/**
 * Copyright (c) Microsoft Corporation.
 *
 * 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.
 */
export type ChatMessage = {
    content: string;
    user: 'user' | 'assistant';
};
export declare class Chat {
    private _history;
    private _connectionPromise;
    private _chatSinks;
    private _wsEndpoint;
    constructor(wsEndpoint: string);
    clearHistory(): void;
    post<T>(prompt: string): Promise<T | null>;
    private _append;
    private _connection;
    private _dispatchEvent;
    private _post;
}
export declare function asString(stream: AsyncIterable<string>): Promise<string>;
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