chore: make eslint happy

src/test-utils/setup-jest.ts

@@ -3,10 +3,11 @@ import '@testing-library/jest-dom';
 // FIXME: Use something like jsdom-worker?
 //   see: https://github.com/developit/jsdom-worker
 if (!global.Worker) {
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
   (global as any).Worker = class MockWorker {
     events: Record<string, (e: unknown) => void> = Object.create(null);
 
-    onmessage?: () => {};
+    onmessage = undefined;
     addEventListener(name: string, e: unknown) {
       if (Object.hasOwn(this.events, name)) {
         this.events[name](e);

src/test-utils/test-helper.tsx

@@ -6,6 +6,7 @@ import { AppStore, RootState, setupStore } from '~/store';
 
 // Adapted from: https://redux.js.org/usage/writing-tests
 
+// eslint-disable-next-line react-refresh/only-export-components
 export * from '@testing-library/react';
 
 export interface ExtendedRenderOptions extends RenderOptions {
@@ -17,7 +18,7 @@ export function renderWithProviders(
   ui: React.ReactElement,
   { preloadedState = {}, store = setupStore(preloadedState), ...renderOptions }: ExtendedRenderOptions = {}
 ) {
-  function Wrapper({ children }: PropsWithChildren<{}>): JSX.Element {
+  function Wrapper({ children }: PropsWithChildren<unknown>): JSX.Element {
     return <Provider store={store}>{children}</Provider>;
   }