import type { ExtendedBool } from '../prelude';
import type { Body } from './Body';
import { Constraint } from './Constraint.js';
import type { Vertex } from './Vertex';
/** Exact constraint class (Verlet integration) */
export declare class ExactConstraint extends Constraint {
    length: number;
    constructor(body: Body, v0: Vertex, v1: Vertex, edge: ExtendedBool, stiffness?: number);
    /** Solve the constraint. */
    solve(): void;
}