checkNestMappingReturnNullable function
Implementation
checkNestMappingReturnNullable(MethodElement method, bool inputNullable) {
final returnIsNullable = (inputNullable &&
method.parameters.first.type.nullabilitySuffix !=
NullabilitySuffix.question) ||
(inputNullable &&
method.returnType.nullabilitySuffix == NullabilitySuffix.question);
return returnIsNullable;
}