If map.has() returns true than map.get should not be possibly undefined

[isidorn]

Typescript 3.3
Strict null checking turned on

if (map.has(key)) {
 map.get(key).attr   -> TS complains this might be null
}

TS shuold somehow undertsand that the key is in the map (which as value does not have undefined elements).

I searched for duplicates and could not find any.

[jack-williams]

Duplicate of #9619

[isidorn]

Yeah, it is a duplicate, closing. Thank you