/**
 * @name naclDecrypt
 * @summary Decrypts a message using the supplied secretKey and nonce
 * @description
 * Returns an decrypted message, using the `secret` and `nonce`.
 * @example
 * <BR>
 *
 * ```javascript
 * import { naclDecrypt } from '@polkadot/util-crypto';
 *
 * naclDecrypt([...], [...], [...]); // => [...]
 * ```
 */
export declare function naclDecrypt(encrypted: Uint8Array, nonce: Uint8Array, secret: Uint8Array): Uint8Array | null;