npm install -g babel-cli

cd /test/test-react/test-precompile
npm init
npm install --save-dev babel-preset-es2015 babel-preset-react
npm ls --depth=0

# cat src/hello.js
babel --presets es2015,react src/ --out-dir lib/
# cat lib/hello.js
babel --presets es2015,react --watch src/ --out-dir lib/