fixes

Author: vasia

lib/compilers/postcss-compiler.js

@@ -17,6 +17,7 @@ function hasAsyncPlugin () {
 
   if (result.processing) {
     prevCheckIsAsync = true
+    return prevCheckIsAsync
   }
   for (const plugin of result.processor.plugins) {
     const promise = result.run(plugin)

package.json

@@ -46,7 +46,10 @@
     "jade": "^1.11.0",
     "jest": "^20.0.4",
     "node-sass": "^4.10.0",
+    "postcss": "^7.0.18",
     "postcss-css-variables": "^0.13.0",
+    "postcss-load-config": "^2.1.0",
+    "postcss-nested": "^4.1.2",
     "pug": "^2.0.0-rc.3",
     "stylus": "^0.54.5",
     "typescript": "^2.5.2",
@@ -67,9 +70,6 @@
     "js-beautify": "^1.6.14",
     "node-cache": "^4.1.1",
     "object-assign": "^4.1.1",
-    "postcss": "^7.0.17",
-    "postcss-load-config": "^2.1.0",
-    "postcss-nested": "^4.1.2",
     "source-map": "^0.5.6",
     "tsconfig": "^7.0.0",
     "vue-template-es2015-compiler": "^1.6.0"