export interface MorphMeasures {
    [key: string]: {
        x: number;
        y: number;
    };
}
export declare function measure(element: HTMLElement): MorphMeasures;
export declare function computeDelta(prev: MorphMeasures, current: MorphMeasures, key: string): {
    dx: number;
    dy: number;
};
/** Nearest persisting neighbour by ID, searching backward first, then forward. */
export declare function findNearestAnchor(targetIndex: number, ids: string[], persistentIds: Set<string>, direction?: 'backward-first' | 'forward-first'): string | null;
export declare function resolveExitingAnchors(oldChildren: HTMLElement[], exiting: Set<HTMLElement>, oldIds: string[], newIds: Set<string>): Map<HTMLElement, string | null>;