Rewrite frontend using create-react-app

config/env.js

@@ -0,0 +1,38 @@
+'use strict';
+
+// Grab NODE_ENV and REACT_APP_* environment variables and prepare them to be
+// injected into the application via DefinePlugin in Webpack configuration.
+
+var REACT_APP = /^REACT_APP_/i;
+
+function getClientEnvironment(publicUrl) {
+  var raw = Object
+    .keys(process.env)
+    .filter(key => REACT_APP.test(key))
+    .reduce((env, key) => {
+      env[key] = process.env[key];
+      return env;
+    }, {
+      // Useful for determining whether we’re running in production mode.
+      // Most importantly, it switches React into the correct mode.
+      'NODE_ENV': process.env.NODE_ENV || 'development',
+      // Useful for resolving the correct path to static assets in `public`.
+      // For example, <img src={process.env.PUBLIC_URL + '/img/logo.png'} />.
+      // This should only be used as an escape hatch. Normally you would put
+      // images into the `src` and `import` them in code to get their paths.
+      'PUBLIC_URL': publicUrl
+    });
+  // Stringify all values so we can feed into Webpack DefinePlugin
+  var stringified = {
+    'process.env': Object
+      .keys(raw)
+      .reduce((env, key) => {
+        env[key] = JSON.stringify(raw[key]);
+        return env;
+      }, {})
+  };
+
+  return { raw, stringified };
+}
+
+module.exports = getClientEnvironment;