Shell script to install the latest Node version using fnm, pnpm and jq

upgrade-node.sh

#!/bin/bash

localVersion=$(fnm ls | sort | tail -1 | perl -ne 'if (/.*(v\d+\.\d+\.\d+)/) { print "$1" }')
remoteVersion=$(fnm ls-remote | grep -E '.*v\d+\.\d+\.\d+' | tail -n 1 | perl -ne 'if (/^.*(v\d+\.\d+\.\d+)/) { print "$1" }')

if [[ "$remoteVersion" != "$localVersion" ]]; then
  read -r -n 1 -p "Version $remoteVersion is available. Install it? [Y/n] " shouldInstall
  echo

  case "$shouldInstall" in
    [nN])
      exit 0
      ;;
  esac

  fnm use "$localVersion"

  # shellcheck disable=SC2034
  globalPackages=$(pnpm ls -g --depth 0 --json | jq ".[].dependencies | keys | .[]" | tr -d '"' | tr "\n" " ")

  fnm install "$remoteVersion"
  fnm use "$remoteVersion"
  fnm alias "$remoteVersion" default
  fnm alias "$remoteVersion" latest

  echo Migrating global packages

  npm i -g --silent --no-progress pnpm@latest

  # shellcheck disable=SC2046
  # shellcheck disable=SC2116
  # shellcheck disable=SC2086
  pnpm i -g $(echo $globalPackages)

  echo
  read -r -n 1 -p "Uninstall $localVersion? [Y/n] " shouldUninstall
  echo

  case "$shouldUninstall" in
    [yY] | "")
      fnm uninstall "$localVersion"
      ;;
  esac
else
  echo No new node version available
fi