diff --git a/.oxlintrc.json b/.oxlintrc.json
index aae4b03..4417162 100644
--- a/.oxlintrc.json
+++ b/.oxlintrc.json
@@ -37,9 +37,14 @@
     "react/self-closing-comp": "warn",
 
     "import/no-duplicates": "error",
+    "import/no-unassigned-import": ["error", {
+      "allow": ["**/*.css", "@testing-library/jest-dom", "@testing-library/cypress/add-commands"]
+    }],
 
     "no-shadow": "error",
-    "unicorn/consistent-function-scoping": "error"
+    "unicorn/consistent-function-scoping": "error",
+    "unicorn/prefer-add-event-listener": "error",
+    "unicorn/require-module-specifiers": "error"
   },
   "overrides": [
     {
diff --git a/app/hooks/useDraftNotifications.ts b/app/hooks/useDraftNotifications.ts
index 7952c81..036eea0 100644
--- a/app/hooks/useDraftNotifications.ts
+++ b/app/hooks/useDraftNotifications.ts
@@ -44,18 +44,20 @@ export function useDraftNotifications(seasonId: string, userId: string) {
     // would still be null at that point without the flag).
     let aborted = false;
     let permissionStatus: PermissionStatus | null = null;
+    let changeHandler: (() => void) | null = null;
     navigator.permissions
       .query({ name: "notifications" })
       .then((status) => {
         if (aborted) return;
         permissionStatus = status;
-        status.onchange = () => {
+        changeHandler = () => {
           setPermissionState(status.state as NotificationPermission);
           // If permission was revoked, disable notifications
           if (status.state !== "granted") {
             setEnabledState(false);
           }
         };
+        status.addEventListener("change", changeHandler);
       })
       .catch(() => {
         // Permissions API not available in all environments; silently ignore
@@ -63,8 +65,8 @@ export function useDraftNotifications(seasonId: string, userId: string) {
 
     return () => {
       aborted = true;
-      if (permissionStatus) {
-        permissionStatus.onchange = null;
+      if (permissionStatus && changeHandler) {
+        permissionStatus.removeEventListener("change", changeHandler);
       }
     };
   }, [seasonId, userId]);
@@ -120,7 +122,7 @@ export function useDraftNotifications(seasonId: string, userId: string) {
         body,
         tag: `draft-${seasonId}`,
       });
-      n.onclick = () => window.focus();
+      n.addEventListener("click", () => window.focus());
     },
     [enabled, seasonId]
   );
diff --git a/app/routes/admin.data-sync.tsx b/app/routes/admin.data-sync.tsx
index 5cd41b7..69557e8 100644
--- a/app/routes/admin.data-sync.tsx
+++ b/app/routes/admin.data-sync.tsx
@@ -139,14 +139,14 @@ export default function DataSync({ loaderData }: Route.ComponentProps) {
     }
 
     const reader = new FileReader();
-    reader.onload = (event) => {
+    reader.addEventListener("load", (event) => {
       const fileData = event.target?.result as string;
       const formData = new FormData();
       formData.append("intent", "import");
       formData.append("mode", importMode);
       formData.append("fileData", fileData);
       fetcher.submit(formData, { method: "POST" });
-    };
+    });
     reader.readAsText(selectedFile);
   };
 
diff --git a/cypress/support/e2e.ts b/cypress/support/e2e.ts
index e8d4e2d..beb10f7 100644
--- a/cypress/support/e2e.ts
+++ b/cypress/support/e2e.ts
@@ -19,4 +19,3 @@ declare global {
   }
 }
 
-export {};