import GziIndex from './gziIndex.ts';
import type { GenericFilehandle } from 'generic-filehandle2';
declare function createLimit(concurrency: number): <T>(task: () => Promise<T> | T) => Promise<T>;
export default class BgzFilehandle {
    filehandle: GenericFilehandle;
    gzi: GziIndex;
    limit: ReturnType<typeof createLimit>;
    constructor({ filehandle, gziFilehandle, blockConcurrency, }: {
        filehandle: GenericFilehandle;
        gziFilehandle: GenericFilehandle;
        blockConcurrency?: number;
    });
    private _readAndUncompressBlock;
    read(length: number, position: number): Promise<Uint8Array<ArrayBuffer>>;
}
export {};