/**
 * @license
 * Copyright 2024 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import { Content, GenerateContentResult, GenerateContentStreamResult, Part, RequestOptions, SingleRequestOptions, StartChatParams } from "../../types";
/**
 * ChatSession class that enables sending chat messages and stores
 * history of sent and received messages so far.
 *
 * @public
 */
export declare class ChatSession {
    model: string;
    params?: StartChatParams;
    private _requestOptions;
    private _apiKey;
    private _history;
    private _sendPromise;
    constructor(apiKey: string, model: string, params?: StartChatParams, _requestOptions?: RequestOptions);
    /**
     * Gets the chat history so far. Blocked prompts are not added to history.
     * Blocked candidates are not added to history, nor are the prompts that
     * generated them.
     */
    getHistory(): Promise<Content[]>;
    /**
     * Sends a chat message and receives a non-streaming
     * {@link GenerateContentResult}.
     *
     * Fields set in the optional {@link SingleRequestOptions} parameter will
     * take precedence over the {@link RequestOptions} values provided to
     * {@link GoogleGenerativeAI.getGenerativeModel }.
     */
    sendMessage(request: string | Array<string | Part>, requestOptions?: SingleRequestOptions): Promise<GenerateContentResult>;
    /**
     * Sends a chat message and receives the response as a
     * {@link GenerateContentStreamResult} containing an iterable stream
     * and a response promise.
     *
     * Fields set in the optional {@link SingleRequestOptions} parameter will
     * take precedence over the {@link RequestOptions} values provided to
     * {@link GoogleGenerativeAI.getGenerativeModel }.
     */
    sendMessageStream(request: string | Array<string | Part>, requestOptions?: SingleRequestOptions): Promise<GenerateContentStreamResult>;
}