Upgrade PostCSS to 6.0.* (vuejs#176)

* Update PostCSS to ^6.0.*

* De-indent package.json

* Undo package.json formatting

Author: Jeff Berry

package.json

@@ -43,10 +43,10 @@
     "magic-string": "^0.22.4",
     "merge-options": "^1.0.0",
     "parse5": "^3.0.3",
-    "postcss": "^5.2.11",
+    "postcss": "^6.0.19",
     "postcss-load-config": "^1.2.0",
-    "postcss-modules": "^0.6.4",
-    "postcss-selector-parser": "^2.2.3",
+    "postcss-modules": "^1.1.0",
+    "postcss-selector-parser": "^3.1.1",
     "posthtml": "^0.10.1",
     "posthtml-attrs-parser": "^0.1.1",
     "rollup-pluginutils": "^2.0.1",
@@ -83,7 +83,7 @@
     "coffeescript-compiler": "^0.1.1",
     "less": "^2.7.2",
     "node-sass": "^4.5.0",
-    "pug": "^2.0.0-beta11",
+    "pug": "^2.0.1",
     "stylus": "^0.54.5"
   },
   "peerDependencies": {

src/style/css.js

@@ -63,7 +63,9 @@ const addScopeID = postcss.plugin('add-scope-id', ({ scopeID }) => {
 
     return root => {
         root.walkRules(rule => {
-            rule.selector = selectorTransformer.process(rule.selector).result
+            selectorTransformer.processSync(rule, {
+                updateSelector: true
+            })
         })
     }
 })
@@ -100,7 +102,7 @@ export default async function (promise, options) {
     const hasModule = style.module === true
     const hasScope = style.scoped === true
     const postcssConfig = await postcssLoadConfig(options.postcss)
-    const plugins = postcssConfig.plugins || []
+    const plugins = [...postcssConfig.plugins] || []
     let processPromise = Promise.resolve()
 
     if (hasScope) {

src/vueTransform.js

@@ -149,7 +149,7 @@ async function processStyle (styles, id, content, options) {
 
         const map = (new MagicString(code)).generateMap({ hires: true })
 
-        const output = {
+        let output = {
             id,
             code: code,
             map: map,
@@ -158,7 +158,11 @@ async function processStyle (styles, id, content, options) {
             scoped: 'scoped' in style.attrs
         }
 
-        outputs.push(options.autoStyles || output.scoped || output.module ? await compile(output, options) : output)
+        if (options.autoStyles || output.scoped || output.module) {
+            output = await compile(output, options)
+        }
+
+        outputs.push(output)
     }
 
     return outputs