Consider using target: esnext

[fregante]

From what I understand, target: esnext will avoid most code transforms by tsc, outputting exactly what the user authored. This is in a way similar to #29

In full-typescript projects this means that by default what you write is what you get, avoiding unwanted and often unnecessary code transforms. I think a lot of people don’t understand that “tsc acts like babel-preset” so probably this shouldn’t be the default behavior.

The advantages for this package are:

• fewer majors required here
• updates of this package won’t necessarily change my project’s compatibility/output

I haven’t decided what lib should be set to but that can be discussed separately, it’s fine as is.