import { Block } from "./Block";
export declare class Connection<C extends string> {
    readonly token: string;
    readonly channels: Record<C, string>;
    private constructor();
    join(channel: C): Promise<boolean>;
    send(channel: C, text?: string, blocks?: Block[]): Promise<string | false>;
    upload(channels: C[], title: string, file: File | string, parent?: string): Promise<string | undefined>;
    static open<C extends string>(token: string | undefined, channels: Record<C, string | undefined>): Connection<C> | undefined;
    private static fetch;
    private static postQuery;
    private static postMultipart;
    private static postJson;
    static getToken(code: string, client_id?: string, client_secret?: string): Promise<string | false>;
}