Support more than one generic argument.

[bakhtiyarneyman]

Great library! It'd be even more useful if it supported Haskell's Either type.

[twop]

Thanks!
When I started the work of supporting generics I explicitly made the syntax compatible with 2 generic arguments.

// here what I envisioned
const Either = Union((a, b) => ({
  Right: of(a),
  Left: of(b)
}))

But at the time I didn't need it enough to justify the type mess this would cause.

But I did have an idea how to make the result type useful:
https://github.com/twop/ts-definitely-maybe/blob/master/src/result.ts

The gist of it is to bake one type argument at a time. Which is probably ok for result but less so for either.

Hope that helps + I'm open to discuss this more.