TypeScript support

[guybedford]

It would be great to support input sources as TypeScript directly that then get converted into JavaScript before running through componentization.

[rajsite]

Guessing it's what you have in mind but probably following node's --experimental-strip-types and --experimental-transform-types implementation and even using swc like deno and node.

[vados-cosmonic]

Should we close #4 in favor of this one? seems like we've got a little more information in here.