import type { Fetcher } from './types';
export interface RangeFetchResult {
    /** Raw bytes returned for this range. */
    bytes: ArrayBuffer;
    /** True if the server's response indicates more data exists past `endExclusive`. */
    truncated: boolean;
    /** Total file size in bytes if the server reported it (Content-Range or Content-Length). */
    totalSize: number | null;
}
/**
 * Fetch `[start, endExclusive)` bytes from `url` using a `Range` header.
 *
 * - If the server responds with `206 Partial Content`, parses Content-Range
 *   to determine truncation.
 * - If the server returns the full body (`200 OK` — common for small files
 *   or servers that ignore Range), uses Content-Length.
 * - On non-OK responses, throws `RangeFetchError` with the response status.
 */
export declare function rangeFetch(url: string, start: number, endExclusive: number, fetcher?: Fetcher, init?: RequestInit): Promise<RangeFetchResult>;
/**
 * Fetch the LAST `n` bytes of a resource. Mirrors HTTP's negative-offset
 * Range syntax (`Range: bytes=-N`). Used by the mcap previewer to read the
 * footer without first knowing the file size.
 */
export declare function rangeFetchTail(url: string, n: number, fetcher?: Fetcher, init?: RequestInit): Promise<RangeFetchResult>;
export declare class RangeFetchError extends Error {
    status: number;
    constructor(message: string, status: number);
}
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