import { SubscriptionArgs } from 'graphql';
import { DefaultContext, Plugin, PromiseOrValue } from '@envelop/core';
export type ContextFactoryOptions = {
    /** The arguments with which the subscription was set up. */
    args: SubscriptionArgs;
};
export type ContextFactoryHook<TContextValue> = {
    /** Context that will be used for the "ExecuteSubscriptionEvent" phase. */
    contextPartial: Partial<TContextValue>;
    /** Optional callback that is invoked once the "ExecuteSubscriptionEvent" phase has ended. Useful for cleanup, such as tearing down database connections. */
    onEnd?: () => void;
};
export type ContextFactoryType<TContextValue = DefaultContext> = (options: ContextFactoryOptions) => PromiseOrValue<ContextFactoryHook<TContextValue> | void>;
export declare const useExtendContextValuePerExecuteSubscriptionEvent: <TContextValue extends Record<any, any>>(createContext: ContextFactoryType<TContextValue>) => Plugin<TContextValue>;