Execute a command with the node and npm version as required in package.json (on arch)

runWithNodeAndNpm.sh

#!/bin/env bash

# requires nvm installed from AUR (i.e. only tested on Arch), and also jq
# run from the project directory like: runWithNodeAndNpm.sh make dev-setup
#  the package.json is taken from the current working directory

NODE_MAJOR_VERSION=$(cat package.json | jq .engines.node | grep -oE '[0-9]*' | head -1)
NPM_MAJOR_VERSION=$(cat package.json | jq .engines.npm | grep -oE '[0-9]*' | head -1)
source /usr/share/nvm/init-nvm.sh
nvm install ${NODE_MAJOR_VERSION} && \
	npm install -g npm@${NPM_MAJOR_VERSION} && \
	${@}