/**
 * Copyright 2024 Mytra Control S.L. All rights reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be found in the LICENSE file
 * or at https://opensource.org/licenses/MIT.
 */
import { ReadEnvOptions } from '../types';
/**
 * Transform a string to a given format
 * @param key - key to be formatted
 * @param options - options to be applied
 * @param prefix - key prefix
 * @returns
 */
export declare function formatKey(key: string, options: ReadEnvOptions, prefix?: string): string;
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