Potential breaking changes in recent sveltekit

[axel-rock]

Hello,

I ran an npm update, and seriously broke my app.

For once, I tried to investigate the problem.

If I'm correct (I may totally not be), it's due to an internal SvelteKit function rejecting the cookie "paraglide:lang" because of the ":".

Here is my full stack trace, and where it leads:

TypeError: argument name is invalid
    at Module.serialize (/Users/axel/Developer/persocoms/node_modules/.pnpm/[email protected]/node_modules/cookie/index.js:194:11)
    at set_internal (/Users/axel/Developer/persocoms/node_modules/.pnpm/@[email protected]_@[email protected][email protected][email protected]/node_modules/@sveltejs/kit/src/runtime/server/cookie.js:196:23)
    at Object.set (/Users/axel/Developer/persocoms/node_modules/.pnpm/@[email protected]_@[email protected][email protected][email protected]/node_modules/@sveltejs/kit/src/runtime/server/cookie.js:117:4)
    at /Users/axel/Developer/persocoms/node_modules/.pnpm/@[email protected]_@[email protected]/node_modules/@inlang/paraglide-sveltekit/dist/runtime/hooks/handle.server.js:57:27
    at apply_handle (/Users/axel/Developer/persocoms/node_modules/.pnpm/@[email protected]_@[email protected][email protected][email protected]/node_modules/@sveltejs/kit/src/exports/hooks/sequence.js:85:11)
    at resolve (/Users/axel/Developer/persocoms/node_modules/.pnpm/@[email protected]_@[email protected][email protected][email protected]/node_modules/@sveltejs/kit/src/exports/hooks/sequence.js:110:9)
    at supabaseHandle (/Users/axel/Developer/persocoms/src/hooks.server.ts:66:9)
    at apply_handle (/Users/axel/Developer/persocoms/node_modules/.pnpm/@[email protected]_@[email protected][email protected][email protected]/node_modules/@sveltejs/kit/src/exports/hooks/sequence.js:85:11)
    at Object.eval [as handle] (/Users/axel/Developer/persocoms/node_modules/.pnpm/@[email protected]_@[email protected][email protected][email protected]/node_modules/@sveltejs/kit/src/exports/hooks/sequence.js:74:10)
    at Module.respond (/Users/axel/Developer/persocoms/node_modules/.pnpm/@[email protected]_@[email protected][email protected][email protected]/node_modules/@sveltejs/kit/src/runtime/server/respond.js:327:40)
    ```
    
    in `[email protected]`
    
    ```
    function serialize(name, val, opt) {
  var enc = (opt && opt.encode) || encodeURIComponent;

  if (typeof enc !== 'function') {
    throw new TypeError('option encode is invalid');
  }

  if (!cookieNameRegExp.test(name)) {
    throw new TypeError('argument name is invalid'); // ❌
  }

I tried to remove the ":" locally, and it indeed fixes it. 

```
/** The key with which `invalidate` is called when the language changes */

export const LANGUAGE_CHANGE_INVALIDATION_KEY = "paraglidelang"

/** The name of the cookie in which the language is stored */
export const LANG_COOKIE_NAME = "paraglidelang"

I'm using Svelte 5 and Vite Plugin Svelte in its next.7 version, so I'm not reporting a bug here, I know I can expect support for non stable releases. 

This is a side project, I'll dig deeper to find a fix (whether the right package versions to use to avoid it, or a suggestion for paraglide)

[samuelstroschein]

Hi @axel-rock,

I created an issue for the discussions opral/inlang-paraglide-js#235