Fix error banner store updates

src/lib/components/ErrorBannerStore.ts

@@ -24,38 +24,35 @@ function createBanner(message: string, type: ErrorType, duration = 5000): Banner
     };
 }
 
-export function addError(message: string, type: ErrorType = 'error', duration?: number) {
-    return errorBanners.update(banners => {
-        const banner = createBanner(message, type, duration);
-        return [...banners, banner];
-    });
-}
-
-export function addErrorSuccess(message: string) {
-    return addError(message, 'success', 3000);
-}
-
-export function addErrorWarning(message: string) {
-    return addError(message, 'warning', 5000);
-}
-
-export function addErrorFatal(message: string) {
-    return addError(message, 'fatal', 0);
-}
-
-export function addErrorInfo(message: string) {
-    return addError(message, 'info', 4000);
-}
-
 function createErrorBannerStore() {
     const { subscribe, update } = writable<BannerMessage[]>([]);
 
+    function addError(message: string, type: ErrorType = 'error', duration?: number) {
+        update(banners => [...banners, createBanner(message, type, duration)]);
+    }
+
+    function addErrorSuccess(message: string) {
+        addError(message, 'success', 3000);
+    }
+
+    function addErrorWarning(message: string) {
+        addError(message, 'warning', 5000);
+    }
+
+    function addErrorFatal(message: string) {
+        addError(message, 'fatal', 0);
+    }
+
+    function addErrorInfo(message: string) {
+        addError(message, 'info', 4000);
+    }
+
     function dismiss(id: string) {
         update(banners => banners.filter(b => b.id !== id));
     }
 
     function clearAll() {
-        update([]);
+        update(() => []);
     }
 
     return {