I added a short decision guide for a search that keeps grouping different tools under the same phrase:

https://proompteng.github.io/bilig/javascript-spreadsheet-library-headless-node.html

The point is not "use bilig for every spreadsheet-shaped thing." The page separates four jobs:

• browser grids where people edit cells
• XLSX readers and writers
• formula engines
• backend WorkPaper runtimes for Node services and coding agents

@bilig/headless is only meant for the last case: a service or agent needs to change workbook inputs, read calculated cells, persist state, restore it, and prove the result after the edit.

If you are evaluating spreadsheet logic in Node, I would like feedback on three things:

1. Is the split between grid, file toolkit, formula engine, and WorkPaper runtime clear?
2. Which JavaScript spreadsheet library or workload should be represented better?
3. What runnable example would make the choice obvious?