import { Matrix4Tuple, Vector3Tuple as V3 } from 'three';
export declare const l2: (v1?: V3 | null, v2?: V3 | null) => number | null;
export declare const mat2Pos: (mat?: Float32Array | Matrix4Tuple | null) => V3 | null;
export declare function transposeTuple(mat: Float32Array | Matrix4Tuple): Matrix4Tuple;