import { BigNumber, ethers } from 'ethers';
import { SignerOrProvider } from './bridgeNetwork';
import { Bridger, GasAndFeeEstimation, TransferParams } from './bridger';
export declare class CctpBridger extends Bridger {
    /**
     * Estimates gas and fees for a token transfer operation.
     * @override
     */
    getGasAndFeeEstimation(amount: BigNumber, provider: SignerOrProvider, _from: string): Promise<GasAndFeeEstimation>;
    /**
     * Estimates gas and fees for token approval.
     * @override
     */
    getApprovalGasAndFeeEstimation(amount: BigNumber, _provider: SignerOrProvider, _from: string): Promise<GasAndFeeEstimation>;
    isCctp(): boolean;
    /**
     * Gets the allowance for the deposit spender.
     * @override
     */
    getAllowance(provider: ethers.Signer | ethers.providers.Provider | string, account: string): Promise<BigNumber | null>;
    /**
     * Gets the allowance for native ETH.
     * @override
     */
    getNativeAllowance(provider: ethers.Signer | ethers.providers.Provider | string, account: string): Promise<BigNumber | null>;
    /**
     * Approves a specified amount of ERC20 tokens for transfer.
     * @override
     */
    approve(amount: BigNumber, signer: ethers.Signer): Promise<ethers.ContractTransaction>;
    /**
     * Approves a specified amount of native ETH for transfer.
     * @override
     */
    approveNative(amount: BigNumber, signer: ethers.Signer): Promise<ethers.ContractTransaction>;
    /**
     * Executes a token transfer between networks.
     * @override
     */
    transfer(params: TransferParams): Promise<ethers.ContractTransaction>;
}