Setup PostCSS

package.json

@@ -11,9 +11,18 @@
     "type": "git",
     "url": "git://github.com/cartodb/CartoAssets.git"
   },
-  "license":  "MIT",
+  "license": "MIT",
   "devDependencies": {
-    "perfect-scrollbar": "git://github.com/CartoDB/perfect-scrollbar.git#master"
+    "perfect-scrollbar": "git://github.com/CartoDB/perfect-scrollbar.git#master",
+    "postcss": "^5.2.8",
+    "postcss-browser-reporter": "^0.5.0",
+    "postcss-cli": "^2.6.0",
+    "postcss-cssnext": "^2.9.0",
+    "postcss-import": "^9.0.0",
+    "postcss-reporter": "^3.0.0"
+  },
+  "scripts": {
+    "build": "postcss -c postcss.config.js"
   },
   "keywords": [
     "library",

postcss.config.js

@@ -0,0 +1,26 @@
+const POSTCSS = {
+  'input': 'src/entry.css',
+  'output': 'dist/carto_assets.css',
+  'use': [
+    'postcss-import',
+    'postcss-cssnext'
+    // 'postcss-browser-reporter',
+    // 'postcss-reporter'
+  ],
+  'postcss-import': {
+    path: ['src']
+  },
+  'cssnano': {
+    safe: true,
+    autoprefixer: false //handled by postcss-cssnext
+  },
+  'local-plugins': true,
+  'map': 'file'
+}
+
+if (process.env.NODE_ENV === 'production') {
+  POSTCSS.use.push('cssnano'); // add cssnano in production
+  POSTCSS.map = false; //sourcemaps to external file
+}
+
+module.exports = POSTCSS;