import { ActivationContext } from "./ActivationContext";
import { Descriptor, PartialServiceMap, TypeOfService, ContainerKeys } from "./interfaces";
export interface ReferenceDescriptorParams<S extends object, K extends ContainerKeys<S>> {
    /**
     * The name of the descriptor
     */
    name: K;
    /**
     * The flag that indicates that the referenced service isn't required to exist.
     * If the reference is optional and the referenced service doesn't exist,
     * the undefined or a default value will be returned.
     */
    optional?: boolean;
    /**
     * a default value for the reference when the referenced service doesn't exist.
     */
    default?: TypeOfService<S, K>;
    /**
     * The service overrides
     */
    services?: PartialServiceMap<S>;
}
export declare class ReferenceDescriptor<S extends object = any, K extends ContainerKeys<S> = ContainerKeys<S>> implements Descriptor<S, TypeOfService<S, K>> {
    _name: K;
    _optional: boolean;
    _default: TypeOfService<S, K> | undefined;
    _services: PartialServiceMap<S>;
    constructor(opts: ReferenceDescriptorParams<S, K>);
    /** This method activates the referenced service if one exists
     * @param context activation context which is used during current activation
     */
    activate(context: ActivationContext<S>): any;
    toString(): string;
}