/**
 * Computes the 1D Wasserstein distance (Earth Mover's Distance) between two distributions.
 *
 * @category Metrics
 * @param {number[] | Float64Array} a - First distribution (histogram or probability mass)
 * @param {number[] | Float64Array} b - Second distribution (histogram or probability mass)
 * @returns {number} The Wasserstein/EMD distance between `a` and `b`.
 * @see {@link https://en.wikipedia.org/wiki/Wasserstein_metric}
 */
export function wasserstein(a: number[] | Float64Array, b: number[] | Float64Array): number;
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