/**
* A Matrix is simply an array of arrays, where each sub-array (the rows) have the same length:
*
* let matrix2 = [
*    [ 1, 1, 1, 1, 1, 1 ],
*    [ 2, 0, 0, 0, 0, 4 ],
*    [ 2, 0, 1, 2, 0, 4 ],
*    [ 2, 0, 3, 4, 0, 4 ],
*    [ 2, 0, 0, 0, 0, 4 ],
*    [ 3, 3, 3, 3, 3, 3 ]
*];
*/
export default function (matrix: any): boolean;