Add option to config for watching external files. example `tailwind/backgrounds.js` ``` module.exports = { backgroundSize: { auto: 'auto', cover: 'cover', contain: 'contain' } } ``` `tailwind.config` ``` const { backgroundSize } = require('./tailwind/backgrounds') module.exports = { backgroundSize, options: { watch: 'tailwind/**.js' } } ``` Cheers