/**
 * Binary search an array of numbers. The `lessThan` parameter determines which index
 * is returned:
 *
 *    true  - index of element less-than-or-equal to our search
 *    false -               .. greater-than-or-equal ..
 *
 * @public
 */
export declare const binarySearch: (elems: number[], lessThan: boolean, n: number) => number;