Conform more code to strict null checking (#10169)

* Conform more code to strict null checking

* delint

* Iterate

* delint

* Fix bad test

test/components/views/settings/devices/DeviceDetails-test.tsx

@@ -30,7 +30,6 @@ describe("<DeviceDetails />", () => {
     };
     const defaultProps: ComponentProps<typeof DeviceDetails> = {
         device: baseDevice,
-        pusher: null,
         isSigningOut: false,
         onSignOutDevice: jest.fn(),
         saveDeviceName: jest.fn(),

test/components/views/settings/devices/SelectableDeviceTile-test.tsx

@@ -53,7 +53,7 @@ describe("<SelectableDeviceTile />", () => {
         const { container } = render(getComponent({ onSelect }));
 
         act(() => {
-            fireEvent.click(container.querySelector(`#device-tile-checkbox-${device.device_id}`));
+            fireEvent.click(container.querySelector(`#device-tile-checkbox-${device.device_id}`)!);
         });
 
         expect(onSelect).toHaveBeenCalled();

test/components/views/settings/devices/deleteDevices-test.tsx

@@ -92,7 +92,7 @@ describe("deleteDevices()", () => {
         // opened modal
         expect(modalSpy).toHaveBeenCalled();
 
-        const [, { title, authData, aestheticsForStagePhases }] = modalSpy.mock.calls[0];
+        const { title, authData, aestheticsForStagePhases } = modalSpy.mock.calls[0][1]!;
 
         // modal opened as expected
         expect(title).toEqual("Authentication");