ConfigProvider.fromYamlFile Is Not Sufficiently Lazy

[adamgfraser]

The following application will throw an exception:

import zio.ConfigProvider
import zio.config.yaml._

import java.io.File

object Example extends App {

  val file = new File("???")

  val configProvider =
    ConfigProvider.fromYamlFile(file)
}

This should not occur because the ConfigProvider should be something that knows how to load a given configuration but should not actually do so until requested to by a ZIO application. The current behavior makes it impossible to recover from these types of errors using operators such as ConfigProvider#orElse or even for the ZIO runtime to properly manage them since they occur when the ConfigProvider is defined.

Note that ConfigProvider.fromHoconFile already handles this properly.

[afsalthaj]

I will take a look