1 files changed, 21 insertions, 0 deletions
diff --git a/devtools/client/memory/reducers/census-display.js b/devtools/client/memory/reducers/census-display.js
new file mode 100644
index 000000000..83535a201
--- /dev/null
+++ b/devtools/client/memory/reducers/census-display.js
@@ -0,0 +1,21 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+const { actions, censusDisplays } = require("../constants");
+const DEFAULT_CENSUS_DISPLAY = censusDisplays.coarseType;
+
+let handlers = Object.create(null);
+
+handlers[actions.SET_CENSUS_DISPLAY] = function (_, { display }) {
+  return display;
+};
+
+module.exports = function (state = DEFAULT_CENSUS_DISPLAY, action) {
+  let handle = handlers[action.type];
+  if (handle) {
+    return handle(state, action);
+  }
+  return state;
+};