import type { FnU4 } from "@thi.ng/api";
import type { ReadonlyVec } from "@thi.ng/vectors";
import { type IntersectionResult } from "./api.js";
/**
 * 2D only. Computes intersection between two lines defined by pairs `a`,`b` and
 * `c`,`d`.
 *
 * @param a
 * @param b
 * @param c
 * @param d
 * @param eps
 */
export declare const intersectLineLine: (a: ReadonlyVec, b: ReadonlyVec, c: ReadonlyVec, d: ReadonlyVec, eps?: number) => IntersectionResult;
/**
 * 2D only. Returns true if line `a`,`b` is parallel (or coincident) to
 * line `c`,`d`.
 *
 * @param a - line 1 start point
 * @param b - line 1 end point
 * @param c - line 2 start point
 * @param d - line 2 end point
 */
export declare const isParallelLine: FnU4<ReadonlyVec, boolean>;
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