import type { Source as PMTilesSource } from 'pmtiles';
/** Low-level interface for reading byte ranges natively to fulfil RANGE_REQUEST messages from the web runtime. */
export interface NativeRangeReader {
    readRange: (params: {
        offset: number;
        length: number;
        etag?: string;
    }) => Promise<{
        base64Data: string;
        etag?: string;
        expires?: string;
        cacheControl?: string;
    }>;
}
export type RangeRequestMessage = {
    type: 'RANGE_REQUEST';
    id: string;
    offset: number;
    length: number;
    etag?: string;
};
export type RangeResponseMessage = {
    type: 'RANGE_RESPONSE';
    id: string;
    base64Data: string;
    etag?: string;
    expires?: string;
    cacheControl?: string;
};
/**
 * Wraps a PMTiles `Source` object as a `NativeRangeReader` so that
 * RANGE_REQUEST messages from the WebView can be fulfilled by calling
 * `source.getBytes()` directly on the native side without requiring a
 * separate `offlineReader` prop.
 *
 * @example
 * ```ts
 * const source = new PMTiles('/path/to/archive.pmtiles');
 * const reader = pmtilesSourceToReader(source);
 * <EdgePDFViewer imageInfo={imageInfo} offlineReader={reader} />
 * ```
 */
export declare function pmtilesSourceToReader(source: PMTilesSource): NativeRangeReader;
/**
 * Fulfils a RANGE_REQUEST bridge message by delegating to the native reader.
 *
 * @throws {Error} When `offlineReader` is not provided.
 */
export declare function handleRangeRequest(request: RangeRequestMessage, offlineReader?: NativeRangeReader): Promise<RangeResponseMessage>;
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