Git hooks post-receive with auto install node modules

post-receive

#!/bin/bash
TRAGET="/path/to/your/website/folder"
GIT_DIR="/path/to/your/git/repo.git"
BRANCH="master"

while read oldrev newrev ref
do
    # only checking out the master (or whatever branch you would like to deploy)
    if [[ $ref = refs/heads/$BRANCH ]];
    then
        echo "Ref $ref received. Deploying ${BRANCH} branch to production..."
        git --work-tree=$TRAGET --git-dir=$GIT_DIR checkout $BRANCH -f

        cd $TRAGET

        # Install node_modules
        git diff-tree -r --name-only --no-commit-id $oldrev $newrev | grep --quiet "package.json" && \
        echo "package.json changed" && \
        echo "Run: npm install" && \
        npm install

        # npm run build
    else
        echo "Ref $ref received. Doing nothing: only the ${BRANCH} branch may be deployed on this server."
    fi
done