services

type ProductCSVConversionService interface {
	ConvertToCSVFormat(product shopify.Product) []shopify.ProductCSV
}

type ProductsCSVWriterService interface {
	DownloadAllProducts(out io.Writer) error
	DownloadAllProductsUpdatingProgressState(out io.Writer, progressState chan<- progress.State) error
}

type ProductsRetrievalService interface {
	RetrieveAllProducts(chan<- shopify.Product) error
}