** (Service) - Contribute to set application default '@Config' values, overriding any factory defaults.
**
** pre>
** syntax: fantom
**
** const class AppModule {
**
** @Contribute { serviceType=ApplicationDefaults# }
** Void contributeApplicationDefaults(Configuration config) {
** config["config.id"] = "Config Value"
** }
** <pre
**
** Config values can be any immutable value.
**
** @uses Configuration of 'Str:Obj' of IDs to Objs. Obj values must be immutable.
@Js
const mixin ApplicationDefaults : ConfigProvider {
@NoDoc
override abstract Str:Obj? config()
}
@Js
internal const class ApplicationDefaultsImpl : ApplicationDefaults {
override const Str:Obj? config
new make(Str:Obj? config) {
this.config = config.toImmutable
}
}