"No debug on commits" hook

pre-commit.sh

#!/bin/sh
if git rev-parse --verify HEAD >/dev/null 2>&1
then
    against=HEAD
else
    # Initial commit: diff against an empty tree object
    against=<PUT_THE_FIRST_COMMIT_HASH_HERE>
fi

# The special marker tag to mark things which we still need to change
marker="debugger"

# Redirect output to stderr.
exec 1>&2

if test $(git diff --cached -z $against | grep $marker | wc -c) != 0 
then
    cat <<\EOF
    Error: YOU LEFT A DEBUGGER ON YOUR CODE. REMOVE IT (pretty please).
EOF
    exit 1
fi

And we can put this file in a .hooks folder in the project, and in the package.json we can set "postinstall": "git config core.hooksPath .hooks" so that everyone must follow this rule.

Or just use husky and add it (untested).