export declare class Vector4 {
    x: number;
    y: number;
    z: number;
    w: number;
    constructor(x?: number, y?: number, z?: number, w?: number);
    static fromArray(arr: number[]): Vector4;
    toArray(): [number, number, number, number];
    add(other: Vector4): Vector4;
    subtract(other: Vector4): Vector4;
    multiply(scalar: number): Vector4;
    length(): number;
    normalize(): Vector4;
    distance(other: Vector4): number;
}
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