monad-one · March 1, 2018 03:11
diff --git a/Makefile b/Makefile
 # Makefile for transpiling with Babel in a Node app, or in a client- or
 # server-side shared library.

 .PHONY: all build clean

 # Install `babel-cli` in a project to get the transpiler.
 babel := node_modules/.bin/babel

 # Identify modules to be transpiled by finding files ending in `.js.flow`.
 src_files := $(shell find . -name '*.js.flow' -not -path './node_modules/*')

 # Build list of expected output files by changing `.js.flow` to `.js` in
 # `src_files` list. Generated files are put in the same directory as the source
 # file. Because we generate the list in this way, we can selectively remove
 # generated files in the `clean` target. Modules that should be excluded from
 # transpiling (`.js` files with no corresponding `.js.flow` file) are excluded
 # from this list, so they are not overwritten when running `make`, and are not
 # removed when running `make clean`.
 out_files := $(patsubst %.js.flow,%.js,$(src_files))

 # Putting each generated file in the same directory with its corresponding
 # source file is important when working with Flow: during type-checking Flow
 # will look in npm packages for `.js.flow` files to find type definitions. So
 # putting `.js` and `.js.flow` files side-by-side is how you export type
 # definitions from a shared library.

 # We also want to build a list of `.js.map` output files, so that we can remove
 # them in the `clean` target.
 map_files := $(patsubst %.js.flow,%.js.map,$(src_files))

 all: build

 # Ask `make` to build all of the output `.js` files that we want to produce.
 # This target also depends on the `node_modules/` directory, so that `make`
 # automatically runs `npm install` if `package.json` has changed.
 build: node_modules $(out_files)

 # This rule tells `make` how to turn a `.js.flow` file into a `.js` file.
 # Transpiling one file at a time makes incremental compilation faster:
 # `make` will only transpile source files that have changed since the last
 # invocation.
 %.js: %.js.flow
 	$(babel) $< --out-file $@ --source-maps

 # When cleaning, remove files generated by the `build` target, and nothing else.
 clean:
 	rm -f $(out_files) $(map_files)

 # This rule informs `make` that the `node_modules/` directory is out-of-date
 # after changes to `package.json`, and instructs `make` on how to install
 # modules to get back up-to-date.
 node_modules: package.json
 	npm install
	# Makefile for transpiling with Babel in a Node app, or in a client- or
	# server-side shared library.

	.PHONY: all build clean

	# Install `babel-cli` in a project to get the transpiler.
	babel := node_modules/.bin/babel

	# Identify modules to be transpiled by finding files ending in `.js.flow`.
	src_files := $(shell find . -name '.js.flow' -not -path './node_modules/')

	# Build list of expected output files by changing `.js.flow` to `.js` in
	# `src_files` list. Generated files are put in the same directory as the source
	# file. Because we generate the list in this way, we can selectively remove
	# generated files in the `clean` target. Modules that should be excluded from
	# transpiling (`.js` files with no corresponding `.js.flow` file) are excluded
	# from this list, so they are not overwritten when running `make`, and are not
	# removed when running `make clean`.
	out_files := $(patsubst %.js.flow,%.js,$(src_files))

	# Putting each generated file in the same directory with its corresponding
	# source file is important when working with Flow: during type-checking Flow
	# will look in npm packages for `.js.flow` files to find type definitions. So
	# putting `.js` and `.js.flow` files side-by-side is how you export type
	# definitions from a shared library.

	# We also want to build a list of `.js.map` output files, so that we can remove
	# them in the `clean` target.
	map_files := $(patsubst %.js.flow,%.js.map,$(src_files))

	all: build

	# Ask `make` to build all of the output `.js` files that we want to produce.
	# This target also depends on the `node_modules/` directory, so that `make`
	# automatically runs `npm install` if `package.json` has changed.
	build: node_modules $(out_files)

	# This rule tells `make` how to turn a `.js.flow` file into a `.js` file.
	# Transpiling one file at a time makes incremental compilation faster:
	# `make` will only transpile source files that have changed since the last
	# invocation.
	%.js: %.js.flow
	$(babel) $< --out-file $@ --source-maps

	# When cleaning, remove files generated by the `build` target, and nothing else.
	clean:
	rm -f $(out_files) $(map_files)

	# This rule informs `make` that the `node_modules/` directory is out-of-date
	# after changes to `package.json`, and instructs `make` on how to install
	# modules to get back up-to-date.
	node_modules: package.json
	npm install
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