import type { SubmittableExtrinsic } from '@polkadot/api/types';
import type { ISubmittableResult } from '@polkadot/types/types';
import type { GearApi } from '../../GearApi';
import type { HexString } from '../../types';
/**
 * Transaction building utilities for Gear-Ethereum bridge operations.
 *
 * This class provides methods to create extrinsics for bridge transactions
 * that can be signed and submitted to the network.
 */
export declare class GearEthBridgeTransactions {
    private _api;
    constructor(_api: GearApi);
    /**
     * Extrinsic that inserts message in a bridging queue,
     * updating queue merkle root at the end of the block.
     *
     * @param destination - The Ethereum address to send the message to
     * @param payload - The message payload data
     * @returns A submittable extrinsic that can be signed and sent
     */
    sendEthMessage(destination: HexString | Uint8Array, payload: HexString | Uint8Array): SubmittableExtrinsic<'promise', ISubmittableResult>;
}