import { ResourceOptions, ResourceRef } from "@angular/core";
export declare function $resource<T, R>(options: ResourceOptions<T, R> & {
    saver?: (param: T | undefined) => void | PromiseLike<void>;
    defaultValue: NoInfer<T>;
}): ResourceRef<T>;
export declare function $resource<T, R>(options: ResourceOptions<T, R> & {
    saver?: (param: T | undefined) => void | PromiseLike<void>;
}): ResourceRef<T | undefined>;