Typescript Classes compiles reactive variables into illegal state#15852

### Describe the bug In Svelte 5, we can use reactive variables in classes. You can also create 'reactive' files (`example.svelte.js`). Combining these two ideas also works fine. However, when I do the same thing in Typescript, it compiles into a broken state. ### Reproduction In file: `+page.svelte`: ``` <script> <!-- OR: <script lang="ts"> --> import { test } from './test.svelte'; </script> ``` In file `test.svelte.ts`: ``` class Test { something = $state() } export const test = new Test(); ``` *Note*: It works fine doing the same with a JS file (`text.svelte.js`) ### Logs ```shell 11:21:10 [vite] Internal server error: src/routes/test.svelte.ts:3:21 `$state(...)` can only be used as a variable declaration initializer or a class field https://svelte.dev/e/state_invalid_placement Plugin: vite-plugin-svelte-module File: src/routes/test.svelte.ts:2:16 1 | class Test { 2 | constructor() { 3 | this.something = $state(); ^ 4 | } 5 | } ``` ### System Info ```shell System: OS: Linux 6.8 Ubuntu 24.04.2 LTS 24.04.2 LTS (Noble Numbat) CPU: (16) x64 12th Gen Intel(R) Core(TM) i5-1240P Memory: 3.42 GB / 15.32 GB Container: Yes Shell: 5.2.21 - /bin/bash Binaries: Node: 22.14.0 - ~/.nvm/versions/node/v22.14.0/bin/node npm: 10.9.2 - ~/.nvm/versions/node/v22.14.0/bin/npm Browsers: Chrome: 128.0.6613.119 npmPackages: svelte: ^5.28.2 => 5.28.2 ``` ### Severity annoyance