node-when 3.7.8+ds-2 (armhf binary) in ubuntu focal

 A lightweight Promises/A+ and when() implementation, plus other
 async tools.
 .
 A when() function is responsible of triggering actions depending on the
 result of executing asynchronous actions, with submethods to check for
 any or all results, and handling exceptions.
 .
 Promises/A+ is a programming interface for asynchronous operations.
 .
 Node.js is an event-based server-side JavaScript engine.