diff --git a/ui/src/components/bulma/Toast.vue b/ui/src/components/bulma/Toast.vue
index cd5d985..5fb3525 100644
--- a/ui/src/components/bulma/Toast.vue
+++ b/ui/src/components/bulma/Toast.vue
@@ -25,7 +25,7 @@ const message = useTemplateRef("message");
 onMounted(() =>
   emit("handle", {
     show(options: ToastOptions = {}) {
-      if (!(message.value instanceof HTMLElement)) return;
+      if (message.value === null) return;
 
       toast({
         ...options,
diff --git a/ui/src/components/calendar/SVGRect.vue b/ui/src/components/calendar/SVGRect.vue
index ed4f205..7e96918 100644
--- a/ui/src/components/calendar/SVGRect.vue
+++ b/ui/src/components/calendar/SVGRect.vue
@@ -20,7 +20,7 @@
 </template>
 
 <script setup lang="ts">
-import { VueLike, loading_success } from "@/lib/helpers";
+import { VueLike, unwrap_loading } from "@/lib/helpers";
 import { Rectangle } from "@/lib/rects/rectangle";
 import { advent22Store } from "@/lib/store";
 import { computed } from "vue";
@@ -47,9 +47,11 @@ withDefaults(
 );
 
 const aspect_ratio = computed(() => {
-  if (!loading_success(store.background_image)) return 1;
-
-  return store.background_image.aspect_ratio;
+  try {
+    return unwrap_loading(store.background_image).aspect_ratio;
+  } catch {
+    return 1;
+  }
 });
 </script>
 
diff --git a/ui/src/components/calendar/ThouCanvas.vue b/ui/src/components/calendar/ThouCanvas.vue
index f3c5eba..89cc816 100644
--- a/ui/src/components/calendar/ThouCanvas.vue
+++ b/ui/src/components/calendar/ThouCanvas.vue
@@ -29,21 +29,23 @@ function get_event_thous(event: MouseEvent): Vector2D {
   );
 }
 
+type TCEventType = "mousedown" | "mousemove" | "mouseup" | "click" | "dblclick";
+
+const is_tceventtype = (t: unknown): t is TCEventType =>
+  t === "mousedown" ||
+  t === "mousemove" ||
+  t === "mouseup" ||
+  t === "click" ||
+  t === "dblclick";
+
 const emit = defineEmits<{
-  (event: "mousedown", e: MouseEvent, point: Vector2D): void;
-  (event: "mouseup", e: MouseEvent, point: Vector2D): void;
-  (event: "mousemove", e: MouseEvent, point: Vector2D): void;
-  (event: "click", e: MouseEvent, point: Vector2D): void;
-  (event: "dblclick", e: MouseEvent, point: Vector2D): void;
+  (event: TCEventType, e: MouseEvent, point: Vector2D): void;
 }>();
 
 function transform_mouse_event(event: MouseEvent) {
-  const point = get_event_thous(event);
+  if (!is_tceventtype(event.type)) return;
 
-  // mute a useless typescript error
-  const event_type = event.type as "mousedown";
-
-  emit(event_type, event, point);
+  emit(event.type, event, get_event_thous(event));
 }
 </script>
 
diff --git a/ui/src/lib/helpers.ts b/ui/src/lib/helpers.ts
index cd6fcf3..36bff86 100644
--- a/ui/src/lib/helpers.ts
+++ b/ui/src/lib/helpers.ts
@@ -20,29 +20,22 @@ export function unwrap_vuelike<T>(value: VueLike<T>): T {
 
 export type Loading<T> = T | "loading" | "error";
 
-export function loading_success<T>(o: Loading<T>): o is T {
-  if (o === "loading") return false;
-  if (o === "error") return false;
-
-  return true;
-}
-
 export function unwrap_loading<T>(o: Loading<T>): T {
-  if (!loading_success(o)) throw null;
+  if (o === "loading" || o === "error") throw null;
 
   return o;
 }
 
 export function wait_for(condition: () => boolean, action: () => void) {
-  const do_action = () => {
+  const enqueue_action = () => {
     if (!condition()) {
-      nextTick(do_action);
+      nextTick(enqueue_action);
       return;
     }
 
     action();
   };
-  do_action();
+  enqueue_action();
 }
 
 export function handle_error(error: unknown) {