/** Human-readable byte formatting and parsing utilities. */
/**
 * Format a byte count into a compact human string, e.g. `72.3 KB`.
 * Uses base-1024 (KiB) which matches Bundlephobia's own display.
 */
export declare function formatBytes(bytes: number, fractionDigits?: number): string;
/**
 * Parse a human size string into bytes. Accepts `500kb`, `1.5 MB`, `2048`,
 * `120 KiB`, etc. Returns `undefined` when the input can't be parsed.
 */
export declare function parseBytes(input: string): number | undefined;
/** Format a signed delta, e.g. `+12.4 KB` / `-3.1 KB`. */
export declare function formatDelta(bytes: number): string;
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