import { VecN } from '@holotope/core';
import { type ConstraintRow4 } from './constraint-row4.js';
import { DistanceCoordinate4, type DistanceCoordinate4Options } from './distance-joint4.js';
export interface DistanceMotorConstraint4 extends ConstraintRow4 {
    readonly anchorA: VecN;
    readonly anchorB: VecN;
    readonly direction: VecN;
    readonly currentLength: number;
    readonly velocityTarget: number;
    readonly minForce: number;
    readonly maxForce: number;
}
export type DistanceMotor4Options = DistanceCoordinate4Options & {
    /** Positive lengthens the coordinate; negative shortens it. */
    readonly targetSpeed: number;
    /** Symmetric generalized-force limit. */
    readonly maxForce: number;
};
/** Force-limited velocity motor for one R4 distance coordinate. */
export declare class DistanceMotor4 extends DistanceCoordinate4 {
    targetSpeed: number;
    maxForce: number;
    constructor(options: DistanceMotor4Options);
    constraint(): DistanceMotorConstraint4;
    private assertPolicy;
}
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