Rename themes -> flavours ? ?

app/javascript/flavours/glitch/middleware/errors.js

@@ -0,0 +1,31 @@
+import { showAlert } from 'flavours/glitch/actions/alerts';
+
+const defaultFailSuffix = 'FAIL';
+
+export default function errorsMiddleware() {
+  return ({ dispatch }) => next => action => {
+    if (action.type && !action.skipAlert) {
+      const isFail = new RegExp(`${defaultFailSuffix}$`, 'g');
+
+      if (action.type.match(isFail)) {
+        if (action.error.response) {
+          const { data, status, statusText } = action.error.response;
+
+          let message = statusText;
+          let title   = `${status}`;
+
+          if (data.error) {
+            message = data.error;
+          }
+
+          dispatch(showAlert(title, message));
+        } else {
+          console.error(action.error);
+          dispatch(showAlert('Oops!', 'An unexpected error occurred.'));
+        }
+      }
+    }
+
+    return next(action);
+  };
+};