import type { UILayerElement, UIPlaneElement } from "../../miscellaneous/shared";
import { UISingleParameterConstraint } from "../UISingleParameterConstraint/UISingleParameterConstraint";
import type { UIAspectConstraintOptions } from "./UIAspectConstraint.Internal";
/** Maintains element aspect ratio (width = height * aspect) */
export declare class UIAspectConstraint extends UISingleParameterConstraint {
    readonly element: UIPlaneElement & UILayerElement;
    /** Solver constraint descriptor */
    protected readonly constraint: number;
    /** Current aspect ratio */
    private aspectInternal;
    /**
     * @param element Element to constrain
     * @param options Aspect configuration. Defaults to element's current ratio.
     */
    constructor(element: UIPlaneElement & UILayerElement, options?: Partial<UIAspectConstraintOptions>);
    /** Current aspect ratio (width/height) */
    get aspect(): number;
    /** Updates aspect ratio */
    set aspect(value: number);
    /** Builds constraint expression: width - (height * aspect) = 0 */
    private buildLHS;
}