import Chunk from './chunk.ts';
import type { Offset, VirtualOffset } from './virtualOffset.ts';
export interface BamOpts {
    viewAsPairs?: boolean;
    pairAcrossChr?: boolean;
    maxInsertSize?: number;
    signal?: AbortSignal;
    /**
     * Called as the BGZF blocks covering the query are fetched, with cumulative
     * downloaded bytes and the total to fetch. Reported at block granularity (one
     * tick per chunk, including instant ticks for cache hits) since chunk byte
     * sizes are known up front from the index. Lets callers render a determinate
     * download progress bar.
     */
    onProgress?: (bytesDownloaded: number, totalBytes?: number) => void;
}
export interface BaseOpts {
    signal?: AbortSignal;
    /**
     * Called as the index (.bai/.csi) is downloaded, with cumulative downloaded
     * bytes and the total. The index is a whole-file read, so this streams real
     * byte progress. Lets callers show a determinate "downloading index" bar.
     * (total is optional to match generic-filehandle2's streaming callback.)
     */
    onProgress?: (bytesDownloaded: number, totalBytes?: number) => void;
}
export declare function optimizeChunks(chunks: Chunk[], lowest?: Offset): Chunk[];
export declare function parsePseudoBin(bytes: Uint8Array, offset: number): {
    lineCount: number;
};
export declare function clampChunkEnds(chunks: Chunk[], extraBoundaries?: number[]): void;
export declare function parseRefSeqs(uncba: Uint8Array, start: number, renameRefSeq: (s: string) => string): {
    chrToIndex: Record<string, number>;
    indexToChr: {
        refName: string;
        length: number;
    }[];
} | undefined;
export declare function findFirstData(firstDataLine: VirtualOffset | undefined, virtualOffset: VirtualOffset): VirtualOffset;
export declare function parseNameBytes(namesBytes: Uint8Array, renameRefSeq?: (arg: string) => string): {
    refNameToId: Record<string, number>;
    refIdToName: string[];
};
export declare function concatUint8Array(args: Uint8Array[]): Uint8Array<ArrayBuffer>;
interface Positioned {
    ref_id: number;
    start: number;
    end: number;
}
export declare function appendInRange<T extends Positioned>(records: T[], chrId: number, min: number, max: number, out?: T[]): T[];
export {};