Refactor duplication

src/util/generateUtilities.js

@@ -0,0 +1,24 @@
+import _ from 'lodash'
+import postcss from 'postcss'
+import utilityModules from '../utilityModules'
+import prefixTree from '../util/prefixTree'
+import generateModules from '../util/generateModules'
+
+export default function(config, pluginUtilities) {
+  const utilities = generateModules(utilityModules, config.modules, config)
+
+  if (config.options.important) {
+    utilities.walkDecls(decl => (decl.important = true))
+  }
+
+  const tailwindUtilityTree = postcss.root({
+    nodes: utilities.nodes,
+  })
+
+  prefixTree(tailwindUtilityTree, config.options.prefix)
+
+  return _.tap(postcss.root(), root => {
+    root.append(tailwindUtilityTree.nodes)
+    root.append(pluginUtilities)
+  })
+}