With paths.base configured, index page is inaccessible without a trailing slash

[ebeloded]

Describe the bug

When kit.paths.base is configured, the index page cannot be accessed without a trailing slash. Adjacent pages work.

Config:

const config = {
  kit: {
    paths: {
      base: '/admin',
    }
}

files:

src/routes/index.svelte
src/routes/not-index.svelte

With the above setup, here's how it works:

/admin - 404 (but expected index)
/admin/ - index
/admin/not-index - not-index

Reproduction

The issue reproduced on Stackblitz: https://stackblitz.com/edit/sveltekit-44rsrt?file=svelte.config.js

When the app is running, try navigating to /admin to see the 404.

Repo: https://github.com/ebeloded/sveltekit-base-path-index-issue

Logs

No response

System Info

System:
    OS: Linux undefined
    CPU: (4) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: Unknown - /bin/jsh
  Binaries:
    Node: 14.16.0 - /usr/local/bin/node
    Yarn: 1.22.10 - /bin/yarn
    npm: 7.17.0 - /bin/npm
  npmPackages:
    @sveltejs/kit: next => 1.0.0-next.196 
    svelte: ^3.42.6 => 3.44.2

Severity

blocking all usage of SvelteKit

Additional Information

We need to be able to use the app from a non-root path and having a working index page is critical

[aplotor]

+1 i am experiencing the same issue. also, static-adapter build fails with error > 404 (linked from /) when kit.paths.base is configured.

[nhe23]

With the current version of Sveltekit (v1.0.0-next.232) I cannot reproduce this issue. Here is my repo: https://github.com/nhe23/test-2886. It also works in the stackblitz-repo that is mentioned in the issue description, which uses the newest version of Sveltekit.

[ebeloded]

Yay!