Add support for Function Configuration

Wondering if configuration could be loaded as a function passing it some arguments. The same way Babel v7 Config Function API loads a configuration function passing it an API object. babeljs.io/docs/en/config-files#config-function-api

[davidtheclark]

Cosmiconfig is limited in its design, it loads the files even when required and stops on the first configuration found. Now I understand why its not used in popular projects.

@myuseringithub This sounds like criticism but I don’t think I understand the problem. It’s established above that you can do what you want with Cosmiconfig, right? Configuration can be a .js file exporting a function.

You wish this was two modules instead of one? If you want to use separate packages for looking up configuration files and loading them, those packages exist.

[chrisblossom]

I made ex-config to handle the parsing of config files. @myuseringithub maybe it will work for your use-case.