declare function choose<T>(from: T[], n: number, rng?: () => number): T[];
declare function coin(prob: number, rng: () => number): boolean;
declare function uniform<T>(array: readonly T[], rng: () => number): T;
declare function categorical(weights: number[], rng: () => number): number;
export declare function categoricalPrecomputed(cumsum: number[], arraylength: number | undefined, rng: () => number): number;
declare function shuffle<T>(array: T[], rng: () => number): void;
declare function randint(low: number, high: number, rng: () => number): number;
declare class ReservoirSampler<T> {
    private _targetSize;
    private _rng;
    private _counter;
    private _reservoir;
    constructor(targetSize: number, rng: () => number);
    get length(): number;
    [Symbol.iterator](): Iterator<T>;
    get counter(): number;
    get sampled(): readonly T[];
    reset(): void;
    add(element: T): T | undefined;
}
export { ReservoirSampler, coin, uniform, choose, categorical, shuffle, randint };