/// <reference types="node" />
import { AsyncLocalStorage } from 'async_hooks';
declare global {
    var expressHttpContextStorage: AsyncLocalStorage<Map<string, any>>;
}
/**
 * Express.js middleware that is responsible for initializing the context for
 * each request.
 *
 * Declared as type 'any' because otherwise Typescript consumers can get tie
 * themselves in knots.
 */
export declare const middleware: any;
/**
 * Gets a value from the context by key.
 *
 * Will return undefined if the context has not yet been initialized for this
 * request, or if a value is not found for the specified key.
 */
export declare function get<T = any>(key: string): T | undefined;
/**
 * Adds a value to the context by key.
 *
 * If the key already exists, its value will be overwritten.
 * No value will be persisted if the context has not yet been initialized.
 *
 * Returns the value that was set, or undefined if the context has not yet been
 * initialized for this request.
 */
export declare function set<T = any>(key: string, value: T): T | undefined;
declare const _default: {
    get: typeof get;
    middleware: any;
    set: typeof set;
};
export default _default;