import { Observer, SubscriptionOptions } from "../../utils/observable";
import { Point } from "../../utils/misc";
export type DestinationZoomUpdate = {
    type: 'destination';
    destination: number;
    anchor?: Point;
};
export type DeltaZoomUpdate = {
    type: 'delta';
    delta: number;
    anchor?: Point;
};
export type ZoomUpdate = {
    anchorCoordinateSystem: 'world' | 'viewport';
    update: DestinationZoomUpdate | DeltaZoomUpdate;
};
export declare class CameraZoomUpdateBatcher {
    private nextZoom;
    private observable;
    private anchor;
    private delta;
    private anchorCoordinateSystem;
    private queueZoomUpdateCount;
    private queueZoomUpdateToCount;
    private lastUpdateCount;
    constructor();
    /**
     * Queue a zoom update to a specific destination to be processed in the next animation frame
     */
    queueZoomUpdateTo(destination: number, anchor?: Point): void;
    /**
     * Queue a zoom update by delta to be processed in the next animation frame
     */
    queueZoomUpdateBy(delta: number, anchor?: Point): void;
    /**
     * Queue a zoom update by delta at a world anchor to be processed in the next animation frame
     */
    queueZoomByAtWorld(delta: number, worldAnchor: Point): void;
    /**
     * Queue a zoom update to a specific destination at a world anchor to be processed in the next animation frame
     */
    queueZoomToAtWorld(destination: number, worldAnchor: Point): void;
    /**
     * Process and clear all queued zoom updates
     * @returns the update to apply to the zoom level, with type information
     */
    processQueuedUpdates(): ZoomUpdate | null;
    /**
     * Subscribe to zoom updates
     */
    subscribe(observer: Observer<[ZoomUpdate]>, options?: SubscriptionOptions): () => void;
    /**
     * Get debug information about queue method calls since last update
     */
    getDebugInfo(): {
        lastUpdateTotalCalls: number;
        queueZoomUpdateCalls: number;
        queueZoomUpdateToCalls: number;
    };
}