Svelte TypeScript: Jest hangs when run

[ryands17]

On scaffolding a project from @snowpack/app-template-svelte-typescript and running yarn test, Jest hangs indefinetly.

To reproduce:

1. Scaffold a project from the above template and run npm test or yarn test.

[drwpow]

I’m seeing the same thing, but I believe the issue is in jest-transform-svelte: rspieker/jest-transform-svelte#18

I’m seeing tests hang even if I’m using a manual Jest configuration, and not extending app-scripts-svelte at all.

[drwpow]

Started another discussion here, with improvements to the setup welcome: #753