import type { UIPlaneElement } from "../../miscellaneous/shared";
import { UISingleParameterConstraint } from "../UISingleParameterConstraint/UISingleParameterConstraint";
import type { UIHorizontalProportionConstraintOptions } from "./UIHorizontalProportionConstraint.Internal";
/** Maintains proportional width relationship (A.width * proportion = B.width) */
export declare class UIHorizontalProportionConstraint extends UISingleParameterConstraint {
    readonly a: UIPlaneElement;
    readonly b: UIPlaneElement;
    protected readonly constraint: number;
    private proportionInternal;
    /**
     * @param a First element
     * @param b Second element
     * @param options Proportion configuration
     */
    constructor(a: UIPlaneElement, b: UIPlaneElement, options?: Partial<UIHorizontalProportionConstraintOptions>);
    /** Current proportion multiplier */
    get proportion(): number;
    /** Updates proportion multiplier */
    set proportion(value: number);
    /** Builds constraint expression for proportional relationship */
    private buildRHS;
}