Port backgroundColors module to plugin

src/defaultPlugins.js

@@ -1,3 +1,4 @@
+import backgroundColors from './plugins/backgroundColors'
 import backgroundPosition from './plugins/backgroundPosition'
 import backgroundRepeat from './plugins/backgroundRepeat'
 import backgroundSize from './plugins/backgroundSize'
@@ -47,6 +48,7 @@ import zIndex from './plugins/zIndex'
 
 export default function (config) {
   return [
+    config.modules.backgroundColors === false ? () => {} : backgroundColors(),
     config.modules.backgroundPosition === false ? () => {} : backgroundPosition(),
     config.modules.backgroundRepeat === false ? () => {} : backgroundRepeat(),
     config.modules.backgroundSize === false ? () => {} : backgroundSize(),

src/generators/backgroundColors.js

@@ -1,10 +0,0 @@
-import _ from 'lodash'
-import defineClass from '../util/defineClass'
-
-export default function({ backgroundColors }) {
-  return _.map(backgroundColors, (color, className) => {
-    return defineClass(`bg-${className}`, {
-      'background-color': color,
-    })
-  })
-}

src/plugins/backgroundColors.js

@@ -0,0 +1,13 @@
+import _ from 'lodash'
+
+export default function () {
+  return function ({ addUtilities, config, e }) {
+    const utilities = _.fromPairs(_.map(config('backgroundColors'), (value, modifier) => {
+      return [`.${e(`bg-${modifier}`)}`, {
+        'background-color': value,
+      }]
+    }))
+
+    addUtilities(utilities, config('modules.backgroundColors'))
+  }
+}

src/utilityModules.js

@@ -1,11 +1,9 @@
 import lists from './generators/lists'
 import appearance from './generators/appearance'
 import backgroundAttachment from './generators/backgroundAttachment'
-import backgroundColors from './generators/backgroundColors'
 
 export default [
   { name: 'lists', generator: lists },
   { name: 'appearance', generator: appearance },
   { name: 'backgroundAttachment', generator: backgroundAttachment },
-  { name: 'backgroundColors', generator: backgroundColors },
 ]