Example Makefile for Elm with multiple targets

Makefile

# Assumes 'elm' is in your PATH, and there is a directory called 'src' containing
# your Elm source code in the same directory as this file.
ELM = elm
OUTPUT = ../assets/javascripts/elm # For Rails asset pipeline, but could be anything
SRCS = MyApp.elm MyOtherApp.elm
TARGETS = $(SRCS:.elm=.js)
ELM_STUFF = elm-stuff/exact-dependencies.json

all: $(TARGETS)

%.js: src/%.elm $(ELM_STUFF)
	$(ELM) make $< --output $(OUTPUT)/$@

$(ELM_STUFF): elm-package.json
	$(ELM) package install

clean:
	echo "Removing build artifacts..."
	rm -rf ./elm-stuff/build-artifacts
	rm -rf ./elm-linter/build-artifacts