Any idea why I didn't get a compile error there? The

fetchSaleWithPhotosById

returns a

Flow<SaleEntity?>

instead of a List, however it still compiles.

override fun read(key: SalesRequestKey): Flow<List<Sale>> = flow {
        when (key) {
            SalesRequestKey.AllSales -> emitAll(
                salesLocalDataSource.fetchAllSales()
                    .map { saleEntities -> saleEntities.map(saleEntityToDomainSaleEntityMapper) }
            )
            is SalesRequestKey.SingleSaleRequest -> emitAll(
                salesLocalDataSource.fetchSaleWithPhotosById(
                    key.saleId
                ).filterNotNull()
                    .map { saleEntity -> saleEntityToDomainSaleEntityMapper.invoke(saleEntity) }
            )
    }

Does the

saleEntityToDomainSaleEntityMapper.invoke

return

List<Sale>

?

Nope, that's the signature in the ctor

private val saleEntityToDomainSaleEntityMapper:
Mapper<@JvmSuppressWildcards SaleEntity, @JvmSuppressWildcards Sale>