import { Matrix4 } from "./Matrix4.ts";
import { Quaternion } from "./Quaternion.ts";
export type EulerOrder = "XYZ" | "YXZ" | "ZXY" | "ZYX" | "YZX" | "XZY";
/** Euler angles with configurable rotation order. */
export declare class Euler {
    #private;
    constructor(x?: number, y?: number, z?: number, order?: EulerOrder);
    get x(): number;
    set x(value: number);
    get y(): number;
    set y(value: number);
    get z(): number;
    set z(value: number);
    get order(): EulerOrder;
    set order(value: EulerOrder);
    clone(): Euler;
    copy(euler: Euler): this;
    fromArray(array: [number, number, number, EulerOrder?]): this;
    /** Re-expresses this euler in a different rotation order, preserving orientation. */
    reorder(newOrder: EulerOrder): this;
    set(x: number, y: number, z: number, order?: EulerOrder): this;
    setFromQuaternion(q: Quaternion, order?: EulerOrder): this;
    setFromRotationMatrix(m: Matrix4 | {
        elements: number[];
    }, order?: EulerOrder): this;
    /** Registers a callback invoked whenever x, y, z, or order changes. */
    setOnChangeCallback(callback: () => void): this;
}
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