Gotcha

I can't remember how I chose the name.

It's just the bare bones of FP.

• Either
  • types: Either, Left, Right
  • constructors: left, right
  • type guards: isLeft, isRight
  • toEither: the [right, left] tuple, for use with promises (promise.then(...toEither))
• Option
  • types: Option, Some, None
  • constructors: some, none
  • type guards: isSome, isNone
  • singleton: NONE
• Error
  • toError: if something is not an Error, then wrap it in one
  • type ErrnoException — like NodeJS.ErrnoException, but with stronger typing of .code
  • isErrnoException: type guard for ErrnoException
• Throw
  • doThrow: throw, but as a function
  • doTryCatch: run a function, then turn its return value / thrown error into an Either

Imports can be done via @blaahaj/gotcha (for everything) or @blaahaj/gotcha/Either, etc.