Merge 6a34874 into fda5f4a

.travis.yml

@@ -1,9 +1,9 @@
 language: node_js
 
 node_js:
-  - 'stable'
-  - 'lts/*'
-  - 6
+  - stable
+  - "12"
+  - "10"
 
 script: npm run lint && npm t
 

appveyor.yml

@@ -19,5 +19,5 @@ test_script:
 environment:
   matrix:
     - nodejs_version: 'stable'
-    - nodejs_version: 'lts'
-    - nodejs_version: '6'
+    - nodejs_version: '12'
+    - nodejs_version: '10'

package.json

@@ -24,12 +24,12 @@
     "cssnano": "^4.0.0",
     "jest": "^24.0.0",
     "jsdoc-to-markdown": "^5.0.0",
-    "postcss": "^7.0.0",
+    "postcss": "^8.0.5",
     "postcss-import": "^12.0.0",
-    "postcss-nested": "^4.0.0",
+    "postcss-nested": "^5.0.0",
     "standard": "^12.0.0",
     "standard-version": "6.0.0",
-    "sugarss": "^2.0.0"
+    "sugarss": "^3.0.0"
   },
   "keywords": [
     "postcss",

src/plugins.js

@@ -56,18 +56,23 @@ const plugins = (config, file) => {
 
   if (plugins.length && plugins.length > 0) {
     plugins.forEach((plugin, i) => {
-      if (plugin.postcss) {
-        plugin = plugin.postcss
-      }
-
       if (plugin.default) {
         plugin = plugin.default
       }
 
+      if (plugin.postcss === true) {
+        plugin = plugin()
+      } else if (plugin.postcss) {
+        plugin = plugin.postcss
+      }
+
       if (
         // eslint-disable-next-line
-        !(typeof plugin === 'object' && Array.isArray(plugin.plugins) ||
-        typeof plugin === 'function')
+        !(
+          (typeof plugin === 'object' && Array.isArray(plugin.plugins)) ||
+          (typeof plugin === 'object' && plugin.postcssPlugin) ||
+          (typeof plugin === 'function')
+        )
       ) {
         throw new TypeError(`Invalid PostCSS Plugin found at: plugins[${i}]\n\n(@${file})`)
       }

test/js.test.js

@@ -85,7 +85,7 @@ describe('postcss.config.js - {Array} - Load Config', () => {
 
     expect(config.plugins.length).toEqual(2)
     expect(typeof config.plugins[0]).toBe('function')
-    expect(typeof config.plugins[1]).toBe('function')
+    expect(typeof config.plugins[1]).toBe('object')
 
     expect(config.file)
       .toEqual(path.resolve('test/js/array', 'postcss.config.js'))