requirements

#!/usr/bin/env bash

set -e

if [[ -f /System/Library/CoreServices/SystemVersion.plist ]]; then
  # macOS
  PKG_MANAGER=$(command -v brew) || { echo "Homebrew is not installed. https://brew.sh/"; exit 1; }
else
  PKG_MANAGER=$(command -v yum || command -v apt) || { echo "Platform not supported, check README and Prerequisite docs."; exit 1; }
fi

cd $(dirname $0)
echo "Setting up the prerequisites..."
echo

if [[ -f /etc/os-release ]]; then
   OS_NAME=`(grep -o '^NAME=.*' /etc/os-release | cut -f2 -d\" | sed 's/"//g')`
   PKG_MANAGER="apt";
   PKG_TYPE="deb";
   # Check if OS is RHEL/CentOS
   # In case we have yum and apt-get installed on same machine then set PKG_MANAGER based on OS
   if [[ ${OS_NAME} == *"Red Hat"* || ${OS_NAME} == *"CentOS"* ]]; then
      PKG_MANAGER="yum";
      PKG_TYPE="rpm";
   fi
fi

install_nodejs () {
  isNodeInstalled=`which node` && currentNodeVer=`node -v` || echo ''
   requiredNodeVer="v16.14.0"
  # Check if Node.js is not installed or the installed version is lesser than the ${requiredNodeVer}
  if [[ "$isNodeInstalled" = "" ]] || [[ "$(printf '%s\n' "$requiredNodeVer" "$currentNodeVer" | sort -V | head -n1)" != "$requiredNodeVer" ]]; then
      if [[ "$PKG_MANAGER" == *"brew"* ]]; then
        $1 install node@16
        $1 unlink node
        $1 link --overwrite node@16
      else
       curl -L https://${PKG_TYPE}.nodesource.com/setup_16.x | sudo -E bash -
       sudo $1 install -y nodejs
      fi
  fi
}

install_yarn () {
    isYarnInstalled=`which yarn` && currentYarnVer=`yarn -v` || echo ''
    requiredYarnVer="1.22.19"
    # Check if yarn is not installed or the installed version is lesser than the ${requiredYarnVer}
    if [[ "$isYarnInstalled" = "" ]] || [[ "$(printf '%s\n' "$requiredYarnVer" "$currentYarnVer" | sort -V | head -n1)" != "$requiredYarnVer" ]]; then
        sudo npm install -g yarn
    fi
}

case $PKG_MANAGER in

  *yum*)
    sudo yum install -y curl
    install_nodejs "yum"
    install_yarn
    ;;

  *apt*)
    sudo apt install -y curl
    install_nodejs "apt"
    install_yarn
    ;;

  *brew*)
    install_nodejs "brew"
    install_yarn
    ;;

esac


# Don't run yarn build as root; if you had done, reclaim ownership for .npm and .config files
#sudo chown -R $USER:$GROUP $(sudo find / -type d -name .npm 2>/dev/null)
#sudo chown -R $USER:$GROUP $(sudo find / -type d -name .config 2>/dev/null)


echo "Node.js version: `node -v`"
echo "npm version: `npm -v`"
echo "yarn version: `yarn -v`"