/** Measure label width using canvas text metrics (falls back to heuristic in Node). */
export declare function measureTextWidth(text: string, fontSize: number, fontWeight?: string | number, fontFamily?: "'Inter', 'Segoe UI', system-ui, sans-serif"): number;
export declare function centerTextX(label: string, boxWidth: number, fontSize?: number, fontWeight?: string | number, fontFamily?: "'Inter', 'Segoe UI', system-ui, sans-serif"): number;