/**
 * Keep/drop modifier implementations for dice pools.
 *
 * @module evaluator/modifiers/keep-drop
 */
import type { DieResult, KeepDropSpec } from '../../types.js';
/**
 * Records into `droppedMask` every pool slot that `kind` / `selector` /
 * `count` drops.
 *
 * Nothing is cloned and no flag is written. The caller owns the merge, so a
 * chain like `4d6kh3dl1` runs one pass per spec over the same mask and then
 * rewrites each die's slot flags exactly once — where the previous
 * clone-per-spec appliers rebuilt the whole pool for every spec only to have
 * their flags read back and discarded.
 *
 * Dice already carrying `'dropped'` (reroll intermediates, meta dice, a
 * preceding chain's losers) are ineligible for selection and stay dropped.
 */
export declare function markDroppedIndices(dice: DieResult[], count: number, kind: KeepDropSpec['kind'], selector: KeepDropSpec['selector'], droppedMask: Uint8Array, hasVersusDc: boolean): void;
/**
 * Sums the dice a keep/drop pass left standing.
 *
 * @param hasVersusDc - Shared env flag; skips the DC exclusion when no `vs` has
 *   tagged anything
 */
export declare function sumKeptDice(dice: DieResult[], hasVersusDc: boolean): number;
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