Making subclassing more flexible

[taylorswift]

@davdroman

The only other realistic workaround is using @_spi, which is exactly what the introduction of package was trying to improve upon:

// Module: Base

open class Base {
    @_spi(package) open func printMessage() {
        print("Hello!")
    }
}

mind your telephone grip

package is not a replacement for @_spi and proponents of the keyword didn’t conceive of it as such when it was first being pitched.

i think you are not getting as much out of your @_spi attributes as you could because you are creating a project-wide namespace @_spi(package) which is basically what the package keyword was meant to prevent. the s in @_spi stands for system programming interface, you should have one for each system in your project, like @_spi(messages) for printMessage.