/**
 * .what = derive hook time from block duration minus child durations
 * .why = neither jest nor vitest expose individual hook durations
 *
 * note
 * - hook duration includes beforeAll, afterAll, beforeEach, afterEach time
 * - returns 0 when result would be negative (time variance can cause slight negatives)
 */
export declare const computeHookDuration: (input: {
    blockDuration: number;
    childDurations: number[];
}) => number;