import { Subscription, BehaviorSubject } from 'rxjs';
import { ProcessLifecycleCallbacks } from '@rxfx/service';
type UseServiceOptions = {
    /** What to do when component unmounts */
    unmount?: 'cancelCurrent' | 'cancelCurrentAndQueued';
};
/** Only the bits of Service that useService actually needs */
export interface UsableAsService<TRequest, TState, TError, TNext = unknown> {
    /** fire off a request */
    request(req: TRequest): void;
    /** cancel only the in-flight request */
    cancelCurrent(): void;
    /** cancel in-flight + queued requests */
    cancelCurrentAndQueued(): void;
    /** the current value + subscription */
    state: BehaviorSubject<TState>;
    /** whether any handler is active */
    isActive: BehaviorSubject<boolean>;
    /** last error or null */
    currentError: BehaviorSubject<TError | null>;
    /** allows callbacks to be run upon ProcessLifecycleEvents */
    observe(cbs: Partial<ProcessLifecycleCallbacks<TRequest, TNext, TError>>): Subscription;
}
/** Provides updates to state, isActive, and currentError populated from the service.
 * Allows requesting of the service via `request`. Optionally cancels requests on unmount.
 * Works with both Services and Effects.
 * @param service - The service to connect to
 * @param options - Configuration including unmount behavior
 * @returns An object with fields to access the state and status of the Service/Effect
 */
export declare function useService<TRequest, TState, TError>(service: UsableAsService<TRequest, TState, TError, unknown>, options?: UseServiceOptions): {
    state: TState;
    request: (req: TRequest) => void;
    isActive: boolean;
    isLoading: boolean;
    currentError: TError | null;
};
/** Alias for useService, for working with an @rxfx/effect
 * @see useService
 */
export declare function useFx<TRequest, TState, TError, TNext = unknown>(service: UsableAsService<TRequest, TState, TError, TNext>, options?: UseServiceOptions): {
    state: TState;
    request: (req: TRequest) => void;
    isActive: boolean;
    isLoading: boolean;
    currentError: TError | null;
};
export {};