ConfigToken
type ConfigToken<T> = intersectionIdentifies a top-level section of the resolved Flare config object with type info.
Created via flareConfig. Used with this.config(token) on FlareBase
subclasses and with the config resolver passed to inline handlers and builder callbacks.
The _type field is a phantom type: it exists only at compile time to carry the
TypeScript type T through the token so that this.config(token) can return T.
Learn: Configuration