export interface StreamSaverOptions {
    getMitmUrl: () => Promise<string>;
}
export interface CreateWriteStreamOptions {
    size?: number;
    pathname?: string;
    writableStrategy?: QueuingStrategy<Uint8Array>;
    readableStrategy?: QueuingStrategy<Uint8Array>;
}
export declare class StreamSaver {
    private downloadIframe;
    private mitm;
    private mitmTransporter;
    private supportsTransferable;
    private useBlobFallback;
    private downloadStrategy;
    private options;
    private swState;
    constructor(options: StreamSaverOptions);
    private init;
    private test;
    private resolveMitmUrl;
    private makeIframe;
    private getDownloadIframe;
    private makePopup;
    private loadTransporter;
    createWriteStream(filename: string, options?: CreateWriteStreamOptions | QueuingStrategy<Uint8Array>, size?: number): WritableStream<Uint8Array>;
    private createBlobStream;
    private createSwStream;
    private setupSwConnection;
}