Migrate backgroundImage

Author: adamwathan

src/corePlugins/backgroundColor.js

@@ -18,15 +18,13 @@ module.exports = function ({ jit: { theme, addUtilities, addVariant, e } }) {
           return []
         }
 
-        return [
-          {
-            [nameClass('bg', modifier)]: withAlphaVariable({
-              color: value,
-              property: 'background-color',
-              variable: '--tw-bg-opacity',
-            }),
-          },
-        ]
+        return {
+          [nameClass('bg', modifier)]: withAlphaVariable({
+            color: value,
+            property: 'background-color',
+            variable: '--tw-bg-opacity',
+          }),
+        }
       }),
     ],
   })

src/corePlugins/backgroundImage.js

@@ -1,17 +1,18 @@
 const nameClass = require('tailwindcss/lib/util/nameClass').default
+const { newFormat } = require('../pluginUtils')
 
 module.exports = function ({ jit: { theme, addUtilities, addVariant, e } }) {
   addUtilities({
     bg: [
-      (modifier, { theme }) => {
+      newFormat((modifier, { theme }) => {
         let value = theme.backgroundImage[modifier]
 
         if (value === undefined) {
           return []
         }
 
-        return [[nameClass('bg', modifier), { 'background-image': value }]]
-      },
+        return { [nameClass('bg', modifier)]: { 'background-image': value } }
+      }),
     ],
   })
 }