import { HRef, HDict, HGrid } from 'haystack-core';
import { Subject, SubjectChangedEventHandler } from './Subject';
/**
 * A watch subject that batches calls together.
 *
 * This is used to batch calls together. For instance, let's say 10 watches
 * simulatenously watch some records. It would be good to batch this up into one network call.
 */
export declare class BatchSubject implements Subject {
    #private;
    /**
     * Constructs a new batch subject.
     *
     * @param subject The subject to wrap.
     */
    constructor(subject: Subject);
    /**
     * @returns The display name of the subject.
     */
    get display(): string;
    /**
     * @returns The subject's poll rate.
     */
    get pollRate(): number;
    /**
     * Set the poll rate.
     *
     * @param pollRate
     */
    set pollRate(pollRate: number);
    /**
     * Refresh the subject's data.
     */
    refresh(): Promise<void>;
    /**
     * Add records to observe.
     *
     * @param ids The ids to add.
     */
    add(ids: string[]): Promise<void>;
    /**
     * Remove records from the subject.
     *
     * This is called to stop observing records.
     *
     * @param ids The ids to remove.
     */
    remove(ids: string[]): Promise<void>;
    /**
     * Invoke a batch operation.
     *
     * @param op The name of the op.
     * @param ids The ids used in the batch operation.
     */
    private batchInvoke;
    /**
     * Queue the batch operation to be invoked.
     *
     * @param op The name of the op.
     * @param ids The ids used in the batch operation.
     * @param deferred The deferred promise for this asynchronous operation.
     */
    private queueBatchOp;
    /**
     * Clear the existing batch timer.
     */
    private clearBatchTimer;
    /**
     * Start a new batch timer.
     */
    private startBatchTimer;
    /**
     * Register a callback for changed events.
     *
     * @param callback The callback used for changed events.
     */
    on(callback: SubjectChangedEventHandler): void;
    /**
     * Unregister the callback for changed events.
     *
     * @param callback The callback used for changed events.
     */
    off(callback: SubjectChangedEventHandler): void;
    /**
     * Return a record via its id or undefined if it can't be found.
     *
     * @param id The id to record to get.
     * @returns The dict or undefined if it can't be found.
     */
    get(id: string | HRef): HDict | undefined;
    /**
     * Used to manually trigger a watch update.
     *
     * @param grid A grid of dicts to update.
     */
    update(grid: HGrid): Promise<void>;
    /**
     * Inspect the subject.
     */
    inspect(): void;
}