import type { ChunkManifest, InscribedFile } from './types.js';
/**
 * Determines if a file should be chunked based on its size
 *
 * @param fileSize - Size of the file in bytes
 * @param filePath - Path to the file (to check if it's index.html)
 * @param threshold - Size threshold in bytes (default: 4.5MB)
 * @returns true if file should be chunked
 */
export declare function shouldChunkFile(fileSize: number, filePath: string, threshold?: number): boolean;
/**
 * Splits a buffer into chunks with progressive sizing for video files
 *
 * For video files, uses Fibonacci-like progression (1MB → 1MB → 2MB → 3MB → 5MB → 8MB → 10MB)
 * to enable fast playback startup while maintaining efficient streaming.
 *
 * For non-video files, uses uniform chunk size.
 *
 * @param buffer - The buffer to split
 * @param chunkSize - Maximum size of each chunk (used for non-video files)
 * @param filePath - Optional file path to detect video files
 * @returns Array of chunk buffers
 */
export declare function splitFileIntoChunks(buffer: Buffer, chunkSize?: number, filePath?: string): Buffer[];
/**
 * Creates a chunk manifest for client-side reassembly
 *
 * @param originalPath - Original file path
 * @param mimeType - MIME type of the file
 * @param totalSize - Total size of the complete file
 * @param chunkSize - Size of each chunk (for uniform chunking) or max chunk size (for progressive)
 * @param chunkInscriptions - Array of inscribed chunks
 * @returns Chunk manifest object
 */
export declare function createChunkManifest(originalPath: string, mimeType: string, totalSize: number, chunkSize: number, chunkInscriptions: InscribedFile[]): ChunkManifest;
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