
    @sveltejs/kit: ^1.5.0 => 1.8.3 
    svelte: ^3.54.0 => 3.55.1 
    vite: ^4.0.0 => 4.1.4

Severity

blocking an upgrade

Additional Information

No response

[Conduitry]

Duplicate of #9141.

[ctm-balfre-robert]

@Conduitry hehe Rich just asked me to open it on twitter. All good