interface FormatBytesOptions {
    /**
     * Number of decimal places to include in the output.
     * @default 2
     */
    decimalPlaces?: number;
    /**
     * If true, uses binary prefixes (KiB, MiB, GiB - base 1024).
     * If false, uses decimal prefixes (KB, MB, GB - base 1000).
     * @default false (use decimal prefixes)
     */
    useBinary?: boolean;
    /**
     * If true, always shows the specified number of decimal places, even if they are zero.
     * e.g., true -> "1.00 MB", false -> "1 MB" if value is exactly 1MB.
     * @default false
     */
    fixedDecimals?: boolean;
    /**
     * If true, includes a space between the number and the unit.
     * e.g., true -> "1.23 MB", false -> "1.23MB".
     * @default true
     */
    includeUnitSpace?: boolean;
}

/**
 * Formats a number of bytes into a human-readable string.
 * @param bytes The number of bytes to format.
 * @param options Optional formatting configuration.
 * @returns A human-readable string representation of the byte size.
 * @throws {TypeError} If input `bytes` is not a number.
 */
declare function formatBytes(bytes: number, options?: FormatBytesOptions): string;
/**
 * Parses a human-readable byte string (e.g., "512KB", "1.5 GiB") into a number of bytes.
 * Supports both decimal (KB, MB) and binary (KiB, MiB) units case-insensitively.
 * @param sizeString The human-readable byte string to parse.
 * @returns The number of bytes, or null if the string is unparseable.
 * @throws {TypeError} If input `sizeString` is not a string.
 */
declare function parseBytes(sizeString: string): number | null;

export { type FormatBytesOptions, formatBytes, parseBytes };