Other TERM values you may wish to look for:

• mintty, mintty-direct, etc.
• vt220, vt340, vt420, vt525, etc.
• tmux

Example patch:

     return 2;
   }
 
-  if (/^screen|^xterm|^vt100|^rxvt|color|ansi|cygwin|linux/i.test(env.TERM)) {
+  if (/^screen|^tmux|^xterm|^vt[1-5][0-9][0-9]|^rxvt|mintty|color|ansi|cygwin|linux/i.test(env.TERM)) {
     return 1;
   }

On any modern Linux distro (or whatever) with a reasonly up-to-date terminfo database, you should be able to get a complete list of VT100+ style TERM values via:

#!/usr/bin/env bash
toe -a | cut -f1 | while read term ; do
    if infocmp "$term" | grep -q -e 'bold=[^, ]*\E\[1m' -e 'sgr0=[^, ]*\E\[0?m' ; then
        echo "$term"
    fi
done

You probably needn't do them all, just the ones that look like they'll be reasonably common. And not all of them support color, though all should support reverse video, bold, underline, etc.