export interface ErnieMessage {
    role: "user" | "assistant";
    content: string;
}
export interface ErnieChatBody {
    messages: ErnieMessage[];
    stream?: boolean;
    system?: string;
}
export declare class ErnieAPI {
    static instances: Map<string, ErnieAPI>;
    private clientId?;
    private clientSecret?;
    private accessToken?;
    private expiresIn?;
    constructor(clientId: string, clientSecret: string);
    static getInstance(clientId: string, clientSecret: string): Promise<ErnieAPI>;
    private initialize;
    private fetchAccessToken;
    request(params: {
        method: "GET" | "POST" | "PUT" | "DELETE";
        url: string;
        data?: any;
    }): Promise<Response>;
}