POSIX One-Liner For Current Directory - Trying to make it pass ShellCheck

The one-liner from mklement0 in this discussion on POSIX-compliant scripts and getting the full path. It's failing ShellCheck. Removing the space causes it to no longer work. https://stackoverflow.com/questions/29832037/how-to-get-script-directory-in-posix-sh

dir=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
             ^-- SC1007: Remove space after = if trying to assign a value (for empty string, use var='' ... ).

Removing CDPATH= results in ShellCheck passing, and it still seems to work, but... > The CDPATH= prefix takes the place of > /dev/null in the original command: $CDPATH is set to a null string so as to ensure that cd never echoes anything. Looks like it's needed. So, is there any way to make this pass ShellCheck? Or just ignore it?