import { Log } from '../../../types';
import { DeepReadonly } from 'ts-essentials';
import { HookStateMap } from './balancer-hook-event-subscriber';
export declare const DirectionalFee: {
    type: "DirectionalFee";
    apiName: "DIRECTIONAL_FEE";
};
export type DirectionalFeeConfig = {
    type: typeof DirectionalFee.type;
    apiName: typeof DirectionalFee.apiName;
    hookAddress: string;
};
export type DirectionalFeeHookState = {
    test: string;
};
/**
 * Retrieve any initial hook state required.
 * @returns
 */
export declare function getDirectionalFeeHookState(): Promise<DirectionalFeeHookState>;
/**
 * Handles the event emitted when a new hook is registered.
 * @param event
 * @param state
 * @param log
 * @returns
 */
export declare function exitFeeHookExampleRegisteredEvent(event: any, state: DeepReadonly<HookStateMap>, log: Readonly<Log>): DeepReadonly<HookStateMap> | null;