Vscode extension compile button doesn't work with async svelte

[hanielu]

Describe the bug

When using async svelte, clicking on the Svelte: Show Compiled Code doesn't show the correct compiled output, I get this error on the extension host output

Reproduction

Try clicking this button

when on a svelte file with this code

<script lang="ts">
	const wait = (ms: number) => new Promise((res) => setTimeout(() => res("Hey"), ms));
	const result = await wait(1000);
</script>

{result}

Expected behaviour

I expect the compiled output to show and be correct

System Info

System:
OS: macOS 26.0
CPU: (12) arm64 Apple M2 Max

IDE: VSCode

Which package is the issue about?

Svelte for VS Code extension

Additional Information, eg. Screenshots

No response