fix(types): es6 output format is deprecated

[bitjson]

Error: The es6 output format is deprecated – use es instead

[lukastaegert]

Definitely, thanks!

[lukastaegert]

Actually you should be using esm instead of es which we added to align with how this format is referenced in many other places. The ultimate plan is to deprecate es as well at some point. I guess there is no harm in deprecating es in the types now?

[bitjson]

Good to know. I'd recommend making that change in the same PR which changes the error message and documentation. (In the docs, I don't see esm mentioned?)

[lukastaegert]

In the docs, I don't see esm mentioned?

Good point, will need to take a look.

[lukastaegert]

Docs PR: rollup/rollupjs.org#143

[guybedford]

Probably sensible to leave both es and esm for now?

[lukastaegert]

I vote for removing "es" it from the types but leaving it in the code. Thus everything will still work but TS users will be notified to change it. Then maybe in the 1.0.0, we can display a warning if "es" is used instead of "esm".