/**
 * How a played double must be answered before play continues.
 * - `none`: doubles are ordinary tiles.
 * - `cover`: the double must be answered by one tile on its open end.
 * - `chicken-foot`: the double must grow a full foot (`chickenFoot.toeCount`
 *   answers: the straight center continuation plus the angled side toes).
 */
export type DoubleObligation = 'none' | 'cover' | 'chicken-foot';
export interface ChickenFootConfig {
    /**
     * Total toes a double must grow to be satisfied, counting the straight center
     * continuation as one. Stays 3 by default (center + two ±angle side toes).
     */
    toeCount: number;
    /** Angles (degrees, relative to the train) of the side toes (toeCount - 1). */
    sideToeAngles: number[];
}
/**
 * Every knob that governs legal play. Pass a partial override to {@link resolveRules}
 * to get a fully-populated config; unspecified fields fall back to DEFAULT_RULES.
 */
export interface RulesConfig {
    /** Highest pip value in the set (12 → double-12, 18 → double-18, 91 / 190 tiles). */
    maxPips: number;
    /** Value of the starting engine double (defaults to maxPips). */
    engineValue: number;
    /** Forbid a double immediately following a double in a chain. */
    allowConsecutiveDoubles: boolean;
    /** Each physical tile may be placed at most once across all play. */
    requireUniqueTiles: boolean;
    /** A tile may only attach where one of its ends matches the open value. */
    requireSequential: boolean;
    /** Obligation imposed by playing a double. */
    doubleObligation: DoubleObligation;
    chickenFoot: ChickenFootConfig;
}
export declare const DEFAULT_RULES: RulesConfig;
/** Number of answers a double needs to be satisfied under the given rules. */
export declare function requiredDoubleAnswers(config: RulesConfig): number;
/** Number of angled side-toe slots a double exposes (center is the main line). */
export declare function sideToeSlots(config: RulesConfig): number;
/** Fills in any missing fields from DEFAULT_RULES (engineValue tracks maxPips). */
export declare function resolveRules(overrides?: Partial<RulesConfig>): RulesConfig;