node
PackagesPackage: nodejs
The JavaScript runtime the hosting courses' applications run on. node --version is the first thing to compare between the machine where it works and the one where it does not.
What its options do in the lessons
From the same glossary the lessons render under their commands, so the two cannot disagree.
node --version- Prints the installed version, and nothing else.
node --max-old-space-size- The V8 heap ceiling, in MiB. Set it below the container memory limit, because the heap is not all the memory the process uses.