Add "type": "module" to package.json

[benmccann]

Svelte libraries should generally contain "type": "module" in package.json`

Probably the hardest part would be dealing with the tests. They should be migrated to ESM. If you upgrade to the latest version of svelte-jester it will only support ESM. The svelte-jester README will describe how to set this up. Alternatively, vitest could be used

[dysfunc]

@benmccann I was wondering if you wouldn't mind joining our slack https://join.slack.com/t/sveltestrap/shared_invite/zt-28y9c8a8k-6~9UI~26Cx7pF1JKeQZPyA. I had something I wanted to run by you/review for an upcoming release.

[benmccann]

I'm not sure if I'll have a chance to jump on Slack, but you can find me on Discord here: https://svelte.dev/chat. I have the same username there and on GitHub