import { Base } from './abstract-base';
import { BoolUnit } from './bool-unit';
import { Stream } from './stream';
import { AsyncSystemBaseConfig, AsyncSystemStreamObservableProducer as StreamObservableProducer, AsyncSystemValue, UnitToValueType, Unit } from '../models';
/**
 * Base class for AsyncSystem.
 *
 * It can be used to create custom, {@link AsyncSystem} like Systems.
 *
 * See {@link https://docs.activejs.dev/fundamentals/systems/custom-asyncsystem} for more details.
 *
 * Just like every other ActiveJS construct:
 * - AsyncSystem extends {@link Base}
 * - Which further extends `Observable`
 *
 * @category 3. Systems
 */
export declare class AsyncSystemBase<QueryUnit extends Unit, DataUnit extends Unit, ErrorUnit extends Unit, Query extends UnitToValueType<QueryUnit> = UnitToValueType<QueryUnit>, Data extends UnitToValueType<DataUnit> = UnitToValueType<DataUnit>, Error extends UnitToValueType<ErrorUnit> = UnitToValueType<ErrorUnit>> extends Base<AsyncSystemValue<Query, Data, Error>> {
    /**
     * The member Unit that is intended to portray the role of `query` aspect of an async task.
     * @category Member Units
     */
    readonly queryUnit: QueryUnit;
    /**
     * The member Unit that is intended to portray the role of `response` aspect of an async task.
     * @category Member Units
     */
    readonly dataUnit: DataUnit;
    /**
     * The member Unit that is intended to portray the role of `error` aspect of an async task.
     * @category Member Units
     */
    readonly errorUnit: ErrorUnit;
    /**
     * The member Unit that is intended to portray the role of `pending-status` of an async task.
     * @category Member Units
     */
    readonly pendingUnit: BoolUnit;
    /**
     * Configured options. \
     * Combination of global-options {@link GlobalAsyncSystemConfig} and the options passed on instantiation.
     */
    readonly config: Readonly<AsyncSystemBaseConfig<Query, Data, Error>>;
    /**
     * @internal please do not use.
     *
     * It works because all our Subjects and operations are synchronous.
     */
    private relationshipsAutoPaused;
    private relationshipsManuallyPaused;
    /**
     * To check whether the inter-relationships among the member Units are active or not.
     *
     * @default `true`
     */
    get relationshipsWorking(): boolean;
    /**
     * @internal please do not use.
     */
    private unitsEmitCountsBeforePausing;
    /**
     * Combined value of all the member Units.
     *
     * @category Access Value
     */
    value(): AsyncSystemValue<Query, Data, Error>;
    constructor(
    /**
     * The member Unit that is intended to portray the role of `query` aspect of an async task.
     * @category Member Units
     */
    queryUnit: QueryUnit, 
    /**
     * The member Unit that is intended to portray the role of `response` aspect of an async task.
     * @category Member Units
     */
    dataUnit: DataUnit, 
    /**
     * The member Unit that is intended to portray the role of `error` aspect of an async task.
     * @category Member Units
     */
    errorUnit: ErrorUnit, 
    /**
     * The member Unit that is intended to portray the role of `pending-status` of an async task.
     * @category Member Units
     */
    pendingUnit: BoolUnit, config?: AsyncSystemBaseConfig<Query, Data, Error>);
    /**
     * A helper method that creates a stream by subscribing to the Observable returned by the param `observableProducer` callback.
     *
     * Ideally the callback function creates an Observable by applying `Observable.pipe`
     * on the {@link queryUnit} or `queryUnit.future$` as source Observable.
     *
     * Then, after a successful data flow, dispatch the data to the {@link dataUnit}; \
     * and after a failure, dispatch the error to the {@link errorUnit}, caught by using RxJS' catchError operator.
     *
     * Just know that you should catch the error in a sub-pipe (ie: do not let it propagate to the main-pipe), otherwise
     * as usual the stream will stop working, and will not react on any further emissions.
     *
     * @param observableProducer A callback function that should return an Observable.
     *
     * @category Common
     */
    createStream<R>(observableProducer: StreamObservableProducer<QueryUnit, DataUnit, ErrorUnit, R>): Stream;
    /**
     * To pause inter-relationships among the member Units. Also see {@link relationshipsWorking}.
     *
     * When inter-relationships are paused,
     * you can perform any number of operations on the member Units
     * without triggering the automatic relationships like {@link AsyncSystemBaseConfig.clearErrorOnData},
     * {@link AsyncSystemBaseConfig.autoUpdatePendingValue}, etc.
     *
     * This also means that the AsyncSystem stops emitting new values.
     *
     * @category Custom AsyncSystem
     */
    pauseRelationships(): void;
    /**
     * To resume inter-relationships among the member Units. Also see {@link relationshipsWorking}.
     *
     * It restores the inter-relationships like {@link AsyncSystemBaseConfig.clearErrorOnData},
     * {@link AsyncSystemBaseConfig.autoUpdatePendingValue}, etc.
     *
     * This also means that the AsyncSystem starts emitting new values. \
     * And if any of the member Units emitted a value while the relationships were paused,
     * the AsyncSystem will emit a new value immediately to bring itself and its subscribers in sync
     * with the member Units.
     *
     * @category Custom AsyncSystem
     */
    resumeRelationships(): void;
    /**
     * @internal please do not use.
     */
    private unitsEmitCounts;
    /**
     * @internal please do not use.
     */
    private createRelationshipsAmongMemberUnits;
    /**
     * @internal please do not use.
     */
    private executeQueryUnitRelationship;
    /**
     * @internal please do not use.
     */
    private executeDataUnitRelationship;
    /**
     * @internal please do not use.
     */
    private executeErrorUnitRelationship;
    /**
     * @internal please do not use.
     */
    private toggleQueryUnitFreezeMaybe;
    /**
     * @internal please do not use.
     */
    private autoUpdatePendingValue;
    /**
     * @internal please do not use.
     */
    protected emit(value?: AsyncSystemValue<Query, Data, Error>): void;
    /**
     * @internal please do not use.
     */
    private combinedEmittedValues;
}