Multiple implementations about fx HOT 3 OPEN

The easiest way to achieve this is by using a flag that can be obtained through configuration or a command-line argument.

fx.New(
	fx.Provide(
		func() string {
			var country string
			// parse config
			return country
		},
	),
	fx.Provide(
		func(country string) CountryInterface {
			switch country {
			case "us":
				return NewUS()
			case "uk":
				return NewUK()
			default:
				return NewDefault()
			}
		},
	),
)

It is also recommended not to use plain strings for representing the country value in fx. Instead, it's better to use a separate custom type or use name tag

from fx.

That's right, but it is not we want to do.
If we have multiple implementations of multiple types we will end up with switch cases everywhere :(

from fx.

Hi! Temporarily, we resolved the request with the following approach.

And perform some validations.

from fx.