sheetjs_sheetjs/docbits/31_writestream.md

Streaming Write

The streaming write functions are available in the XLSX.stream object. They take the same arguments as the normal write functions but return a readable stream. They are only exposed in node.

• XLSX.stream.to_csv is the streaming version of XLSX.utils.sheet_to_csv.
• XLSX.stream.to_html is the streaming version of the HTML output type.

https://github.com/sheetjs/sheetaki pipes write streams to nodejs response.