make for executing npm scripts

Makefile

# Use jq to grab the various scripts from package.json and expose them as a make targets
# Based on the awesome script from https://gist.github.com/kvz/79554af7f2d1b1379536
# (but with jq... for something different)
# can use autocomplete (make <TAB><TAB> )
TARGETS:=$(shell jq -r ".scripts | keys | .[]" package.json | sed 's/:/-/g')
define npm_script_targets
$$(TARGETS):
	npm run $(subst -,:,$(MAKECMDGOALS))

.PHONY: $$(TARGETS)
endef

$(eval $(call npm_script_targets))