declare const BYTE_UNITS:readonly['B','KB','MB','GB','TB'];
/** Maps each byte-unit abbreviation to its localization key. */
export declare const FILE_SIZE_UNIT_KEYS:Record<(typeof BYTE_UNITS)[number],string>;
/**
* `512` -> `"512 B"`; `2415919` -> `"2.3 MB"`. Whole bytes never get a
* decimal; every larger unit gets exactly one decimal place. Returns `""`
* for a negative or non-finite input.
*/
export declare function formatFileSize(bytes:number,unitLabel?:(unit:(typeof BYTE_UNITS)[number])=>string,numberLabel?:(value:number,fractionDigits:number)=>string):string;export{};