/**
 * File size validation and conversion utility
 * Converts human-readable file size strings to bytes
 */
export interface FileSizeValidationResult {
    isValid: boolean;
    bytes: number;
    error?: string;
}
/**
 * Validates and converts a file size string to bytes
 *
 * @param sizeInput - Size string (e.g., "10MB", "1.5G", "512", "500KB")
 * @returns Validation result with bytes value or error
 *
 * @example
 * validateFileSize("10MB") // { isValid: true, bytes: 10485760 }
 * validateFileSize("1.5G") // { isValid: true, bytes: 1610612736 }
 * validateFileSize("invalid") // { isValid: false, bytes: 0, error: "Invalid format" }
 */
export declare function validateFileSize(sizeInput: string): FileSizeValidationResult;
/**
 * Converts bytes to human-readable format
 *
 * @param bytes - Number of bytes
 * @param decimals - Number of decimal places (default: 1)
 * @returns Formatted string (e.g., "10.5 MB", "1.2 GB")
 */
export declare function formatBytes(bytes: number, decimals?: number): string;
/**
 * Convenience function that throws an error if validation fails
 *
 * @param sizeInput - Size string to validate
 * @returns Number of bytes
 * @throws Error if validation fails
 */
export declare function parseFileSize(sizeInput: string): number;