export declare class ObservableEuler<T = any> {
    readonly quaternion: Float64Array;
    private _quatUpdateId;
    private _quatDirtyId;
    private _x;
    private _y;
    private _z;
    private _sign;
    private _callback;
    private _scope;
    constructor(callback: (this: T) => void, scope: T, x?: number, y?: number, z?: number);
    get sign(): number;
    set sign(value: number);
    get x(): number;
    set x(value: number);
    get y(): number;
    set y(value: number);
    get z(): number;
    set z(value: number);
    get pitch(): number;
    set pitch(value: number);
    get yaw(): number;
    set yaw(value: number);
    get roll(): number;
    set roll(value: number);
    set(x?: number, y?: number, z?: number): this;
    copyFrom(euler: ObservableEuler): this;
    copyTo(p: ObservableEuler): ObservableEuler<any>;
    equals(euler: ObservableEuler): boolean;
    update(): boolean;
}