Running into an issue while using esbuild-svelte and svelte-preprocess with svelte 5

[christophertrudel]

Describe the bug

[ERROR] [svelte-preprocess] Encountered type error [plugin esbuild-svelte]

    node_modules/runed/dist/utilities/debounced/index.js:1:14:
      1 │ export * from "./debounced.svelte.js";
        ╵               ~~~~~~~~~~~~~~~~~~~~~~~

To Reproduce
Using shadcn-svelte with live_svelte and when running the server esbuild fails with the described error. I have narrowed it down to debounced.svelte.js which contains a comment that references

<script lang="ts">

This seems to be the trigger of the issue that is likely not being properly handled in svelte-preprocess. I have created a patch package to unblock but wanted to report to see if anybody has any idea where the root cause might be?

patch:

diff --git a/node_modules/runed/dist/utilities/debounced/debounced.svelte.js b/node_modules/runed/dist/utilities/debounced/debounced.svelte.js
index c8175e7..c541c4b 100644
--- a/node_modules/runed/dist/utilities/debounced/debounced.svelte.js
+++ b/node_modules/runed/dist/utilities/debounced/debounced.svelte.js
@@ -12,7 +12,7 @@ import { noop } from "../../internal/utils/function.js";
  *
  * @example
  *
- * <script lang="ts">
+ * <script>
  *   import { Debounced } from "runed";
  *
  *   let search = $state("");

Information about your project:

System:
OS: macOS 15.1.1
CPU: (12) arm64 Apple M3 Pro
Memory: 94.34 MB / 36.00 GB
Shell: 5.9 - /bin/zsh
Binaries:
Node: 22.11.0 - ~/.nvm/versions/node/v22.11.0/bin/node
npm: 10.9.0 - ~/.nvm/versions/node/v22.11.0/bin/npm
pnpm: 10.9.0 - /opt/homebrew/bin/pnpm
bun: 1.2.10 - /opt/homebrew/bin/bun
Browsers:
Brave Browser: 119.1.60.114
Chrome: 135.0.7049.97
Safari: 18.1.1
npmPackages:
svelte: ^5.28.2 => 5.28.2
svelte-preprocess: ^6.0.3 => 6.0.3