import type { Account, Address, BaseUnits, ControlFlowOptions, NativeUnits } from '../../../types.js';
import type { Chain } from '../index.js';
import type { Abi, FeeValuesEIP1559, Client } from 'viem';
export type ApproveParams = {
    /** Address of the token */
    token: Address | {
        address: Address;
        abi?: Abi;
    };
    /** Address of the account or contract that will be allowed to spend the tokens. */
    spender: Address;
    /** The amount of tokens that the spender will be allowed to spend */
    value: BaseUnits | NativeUnits;
    /** The blockchain network on which the transaction will be executed. */
    chain?: Chain;
    /** The address or account that will execute the transaction. */
    account: Address | Account;
    /** The gas limit for the transaction. */
    gas?: bigint;
    /** The fee values for the transaction. */
    fees?: FeeValuesEIP1559;
};
/**
 * Executes the `approve` function of the Token Messenger contract for CCTP.
 *
 * @param client - The client instance to use for the operation.
 * @returns Returns the transaction hash of the contract execution
 */
export declare function approve(client: Client, params: ApproveParams & ControlFlowOptions): Promise<`0x${string}`>;