Turned the PaleteBlock into an IIFE

js/FeatureToggles.js

@@ -0,0 +1,33 @@
+const featureToggles = (function featureTogglesModule() {
+
+    const ellipseToolLocalStorageKey = 'feature_ellipseTool';
+
+    return {
+        onLoad: () => {
+            updateEllipseToolVisibility()
+        },
+        enableEllipseTool,
+        disableEllipseTool
+    }
+
+    ////////
+
+    function updateEllipseToolVisibility() {
+        // TODO: [ELLIPSE] Once ellipse is ready for release make it enabled by default
+        const isEllipseToolEnabled = (window.localStorage.getItem(ellipseToolLocalStorageKey) === "yes") || false;
+        const ellipseToolElement = document.getElementById("tools-menu--ellipse");
+        ellipseToolElement.style.display = isEllipseToolEnabled ? 'block' : 'none';
+    }
+
+    function enableEllipseTool() {
+        window.localStorage.setItem(ellipseToolLocalStorageKey, "yes");
+        updateEllipseToolVisibility();
+    }
+
+    function disableEllipseTool() {
+        window.localStorage.setItem(ellipseToolLocalStorageKey, "no");
+        updateEllipseToolVisibility();
+    }
+
+})();
+