Dev server don't autodiscover new routes

[MacFJA]

Describe the bug

If the dev server is running, SvelteKit don't see newly added routes, and result in 404 when navigating to them.

Reproduction

• Create a new project (npm init svelte@next my-app + select the Skeleton project, should also be true for demo app)
• Install the project (npm install)
• Start the dev server (npm run dev)
• Add a new page in src/routes (ex: src/routes/test.svelte)
• Try to navigate to the route (with the previous example: http://localhost:3000/test)

Logs

// Server console side
09:50:09 [vite] page reload .svelte-kit/dev/generated/manifest.js

// Browser side
404
Not found: /test
Error: Not found: /test
    at render_page (file:///private/tmp/sk/my-app/node_modules/@sveltejs/kit/dist/ssr.js:1318:11)
    at async resolve (file:///private/tmp/sk/my-app/node_modules/@sveltejs/kit/dist/ssr.js:1663:12)
    at async respond (file:///private/tmp/sk/my-app/node_modules/@sveltejs/kit/dist/ssr.js:1614:10)
    at async Immediate.<anonymous> (file:///private/tmp/sk/my-app/node_modules/@sveltejs/kit/dist/chunks/index.js:3458:22)

System Info

System:
    OS: macOS 10.15.7
    CPU: (8) x64 Intel(R) Core(TM) i5-8279U CPU @ 2.40GHz
    Memory: 78.90 MB / 8.00 GB
    Shell: 3.2.57 - /bin/bash
  Binaries:
    Node: 14.16.1 - /opt/local/bin/node
    Yarn: 1.22.10 - /opt/local/bin/yarn
    npm: 6.14.8 - /opt/local/bin/npm
  Browsers:
    Safari: 14.1.2
  npmPackages:
    @sveltejs/kit: next => 1.0.0-next.139
    svelte: ^3.34.0 => 3.41.0

Severity

serious, but I can work around it

Additional Information

The file .svelte-kit/dev/generated/manifest.js is correctly generated.

But SvelteKit don't seem to reload it (it is only load at here: .svelte-kit//dev/runtime/internal/start.js)

A simple workaround is to stop and restart server every times a new route is created, in DX point of view it's not ideal

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Initial Discord message: https://discord.com/channels/457912077277855764/819723698415599626/870925145554952222

[yash1094]

I have been, having the same issue. I have tried to downgrade the version but to no avail.

[shadman-felicity]

Same issue.

[WillsterJohnson]

I've had a similar issue, but only when refreshing the page manually or entering the url. Links to the new page/resource seem to work as expected.

[CaptainCodeman]

same here, seems to be more so for server endpoints consistently

am using Typescript in case that is the common denominator (if maybe other people don't have the issue)

[shaneturner]

Same here.

Changes to existing routes work fine, and are rendered near instantly, but if I add a new route file it isn't detected and gives a 404 error.
If I exit the dev server and reload it picks up the changes. This occurs with both the Demo and Skeleton projects.
I've search around a bit and tried adding some vite specific changes to set usePolling to true, but to no effect.