Existential Operator / Null Propagation Operator

[Tingan Ho]

One thing to keep in mind is that with prefix operator `?a.b` will also let
people move back and forth with their caret. Since most people type the
identifier first and then the operator. So they type `a` first and the move
the caret in front of `a` and type `?` and then move the caret back to the
last position and then type `.b`. This has been a big problem in typing
type assertions in TS which had a prefix operator. They later introduced
the `as` operator which is a postfix operator.

What about `a!?.b` since semantically the symbol `!` has a meaning of
non-nullable in JSDoc[1]. So the semantics of  `a!?.` is `is it not null
then the accessor ...`.

Or just `a!.b`?

[1]: Non-nullable type — http://usejsdoc.org/tags-type.html

-- 
Sincerely,

Tingan Ho
@tingan87 <https://twitter.com/tingan87>
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