Git pre-commit hook to prevent fdescribe et al.

pre-commit

#!/bin/sh

# Called by "git commit" with no arguments.  The hook should
# exit with non-zero status after issuing an appropriate message if
# it wants to stop the commit.

# uncomment next line for debugging, will print all expanded bash commands
#set -x

# Yes, if you put "fdescribe" in a comment block, this will still abort the
# commit and you're also an asshole.

# move to top level of git repo
cd `git rev-parse --show-toplevel`

branch=`git rev-parse --abbrev-ref HEAD`
changedFiles=`git diff $branch --name-only -G"fdescribe|fit|describe\.only|it\.only|debugger"`
if [ -n "$changedFiles" ]
then
  matchesFound=`git diff $branch --name-only -G"fdescribe|fit|describe\.only|it\.only|debugger" | grep "\.js$" | xargs grep -Hn --color=always -C 3 "fdescribe\|fit\|describe\.only\|it\.only\|debugger"` 
  if [ -n "$matchesFound" ]
  then
    echo "Beep boop, I've been told to warn users when I find these things..."
    echo ""
    echo "$matchesFound"
    echo ""
    echo "\033[0;33mAborting commit\033[0;m because of...reasons"
    echo "To ignore warning and continue, use"
    echo ""
    echo "    \033[0;34mgit commit --no-verify\033[0;m"
    echo ""

    # move back to original working directory
    cd -
    exit 1
  fi
fi

# move back to original working directory
cd -
exit 0

Add this file to your .git/hooks folder in your git repo. The file should be named pre-commit.
This hook runs every time you try to commit. Aborts the commit if your staged changed include fdescribe, fit, describe.only, it.only, or debugger.