import type { RandomSource } from '@flighthq/types/contract';
/** Return a random boolean with the given `probability` of being `true`.
 *
 *  Values outside `[0, 1]` behave like the nearest endpoint; `0.5` is a fair coin flip.
 */
export declare function randomBool(random: RandomSource, probability?: number): boolean;
/** Return a random integer in the inclusive range `[min, max]`.
 *
 *  Bounds are passed through `Math.floor`, so fractional bounds are rounded down
 *  rather than rejected. Throws if the resulting `min` is greater than `max`.
 */
export declare function randomInt(random: RandomSource, min: number, max: number): number;
/** Return a random float in the half-open range `[min, max)`. */
export declare function randomRange(random: RandomSource, min: number, max: number): number;
/** Return a random sign: either `1` or `-1` with equal probability. */
export declare function randomSign(random: RandomSource): number;
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