import { Vector3 } from './Vector3';
import type { Matrix4 } from './Matrix4';
declare class Line3 {
    readonly isLine3 = true;
    start: Vector3;
    end: Vector3;
    constructor(start?: Vector3, end?: Vector3);
    set(start: Vector3, end: Vector3): this;
    copy(line: Line3): this;
    getCenter(target?: Vector3): Vector3;
    delta(target?: Vector3): Vector3;
    distanceSq(): number;
    distance(): number;
    at(t: number, target?: Vector3): Vector3;
    closestPointToPointParameter(point: Vector3, clampToLine?: boolean): number;
    closestPointToPoint(point: Vector3, clampToLine?: boolean, target?: Vector3): Vector3;
    applyMatrix4(matrix: Matrix4): this;
    equals(line: Line3): boolean;
    clone(): Line3;
}
export { Line3 };