JS Parse Error for valid typescript

[jhwz]

Describe the bug

It seems when you have an expression in svelte component of the form <variable> as something ||= <expr> svelte is throwing

Assigning to rvalue
https://svelte.dev/e/js_parse_error

Reproduction

https://svelte.dev/playground/dad6fe4d3b7343f0ae6f5edba84c2a6b?version=5.21.0

Logs

System Info

NA

Severity

annoyance

[Conduitry]

@dummdidumm Is this a bug you've already fixed in the acorn-typescript fork, and we just need to actually switch over to that? Or is this a new one?

[paoloricciuti]

@dummdidumm Is this a bug you've already fixed in the acorn-typescript fork, and we just need to actually switch over to that? Or is this a new one?

https://svelte.dev/playground/dad6fe4d3b7343f0ae6f5edba84c2a6b?version=pr-15393

Nope but i assume we should fix it there