Export TypeScript instead of JS

[seperman]

Currently the NextJS exporter, exports JS instead of TS.
TypeScript is also not essential for functionality, but it would give us better code quality, fewer runtime errors, and easier maintenance as the number of components exported grows.

[paulbrie]

Hi! Thanks for reaching out. We plan to add a version selector for the export but don't have an ETA yet. Are you doing some custom work directly with our generators?

[seperman]

@paulbrie cool. No custom work yet.