import type { PushSubscription } from './types.js';
/**
 * Encrypts the payload for a push notification using the provided keys and context.
 *
 * @param {CryptoKeyPair} localKeys - The local key pair used for encryption.
 * @param {Uint8Array} salt - The salt used in the encryption process.
 * @param {string} payload - The original payload to encrypt.
 * @param {PushSubscription} target - The target push subscription containing client keys.
 * @returns {Promise<ArrayBuffer>} A promise that resolves to the encrypted payload.
 */
export declare const encryptPayload: (localKeys: CryptoKeyPair, salt: Uint8Array<ArrayBuffer>, payload: string, target: PushSubscription) => Promise<ArrayBuffer>;