add purge-config loader

config/default.json

@@ -871,5 +871,16 @@
   },
   "varnish": {
     "enabled":false
-  }
+  },
+  "purgeConfig": [
+    "server.invalidateCacheKey",
+    "server.invalidateCacheForwardUrl",
+    "server.trace",
+    "redis",
+    "install",
+    "expireHeaders",
+    "fastly",
+    "nginx",
+    "varnish"
+  ]
 }

core/build/purge-config.js

@@ -0,0 +1,16 @@
+const omit = require('lodash/omit')
+
+/**
+ * clear config properties that shouldn't be visible on frontend
+ */
+module.exports = function loader(source) {
+  let config = JSON.parse(source);
+
+  const purgeConfig = (config.purgeConfig || []).slice()
+
+  config = omit(config, purgeConfig)
+
+  delete config['purgeConfig']
+
+  return JSON.stringify(config);
+}

core/build/webpack.base.config.ts

@@ -193,6 +193,10 @@ export default {
         test: /\.(graphqls|gql)$/,
         exclude: /node_modules/,
         loader: ['graphql-tag/loader']
+      },
+      {
+        test: /core\/build\/config\.json$/,
+        loader: path.resolve('core/build/purge-config.js')
       }
     ]
   }