Makefiles to handle Jekyll websites https://simpleit.rocks/how-to-add-bootstrap-4-to-jekyll-the-right-way/

Makefile

SHELL := /bin/bash
YARN := yarn
VENDOR_DIR = assets/vendor/
JEKYLL := jekyll

PROJECT_DEPS := package.json

.PHONY: all clean install update

all : serve

check:
	$(JEKYLL) doctor
	$(HTMLPROOF) --check-html \
		--http-status-ignore 999 \
		--internal-domains localhost:4000 \
		--assume-extension \
		_site

install: $(PROJECT_DEPS)
	$(YARN) install

update: $(PROJECT_DEPS)
	$(YARN) upgrade

include-yarn-deps:
	mkdir -p $(VENDOR_DIR)
	cp node_modules/jquery/dist/jquery.min.js $(VENDOR_DIR)
	cp node_modules/popper.js/dist/uml/popper.min.js $(VENDOR_DIR)
	cp node_modules/bootstrap/dist/js/bootstrap.min.js $(VENDOR_DIR)

build: install include-yarn-deps
	$(JEKYLL) build

serve: install include-yarn-deps
	JEKYLL_ENV=production $(JEKYLL) serve

Makefile-with-bundler

SHELL := /bin/bash
BUNDLE := bundle
YARN := yarn
VENDOR_DIR = assets/vendor/
JEKYLL := $(BUNDLE) exec jekyll

PROJECT_DEPS := Gemfile package.json

.PHONY: all clean install update

all : serve

check:
	$(JEKYLL) doctor
	$(HTMLPROOF) --check-html \
		--http-status-ignore 999 \
		--internal-domains localhost:4000 \
		--assume-extension \
		_site

install: $(PROJECT_DEPS)
	$(BUNDLE) install --path vendor/bundler
	$(YARN) install

update: $(PROJECT_DEPS)
	$(BUNDLE) update
	$(YARN) upgrade

include-yarn-deps:
	mkdir -p $(VENDOR_DIR)
	cp node_modules/jquery/dist/jquery.min.js $(VENDOR_DIR)
	cp node_modules/popper.js/dist/uml/popper.min.js $(VENDOR_DIR)
	cp node_modules/bootstrap/dist/js/bootstrap.min.js $(VENDOR_DIR)

build: install include-yarn-deps
	$(JEKYLL) build

serve: install include-yarn-deps
	JEKYLL_ENV=production $(JEKYLL) serve

I've found your tutorial very helpful - thank you!

I seem to be missing something once I get to the section titled "OPTIONAL: Keep node_modules out of _site". I would like to keep node_modules out _site for production build. I don't have a preference on using Bundler or not. It's unclear to me whether I name this file Makefile or Gemfile? And once that's decided, which gist code above do I use? If I use Gemfile are my build commands now make build and make serve?

My public repo: https://github.com/funraise-af/jekyll-bootstrap4
The closest I got was jquery.min.js being generated in the /assets/vendor/ folder, but jQuery does not get removed from the _site folder.

Any help would be greatly appreciated!