I think the widely-implemented terminal escape sequences are well-known at this point, but I don't see why I'd want to copy this into every project.
Also, I'm guessing if I pipe your logs to a file you'll still write escapes into it? Why not just make life easier?
Arguably, using a library is also "copy it into every project".
that's needlessly pedantic. the GP is noting that it's built into node's standard library, which might discourage you from installing a library or copying a table of ansi escapes.