first commit

web/core/postcss.config.js

@@ -0,0 +1,20 @@
+module.exports = ctx => ({
+  map: !ctx.env || ctx.env !== 'production' ? { inline: false } : false,
+  plugins: [
+    require('postcss-custom-properties')({
+      preserve: false,
+      // Breaks style lint and unnecessary if preserve set to false.
+      // exportTo: 'dist-css/variables.css',
+      importFrom: [
+        './themes/claro/css/src/base/variables.css'
+      ]
+    }),
+    require("postcss-calc"),
+    require('autoprefixer')({
+      cascade: false
+    }),
+    require('postcss-header')({
+      header: `DO NOT EDIT THIS FILE.\nSee the following change record for more information,\nhttps://www.drupal.org/node/2815083\n@preserve`,
+    }),
+  ]
+});