/**
 * @module teams-ai
 */
/**
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License.
 */
import { TurnContext } from 'botbuilder-core';
import { TurnState } from '../TurnState';
/**
 * @private
 * @returns {Promise<string>} A promise that resolves to a string.
 */
export declare function httpError<TState extends TurnState = TurnState>(): (_context: TurnContext, _state: TState, err?: Error) => Promise<string>;
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