import type { ErrorType } from '../errors/utils.js';
import type { Hex } from '../types/data.js';
import type { SignableMessage } from '../types/signature.js';
import { type HashMessageErrorType } from './hashMessage.js';
import { type SignErrorType, type SignReturnType, type To } from './sign.js';
export type SignMessageParameters<to extends To = 'hex'> = {
    /** The message to sign. */
    message: SignableMessage;
    /** The private key to sign with. */
    privateKey: Hex;
    /** The format to return the signature in. */
    to?: to | To | undefined;
};
export type SignMessageReturnType<to extends To = 'hex'> = SignReturnType<to>;
export type SignMessageErrorType = SignErrorType | HashMessageErrorType | ErrorType;
/**
 * @description Calculates an Ethereum-specific signature in [EIP-191 format](https://eips.ethereum.org/EIPS/eip-191):
 * `keccak256("\x19Ethereum Signed Message:\n" + len(message) + message))`.
 *
 * @returns The signature.
 */
export declare function signMessage<to extends To>(parameters: SignMessageParameters<to>): SignMessageReturnType<to>;
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