import type { Matrix4 } from "./Matrix4.ts";
import { Vector3 } from "./Vector3.ts";
/** Finite line segment between two 3D points. */
export declare class Line3 {
    #private;
    constructor(start?: Vector3, end?: Vector3);
    get start(): Vector3;
    set start(value: Vector3);
    get end(): Vector3;
    set end(value: Vector3);
    get delta(): Vector3;
    get length(): number;
    get lengthSq(): number;
    applyMatrix4(m: Matrix4): Line3;
    at(t: number, target?: Vector3): Vector3;
    clone(): Line3;
    closestPointToPoint(point: Vector3, clampToLine?: boolean, target?: Vector3): Vector3;
    closestPointToPointParameter(point: Vector3, clampToLine?: boolean): number;
    copy(line: Line3): Line3;
    equals(line: Line3): boolean;
    getCenter(target?: Vector3): Vector3;
    set(start: Vector3, end: Vector3): Line3;
}
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