/**
 * Helps with generating random numbers.
 */
export declare class Random {
    /**
     * The value this PRNG was seeded with.
     */
    private _seed;
    /**
     * Retrieve the seed of the PRNG.
     * @returns The seed of the PRNG.
     */
    get seed(): number;
    /**
     * The permutation table for simplex noise.
     */
    private _perm;
    /**
     * The gradient map for simplex noise.
     */
    private _gradP;
    /**
     * Skewing and unskewing factors for 2, 3, and 4 dimensions.
     */
    private _F2;
    /**
     * Skewing and unskewing factors for 2, 3, and 4 dimensions.
     */
    private _G2;
    /**
     * Creates a pseudo-random value generator. The seed must be an integer.
     *
     * Uses an optimized version of the Park-Miller PRNG.
     * http://www.firstpr.com.au/dsp/rand31/
     * @param seed - The seed for the random number generator.
     */
    constructor(seed?: number);
    /**
     * Returns a pseudo-random value between 1 and 2^32 - 2.
     * @returns A pseudo-random value between 1 and 2^32 - 2.
     */
    next(): number;
    /**
     * Returns a random value in a given range.
     * @param min - The lower bound.
     * @param max - The upper bound.
     * @returns A random value between the lower and upper bound.
     */
    nextRange(min: number, max: number): number;
    /**
     * Returns either `true` or `false`.
     * @returns Either `true` or `false`.
     */
    nextBoolean(): boolean;
    /**
     * Returns a pseudo-random floating point number in range [0, 1).
     * @returns a pseudo-random floating point number in range [0, 1).
     */
    nextFloat(): number;
    /**
     * Creates a new Random instance, with a seed that is based of the seed
     * of this Random instance.
     * @returns A new random number generator.
     */
    nextRandom(): Random;
    static ALLOWED_CHARACTERS: string;
    /**
     * Returns a random ASCII string.
     * @param length - The length of the string.
     * @returns A random ASCII string.
     */
    nextString(length: number, characters?: string): string;
    /**
     * Returns a 2D simplex noise value for a given input coordinate.
     * @param x - The X input coordinate.
     * @param y - The Y input coordinate.
     * @returns The noise value for the input coordinates.
     */
    simplex2(x: number, y: number): number;
    /**
     * Returns a 3D simplex noise value for a given input coordinate.
     * @param x - The X input coordinate.
     * @param y - The Y input coordinate.
     * @param z - The Z input coordinate.
     * @returns The noise value for the input coordinates.
     */
    simplex3(x: number, y: number, z: number): number;
}
/**
 * Returns a random value in a given range.
 *
 * Uses the JS-internal `Math.random()`. Use {@linkcode Random} for a PRNG with more features.
 *
 * Note that this method returns floating point numbers, regardless of your inputs potentially
 * being integers. If you require integers, ensure to truncate the resulting random value.
 * @param min - The lower bound.
 * @param max - The upper bound.
 * @returns A random value between the lower and upper bound.
 */
export declare const randomRange: (min: number, max: number) => number;
/**
 * Generates a numberic seed, to be used as an input for a PRNG,
 * from a string.
 * @param input - The string to use as a seed.
 * @returns A numeric seed value for a PRNG.
 */
export declare const seedFromString: (input: string) => number;
/**
 * A global PRNG instance that is ready-to-use.
 */
export declare const random: Random;