export interface DfPanZoomBounds {
    readonly minX: number;
    readonly minY: number;
    readonly maxX: number;
    readonly maxY: number;
}
export interface DfPanZoomTrackedBounds extends DfPanZoomBounds {
    readonly id: string;
}
export declare class PanZoomBoundsTracker<T extends DfPanZoomBounds = DfPanZoomTrackedBounds> {
    private readonly items;
    private bounds;
    private boundaryItems;
    has(item: T): boolean;
    add(item: T): void;
    update(item: T, nextBounds: Partial<T>): void;
    remove(item: T): void;
    clear(): void;
    toJSON(): DfPanZoomBounds & {
        length: number;
    };
    private updateBoundsIncremental;
    private recalculateBounds;
    private isOnBoundary;
    private removeFromBoundaryTracking;
    private needsRecalculation;
    private hasValidBounds;
}