import type { MatrixFileInput, MatrixResult } from '../config/types.js';
/**
 * Compares 2+ env files as a key-presence matrix: every unique key across
 * all files becomes a row, and every file becomes a column.
 *
 * Unlike `diffEnv`, there is no "reference" file here - every file is an
 * equal column, which makes this suitable for comparing N environments
 * (e.g. .env.production vs .env.staging vs .env.example) at once.
 *
 * @param files - The files to compare, each with its parsed key-value pairs.
 * @param checkValues - If true, also flags keys whose value differs across the files that define them.
 * @returns A `MatrixResult` containing one row per unique key and whether everything matches.
 */
export declare function diffMatrix(files: MatrixFileInput[], checkValues?: boolean): MatrixResult;
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