Unexpected token error in REPL but not locally

[janosh]

Describe the bug

svelte-multiselect stopped working in the REPL in v5.0.0. The previous v4.0.6 release is working fine.

The error message v5 raises is: Unexpected token (Note that you need plugins to import files that are not JavaScript)

Sadly the REPL gives no stack traces. I've been looking through the changes I introduced between these 2 releases but nothing jumps out. v5 works fine when used locally too. I was also looking through the REPL compiler's JS output but couldn't spot any issues. Any debugging advice would be great.

Reproduction

v:4.0.6 (working): https://svelte.dev/repl/4279890dae0942caa860e74f2e7a8a6f?version=3.48.0
v5.0.0 (broken): https://svelte.dev/repl/ea202bd627134d898802a11cfaf8ff0e?version=3.48.0

Logs

No response

System Info

REPL

Severity

annoyance

[janosh]

Error originally reported in janosh/svelte-multiselect#80.

[baseballyama]

I think this is because of this change.

https://github.com/janosh/svelte-multiselect/pull/75/files#diff-7d86c55b55f23806b2be4051d790e7c775fd5fa4e1ad3fc2da59eb51ce25c0e9R3
(Important point is thattype has been removed)

I took diff between 4.0.6 and 5.0.0.
(Left side is 4.0.6, the right side is 5.0.0)

And due to import './';, REPL fetches data from https://unpkg.com/browse/svelte-multiselect@5.0.0/ but it returns HTML and REPL throw parse error because it expects JavaScript.

[Conduitry]

Transferring this to the sites repo, as this is apparently an issue in how the REPL resolves imports, not in Svelte itself.

[janosh]

@baseballyama I thought that strange remnant from the type import might be the issue too at first but later v5 releases of svelte-multiselect don't have that any more. The generated package/MultiSelect.svelte looks like this now but the REPL import still fails.

<script>import { createEventDispatcher } from 'svelte';
import { get_label, get_value } from './';
import CircleSpinner from './CircleSpinner.svelte';
// ...

[gyurielf]

Same here:
https://svelte.dev/repl/0a87b0b710ab473fb7368dc260160ae6?version=3.50.1
It works fine outside of the REPL.

[janosh]

Just noticed that version 7.0.2 of svelte-multiselect now successfully runs in the Svelte REPL.

@gyurielf Apparently the fix was to remove a circular import between src/lib/{index.ts<->MultiSelect.svelte}. See janosh/svelte-multiselect#121 (comment).

@Conduitry Maybe this also helps point at how to make the REPL more robust?