Fusing Svelte and RxJS with simple actions and pipeable stores.
Learn more: https://svelte-fuse-rx.netlify.app/
Mostly copied from Ben Lesh's implementation here: https://github.com/ReactiveX/rxjs/issues/4740#issuecomment-490601347
https://svelte.school/tutorials/external-libraries-in-svelte-and-sapper-using-actions
Adapted from Nick McMillan: https://codepen.io/hey-nick/pen/KVWvJv