Git pre-commit hook that detects if the developer forget to remove all javascript console.log statements before commit.

pre-commit

#!/bin/sh
# Prevent console.log from appearing in commits
# https://gist.github.com/guilherme/9604324

# Redirect output to stderr
exec 1>&2
# Enable user input
exec < /dev/tty

consoleregexp='^\+.*console\.log'
if test $(git diff --cached | grep $consoleregexp | wc -l) != 0; then
  exec git diff --cached | grep -ne $consoleregexp
  read -p "There are some occurrences of console.log in your modification. Are you sure want to continue? (y/n) " yn
  echo $yn | grep ^[Yy]$
  if [ $? -eq 0 ]; then
    exit 0; # Continue
  else
    exit 1; # Halt
  fi
fi

pre-commit (no confirm)

#!/bin/sh
# Prevent console.log from appearing in commits without user input
# https://gist.github.com/guilherme/9604324

# Redirect output to stderr
exec 1>&2

consoleregexp='^\+.*console\.log'
if test $(git diff --cached | grep $consoleregexp | wc -l) != 0; then
  echo "There are some occurrences of console.log in your modification. Remove them to commit."
  exec git diff --cached | grep -ne $consoleregexp
  exit 1;
fi
exit 0;

To install, download and paste into your .git/hooks/pre-commit file and set it as executable with chmod +x pre-commit.

In VS Code, and some other tools with git integration, user input through /dev/tty is not supported, so an alternate hook is included that omits user confirmation and always blocks commits including console.log.