return when (fir) {
            is FirResolvedTypeRef -> fir.coneType.asKtType()
            is FirDelegatedConstructorCall -> fir.constructedTypeRef.coneType.asKtType()
            is FirTypeProjectionWithVariance -> {
                when (val typeRef = fir.typeRef) {
                    is FirResolvedTypeRef -> typeRef.coneType.asKtType()
                    else -> throwUnexpectedFirElementError(fir, ktTypeReference)