/**
 * The options that can be supplied when drawing a single winning ticket.
 */
export declare type DrawOptions = {
    /** Whether the ticket is redrawable. Defaults to 'true'. */
    redrawable?: boolean;
};
/**
 * The options that can be supplied when drawing multiple winning tickets.
 */
export declare type DrawMultipleOptions = DrawOptions & {
    /** Whether duplicate entries of participants with multiple winning tickets should be removed from the result. Defaults to 'false'. */
    unique?: boolean;
};
/**
 * Represents a lotto consisting of a number of pickable ticket-holding participants.
 */
export declare class Lotto<TParticipant> {
    /** The array of participants that are holding tickets in the lotto. */
    private _participants;
    /** The custom RNG to use in place of Math.random(). */
    private readonly _customRandom;
    /**
     * Creates a new instance of Lotto.
     * @param customRandom The custom RNG to use in place of Math.random().
     */
    constructor(customRandom?: () => number);
    /**
     * Adds a participant with the specified number of tickets, or adds to the participant ticket count if the participant already holds tickets.
     * @param participant The participant to add or to increase the ticket count for if they already hold tickets.
     * @param tickets The number of tickets, defaults to 1.
     * @returns The Lotto instance.
     */
    add(participant: TParticipant, tickets?: number): Lotto<TParticipant>;
    /**
     * Removes the specified number of tickets for the given participant from the draw, or all tickets if a ticket number is not defined.
     * @param participant The participant to remove tickets for.
     * @param tickets The number of tickets to remove, or undefined if all tickets are to be removed.
     * @returns The Lotto instance.
     */
    remove(participant: TParticipant, tickets?: number): Lotto<TParticipant>;
    /**
     * Draw a winning ticket and return the participant that holds the ticket.
     * @param options The draw options.
     * @returns The participant that holds the winning ticket.
     */
    draw(options?: DrawOptions): TParticipant | null;
    /**
     * Draws multiple winning tickets and return an array of the participants that hold the winning tickets.
     * @param tickets The number of winning tickets to draw.
     * @param options The draw multiple options.
     * @returns An array of the participants that hold the winning tickets.
     */
    drawMultiple(tickets: number, options?: DrawMultipleOptions): TParticipant[];
}