export interface ClientPos {
    clientX: number;
    clientY: number;
}
export interface ArrayLike<T> {
    readonly length: number;
    [index: number]: T;
}
export declare function average(touches: ArrayLike<ClientPos>): ClientPos;
export declare function distance(a: ClientPos, b: ClientPos): number;
/**
 * Passing the midpoint and two points will yield the same result as distance between those two,
 * so this is an extension of the usual panzoom approach that should work with any number
 * of contact points.
 */
export declare function totalDistance(center: ClientPos, others: ArrayLike<ClientPos>): number;
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