/**
 * Format a file size in bytes to a human-readable string
 *
 * Converts bytes to the appropriate unit (Bytes, KB, MB, GB)
 * with proper rounding to 2 decimal places.
 *
 * @param bytes - The file size in bytes
 * @returns Formatted string with appropriate unit
 *
 * @example
 * formatFileSize(1024) // "1 KB"
 * formatFileSize(1536) // "1.5 KB"
 * formatFileSize(1048576) // "1 MB"
 * formatFileSize(0) // "0 Bytes"
 */
export declare const formatFileSize: (bytes: number) => string;
/**
 * Convert file size from one unit to another
 *
 * @param value - The numeric value to convert
 * @param fromUnit - Source unit (bytes, kb, mb, gb, tb)
 * @param toUnit - Target unit (bytes, kb, mb, gb, tb)
 * @returns Converted value
 *
 * @example
 * convertFileSize(1, "mb", "kb") // 1024
 * convertFileSize(1024, "kb", "mb") // 1
 */
export declare const convertFileSize: (value: number, fromUnit: "bytes" | "kb" | "mb" | "gb" | "tb", toUnit: "bytes" | "kb" | "mb" | "gb" | "tb") => number;
/**
 * Parse a human-readable file size string back to bytes
 *
 * @param sizeString - String like "1.5 KB", "2 MB", etc.
 * @returns Size in bytes, or null if parsing fails
 *
 * @example
 * parseFileSize("1.5 KB") // 1536
 * parseFileSize("2 MB") // 2097152
 * parseFileSize("invalid") // null
 */
export declare const parseFileSize: (sizeString: string) => number | null;
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