Processing Excel Files

If you need to edit Excel files without destroying their formatting, this is the right tool. It wraps xlsx-populate to preserve merged cells, styles, and complex layouts while you update values or add formulas. Best for working with existing templates or reports where the structure matters. The skill emphasizes good practices like never overwriting source files and using Excel formulas instead of hardcoded calculations. Won't help with reading data (use the lighter xlsx library for that), but for modification work where you can't afford to break someone's carefully formatted spreadsheet, it handles the job cleanly.