/**
 * Bounce odds — the "birthday problem" for bouncing damage dice (e.g. Chromatic
 * Orb): the probability that at least two of K dice with S faces show the same
 * value, which is what lets the spell jump to another target.
 *
 * Accounts for two modifiers:
 * - **Elemental Adept** (`minimumDieRoll >= 2`): rolls below the minimum are
 *   bumped up to it, collapsing the low faces onto a single heavier value.
 * - **Empowered Spell** (`rerollDamageDice > 0`): a number of dice may be
 *   rerolled once, giving a second chance at a match.
 *
 * The base and Elemental-Adept cases are computed exactly (see
 * {@link pAllDistinct}); the Empowered-Spell reroll is an explicit model layered
 * on the exact base match probability.
 */
/** Options that modify bounce odds via metamagic / feats. */
export interface BounceOddsOptions {
    /** Minimum die roll — e.g. 2 for Elemental Adept, 3 for Great Weapon Fighting 2024. */
    minimumDieRoll?: number;
    /** Number of dice that may be rerolled once — e.g. CHA modifier for Empowered Spell. */
    rerollDamageDice?: number;
}
/**
 * P(at least two of `diceCount` dice with `dieFaces` faces match), honoring
 * Elemental Adept and Empowered Spell. Returns a probability in [0, 1].
 *
 * @param diceCount Number of dice rolled.
 * @param dieFaces Faces per die (e.g. 8 for d8).
 * @param options Optional metamagic / feat modifiers.
 */
export declare function calculateBounceOdds(diceCount: number, dieFaces: number, options?: BounceOddsOptions): number;
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