renaming backend, cellxgene to server, client respectively

client/src/reducers/expression.js

@@ -0,0 +1,33 @@
+// jshint esversion: 6
+const Expression = (
+  state = {
+    data: null,
+    loading: null,
+    error: null
+  },
+  action
+) => {
+  switch (action.type) {
+    case "get expression started":
+      return Object.assign({}, state, {
+        loading: true,
+        error: null
+      });
+    case "get expression success":
+      return Object.assign({}, state, {
+        error: null,
+        loading: false,
+        data: action.data.data
+      });
+    case "get expression error":
+      return Object.assign({}, state, {
+        data: null,
+        loading: false,
+        error: action.data
+      });
+    default:
+      return state;
+  }
+};
+
+export default Expression;