message: configure rollup to provide named exports from theme.js
diff: @@ -18,7 +18,11 @@ export default {
  'react'
  ]
  }),
  - commonjs()
  + commonjs({
  + namedExports: {
  + 'src/theme.js': ['breakpoints', 'colors']
  + }
  + })
  ],
  output: formats.map(format => ({
  file: `dist/index.${format}.js`,
  