A pre-commit hook to minify js & css files.

pre-commit

#!/bin/bash

# A pre-commit hook to update minified versions of
# css/js files on commit

# Go to the project's root
cd "$(dirname "$0")"
cd ../../

# Set up compression command
COMPRESSOR="./node_modules/uglify-js/bin/uglifyjs"

# Make sure compressor exists
if [[ ! -f $COMPRESSOR ]] ; then
    echo 'ERROR: Compressor is not installed! Aborting...'
    exit 1
fi

BRANCH=`git rev-parse --abbrev-ref HEAD`
if [ "$BRANCH" == 'master' ]
then
    # For each css and js file
    # If you want only certain files to be compressed
    # Change it to: for fname in file1 file2 file3; do 
    # TODO: It would be more effective to update only changed files,
    #   i.e. take list of files from staging and minify them instead of all js/css files
    find . -regextype posix-extended \
    -iregex '.+\.(css|js)$' \
    -not -iregex '.+\.min\.(css|js)' \
    -not -path "*node_modules*" \
    -print0 | while IFS= read -r -d $'\0' fname
    do
        echo "Minifying: $fname"
        # Name of minified version: myscript.js -> myscript.min.js
        minified_name="${fname%.*}.min.${fname##*.}"
        # Minify the file
        $COMPRESSOR --rename "$fname" > $minified_name
        # Add the file to commit
        git add $minified_name
    done
fi

Then I doubt you should use this code:) But it is up to you of course. I do not know all the details.