A simple way to symlink local npm packages into your node_modules for testing

ln-pkg.sh

#!/bin/bash -e
################################################################################
# Links a local Node.js package directory into the current node_modules/ folder.
# This is simpler and more isolated than `npm link` so it's better for quick one-off testing.
#
# USAGE:
#    ~/bin/ln-pkg.sh LOCAL_PKG_DIR [LOCAL_PKG_DIR_2]
#
################################################################################
[ -d "node_modules" ] || { echo "missing node_modules/"; exit 1; }
for D in "$@"; do
	if [ -d "$D/packages/" ]; then
		"$0" "$D/packages/"*/
	else
		N=$(F="$D/package.json" node -p 'require(process.env.F).name')
		L=$(echo "$N" | grep / | cut -f1 -d/ || echo "$N")
		rm -fr "node_modules/$N"
		mkdir -p "node_modules/$L"
		ln -sv "$(cd "$D"; pwd)" "node_modules/$N"
	fi
done