Invalid URL error when using Svelte Inspector after updating to Vite 7.1.0

[samal-rasmussen]

Describe the bug

@sveltejs/vite-plugin-svelte-inspector doesn't do anything after updating to Vite 7.1.0. In the dev tools network tab I can see the request is failing with a 500 error with the response body being:

launch-editor-middleware: invalid URL.

Request info:

Request URL
http://localhost:5173/__open-in-editor?file=src%2Froutes%2F%2Bpage.svelte%3A2%3A1

Request Method
GET

Status Code
500 Internal Server Error

Remote Address
127.0.0.1:5173

Referrer Policy
strict-origin-when-cross-origin

Reproduction URL

https://github.com/samal-rasmussen/svelte-inspector-invalid-url-error-reproduction

Reproduction

The reproduction repo is just four commits.

1. Install minimal Svelte template
2. Update npm packages to exact versions for better reproducability
3. Enable inspector (it works here)
4. Update Vite from 7.0.6 to 7.1.0 (it breaks here)

Logs

System Info

System:
    OS: macOS 15.5
    CPU: (8) arm64 Apple M1 Pro
    Memory: 83.63 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.17.0 - ~/.nvm/versions/node/v22.17.0/bin/node
    Yarn: 1.22.22 - /opt/homebrew/bin/yarn
    npm: 10.9.2 - ~/.nvm/versions/node/v22.17.0/bin/npm
    pnpm: 9.4.0 - ~/Library/pnpm/pnpm
    Watchman: 2025.06.30.00 - /opt/homebrew/bin/watchman
  Browsers:
    Brave Browser: 138.1.80.124
    Chrome: 138.0.7204.101
    Safari: 18.5
  npmPackages:
    @sveltejs/adapter-auto: 6.0.1 => 6.0.1 
    @sveltejs/kit: 2.27.1 => 2.27.1 
    @sveltejs/vite-plugin-svelte: 6.1.0 => 6.1.0 
    svelte: 5.38.0 => 5.38.0 
    vite: 7.1.0 => 7.1.0

[samal-rasmussen]

Found where I believe the error is produced:
https://github.com/yyx990803/launch-editor/blob/373558c1d97db8a57ea34b9860f50a058d5c6850/packages/launch-editor-middleware/index.js#L25

[dominikg]

yeah, that seems to be the cause. going to file that in vite

[dominikg]

fixed in vite 7.1.1