1 files changed, 42 insertions, 0 deletions
diff --git a/webapp/store/utils.js b/webapp/store/utils.js
new file mode 100644
index 000000000..5566f54b8
--- /dev/null
+++ b/webapp/store/utils.js
@@ -0,0 +1,42 @@
+// Copyright (c) 2017 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+function transformFromSet(incoming) {
+    const state = {...incoming};
+
+    for (const key in state) {
+        if (state.hasOwnProperty(key)) {
+            if (state[key] instanceof Set) {
+                state[key] = Array.from([...state[key]]);
+            }
+        }
+    }
+
+    return state;
+}
+
+function transformToSet(incoming) {
+    const state = {...incoming};
+
+    for (const key in state) {
+        if (state.hasOwnProperty(key)) {
+            state[key] = new Set(state[key]);
+        }
+    }
+
+    return state;
+}
+
+export function transformSet(incoming, setTransforms, toStorage = true) {
+    const state = {...incoming};
+
+    const transformer = toStorage ? transformFromSet : transformToSet;
+
+    for (const key in state) {
+        if (state.hasOwnProperty(key) && setTransforms.includes(key)) {
+            state[key] = transformer(state[key]);
+        }
+    }
+
+    return state;
+}