isExternalTypeName method
can be any thing with/without nullability sign.
can be functional type or alias type name or ...
Implementation
bool isExternalTypeName() {
if (isEmpty || trim() != this || '?' == this) return false;
return true;
}
can be any thing with/without nullability sign.
can be functional type or alias type name or ...
bool isExternalTypeName() {
if (isEmpty || trim() != this || '?' == this) return false;
return true;
}