/**
 * Damerau-Levenshtein Distance
 * src/metric/DamerauLevenshtein.ts
 *
 * @see https://en.wikipedia.org/wiki/Damerau%E2%80%93Levenshtein_distance
 *
 * The Damerau-Levenshtein distance extends the classical Levenshtein algorithm by
 * including transpositions (swapping of two adjacent characters) as a single edit
 * operation, in addition to insertions, deletions, and substitutions.
 *
 * This metric is particularly useful for detecting and correcting common
 * typographical errors.
 *
 * @module Metric/DamerauLevenshtein
 * @author Paul Köhler (komed3)
 * @license MIT
 */
import type { MetricInput, MetricOptions, MetricCompute } from '../utils/Types';
import { Metric } from './Metric';
export interface DamerauRaw {
    dist: number;
    maxLen: number;
}
/**
 * DamerauLevenshteinDistance class extends the Metric class to implement the Damerau-Levenshtein algorithm.
 */
export declare class DamerauLevenshteinDistance extends Metric<DamerauRaw> {
    /**
     * Constructor for the DamerauLevenshteinDistance class.
     *
     * Initializes the Damerau-Levenshtein metric with two input strings or
     * arrays of strings and optional options.
     *
     * @param {MetricInput} a - First input string or array of strings
     * @param {MetricInput} b - Second input string or array of strings
     * @param {MetricOptions} [opt] - Options for the metric computation
     */
    constructor(a: MetricInput, b: MetricInput, opt?: MetricOptions);
    /**
     * Calculates the normalized Damerau-Levenshtein distance between two strings.
     *
     * @param {string} a - First string (always the shorter string for memory efficiency)
     * @param {string} b - Second string
     * @param {number} m - Length of the first string (a)
     * @param {number} n - Length of the second string (b)
     * @param {number} maxLen - Maximum length of the strings
     * @return {MetricCompute<DamerauRaw>} - Object containing the similarity result and raw distance
     */
    protected compute(a: string, b: string, m: number, n: number, maxLen: number): MetricCompute<DamerauRaw>;
}