1  import dayjs from 'dayjs';
 2  
 3  /**
 4   * Generic CSV export utility
 5   * @param headers - Column header labels
 6   * @param rows - 2D array of cell values
 7   * @param filename - Output filename (without extension and date suffix)
 8   */
 9  export function exportCSV(
10    headers: string[],
11    rows: (string | number | null | undefined)[][],
12    filename: string,
13  ): void {
14    const BOM = '\uFEFF';
15    const csv =
16      BOM +
17      [headers, ...rows]
18        .map((r) =>
19          r.map((c) => `"${String(c ?? '').replace(/"/g, '""')}"`).join(','),
20        )
21        .join('\n');
22  
23    const blob = new Blob([csv], { type: 'text/csv;charset=utf-8;' });
24    const url = URL.createObjectURL(blob);
25    const a = document.createElement('a');
26    a.href = url;
27    a.download = `${filename}-${dayjs().format('YYYYMMDD-HHmmss')}.csv`;
28    a.click();
29    URL.revokeObjectURL(url);
30  }