$_badClassNameA
$_badClassNameA : string|null
Name of the first class involved in the circular map.
Means that there is a circular reference in the property map's imports.
Examples: B extends A, B imports A (which is impossible since no class
extends are allowed to import any part of their own inheritance tree), or
AB[C] imports ABC[D] (which is impossible, since D relies on C which is
not yet done being compiled, since C is currently trying to import D to
resolve itself), or X imports Y, Y imports X (where two otherwise-unrelated
classes are trying to import each other, which is an unresolvable circular
reference where neither class can finish their compilation, since they both
depend on each other).