export declare class SimplexNoise4D {
    private readonly _NORM_4D;
    private readonly _SQUISH_4D;
    private readonly _STRETCH_4D;
    private readonly _base4D;
    private readonly _gradients4D;
    private _lookup;
    private readonly _lookupPairs4D;
    private readonly _p4D;
    private _perm;
    private _perm4D;
    constructor();
    noise(x: number, y: number, z: number, w: number): number;
    seed(clientSeed: number): void;
    private _contribution4D;
}