/**
 * @module botbuilder
 */
/**
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License.
 */
import { Activity, BotFrameworkClient, InvokeResponse } from 'botbuilder-core';
import { AppCredentials, ICredentialProvider } from 'botframework-connector';
/**
 * HttpClient for calling skills from a Node.js BotBuilder V4 SDK bot.
 */
export declare class BotFrameworkHttpClient implements BotFrameworkClient {
    protected readonly channelService: string;
    /**
     * Cache for appCredentials to speed up token acquisition (a token is not requested unless is expired)
     * AppCredentials are cached using appId + scope (this last parameter is only used if the app credentials are used to call a skill)
     */
    private static readonly appCredentialMapCache;
    private readonly credentialProvider;
    /**
     * Creates a new instance of the [BotFrameworkHttpClient](xref:botbuilder.BotFrameworkHttpClient) class
     * @param credentialProvider An instance of [ICredentialProvider](xref:botframework-connector.ICredentialProvider).
     * @param channelService Optional. The channel service.
     */
    constructor(credentialProvider: ICredentialProvider, channelService?: string);
    /**
     * Forwards an activity to another bot.
     * @remarks
     *
     * @template T The type of body in the InvokeResponse.
     * @param fromBotId The MicrosoftAppId of the bot sending the activity.
     * @param toBotId The MicrosoftAppId of the bot receiving the activity.
     * @param toUrl The URL of the bot receiving the activity.
     * @param serviceUrl The callback Url for the skill host.
     * @param conversationId A conversation ID to use for the conversation with the skill.
     * @param activity Activity to forward.
     */
    postActivity<T = any>(fromBotId: string, toBotId: string, toUrl: string, serviceUrl: string, conversationId: string, activity: Activity): Promise<InvokeResponse<T>>;
    /**
     * Logic to build an [AppCredentials](xref:botframework-connector.AppCredentials) to be used to acquire tokens for this `HttpClient`.
     * @param appId The application id.
     * @param oAuthScope Optional. The OAuth scope.
     *
     * @returns The app credentials to be used to acquire tokens.
     */
    protected buildCredentials(appId: string, oAuthScope?: string): Promise<AppCredentials>;
    /**
     * Gets the application credentials. App Credentials are cached so as to ensure we are not refreshing
     * token every time.
     * @private
     * @param appId The application identifier (AAD Id for the bot).
     * @param oAuthScope The scope for the token, skills will use the Skill App Id.
     */
    private getAppCredentials;
}
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