Unable to import typescript interfaces

[jnordberg]

Using this template with typescript I'm getting "name-is-not-exported-by-module" errors when trying to import interfaces from external modules. Was able to solve it by downgrading the rollup commonjs plugin as suggested in this issue: pyoner/svelte-typescript#23 Actually not, that was a red herring. Downgrading caused my build to hang indefinitely and a stale bundle was served making it look like it worked..

[benmccann]

Make sure to import type: https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-8.html#type-only-imports-and-exports

[jnordberg]

Thanks, that worked. When using the standard way of importing types in Vue et all it works fine. Is this a fundamental limitation of svelt or something that could be improved?

[benmccann]

I'm really not sure. I think type would be the preferred way to do it in either case, but it does seem funny that it works differently in Svelte

I think that this is related to https://github.com/sveltejs/svelte-preprocess. If you want to be a baller you could ask over in that repo why that is and then update the TypeScript FAQ: https://github.com/sveltejs/svelte/blob/master/site/content/faq/500-what-about-typescript-support.md