/**
 * Return true if the draw is successful
 * @param threshold between 0 and 100
 */
export declare function performDraw(threshold: number): boolean;
export declare function round(num: number, decimals: 0 | 1 | 2 | 3 | 4): number;
export declare function isPercentage(value: unknown): boolean;
export declare function isNumber(value: unknown): value is number;