/**
 * The id value, within a reference
 * @private
 */
export interface RefId<S> {
    __do_not_use_this_refid: S;
}
/**
 * The type value, within a reference
 * @private
 */
export interface RefType<T> {
    __do_not_use_this_reftype: T;
}
/**
 * A reference to an entity in a registry
 * @public
 */
export declare type Ref<K, S extends {} = string> = [RefType<K>, RefId<S>];
/**
 * Get a reference type for a registry
 * @public
 */
export declare type RefFor<RefRegistry, K extends keyof RefRegistry> = RefRegistry[K];
/**
 * Get the names of types present in a RefRegistry
 * @public
 */
export declare type RefTypes<RefRegistry> = keyof RefRegistry;
/**
 * Any reference possible for a given RefRegistry
 * @public
 */
export declare type AnyRef<RefRegistry> = RefRegistry[RefTypes<RefRegistry>];
/**
 * Check to see whether a value is a reference
 * @param thing value to check
 * @public
 */
export declare function isRef<R extends Ref<any>>(thing?: R): thing is R;
export declare function isRef<K extends string>(thing: any, refTyp: K): thing is Ref<K>;
/**
 * Create a new reference
 * @param type name of the reference type
 * @param id registry-unique of the reference
 * @returns the new reference
 * @public
 */
export declare function createRef<RefRegistry, K extends RefTypes<RefRegistry>>(type: K, id: string): Ref<K>;
/**
 * Get a reference's type name
 * @param ref the reference
 * @public
 */
export declare function refType<K>(ref: Ref<K, any>): K;
/**
 * Get a reference's ID
 * @param ref the reference
 * @public
 */
export declare function refId<S extends {}>(ref: Ref<any, S>): S;
/**
 * A function that turns a reference into a resolved entity
 * @public
 */
export declare type RefResolver<EntityMap> = <K extends keyof EntityMap>(ref?: Ref<K>) => EntityMap[K] | undefined;
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