/**
 * Computes the Mahalanobis distance. You first need to compute the inverted covariance matrix of your data with `getCovarianceMatrix`.
 *
 * @example
 * Basic usage
 * ```js
 * const x1 = [1, 2];
 * const x2 = [3, 4];
 * const invCovMatrix = [
 *   [1, 0],
 *   [0, 1]
 * ];
 * const distance = getMahalanobisDistance(x1, x2, invCovMatrix);
 * ```
 *
 * @param x1 - The first data point
 * @param x2 - The second data point
 * @param invCovMatrix - The inverted covariance matrix
 *
 * @category Statistics
 */
export default function getMahalanobisDistance(x1: number[], x2: number[], invCovMatrix: number[][]): number;