Find files not used in the app bundle, i.e. unused source code

react-unused-files.sh

#!/bin/bash

# Launch inside a react project after building the production build with webpack
# Require `jq`.

diff \
	<(find src -type f \( -name '*.js' -o -name '*.jsx' -o -name '*.scss' \) | sort) \
	<(cat dist/**/*.map | jq --raw-output '.sources | join("\n")' \
		| grep -v '\.\./' | grep -E '\.(js|jsx|scss)$' \
		| sed "s~^webpack:///\./~~" -r | sort | uniq) \
	| grep '< ' | sed "s#^< ##" | grep -v 'spec'