Output fp-ts style Task/TaskEither from tryit

[stefaanMLB]

I got stuck in an attempt to write a fluent (entension method) function to work on the [error, result] output of tryit because it seems not possible in typescript to write extension methods on tuples.
Would it not be better to use the Either/TaskEither approach of fp-ts to store the result state instead of tuples ? That way it will be easier to extend it with fluent stype APIs.