Migrating the video overlay in Svelte (WIP)

front/src/Stores/GameOverlayStoreVisibility.ts

@@ -0,0 +1,17 @@
+import {writable} from "svelte/store";
+
+/**
+ * A store that contains whether the game overlay is shown or not.
+ * Typically, the overlay is hidden when entering Jitsi meet.
+ */
+function createGameOverlayVisibilityStore() {
+    const { subscribe, set, update } = writable(false);
+
+    return {
+        subscribe,
+        showGameOverlay: () => set(true),
+        hideGameOverlay: () => set(false),
+    };
+}
+
+export const gameOverlayVisibilityStore = createGameOverlayVisibilityStore();