If you want to ignore only the two specific ones then add
backend/config.js
frontend/config.js
If you want to ignore all config files in subdirectories, as well as the directory that .gitignore
is placed, add
**/config.js
In case you were tracking the mentioned files before and you would like to stop tracking them from now on, you can run git rm --cached <file name>
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solved How to ignore a file in two diff directories in .gitignore