TWNTY-3794 - ESLint rule: only take explicit boolean predicates in if statements (#4354)

* ESLint rule: only take explicit boolean predicates in if statements

Co-authored-by: v1b3m <vibenjamin6@gmail.com>
Co-authored-by: Toledodev <rafael.toledo@engenharia.ufjf.br>

* Merge main

Co-authored-by: v1b3m <vibenjamin6@gmail.com>
Co-authored-by: Toledodev <rafael.toledo@engenharia.ufjf.br>

* Fix frontend linter errors

Co-authored-by: v1b3m <vibenjamin6@gmail.com>
Co-authored-by: Toledodev <rafael.toledo@engenharia.ufjf.br>

* Fix jest

Co-authored-by: v1b3m <vibenjamin6@gmail.com>
Co-authored-by: Toledodev <rafael.toledo@engenharia.ufjf.br>

* Refactor according to review

Co-authored-by: v1b3m <vibenjamin6@gmail.com>
Co-authored-by: Toledodev <rafael.toledo@engenharia.ufjf.br>

* Refactor according to review

Co-authored-by: v1b3m <vibenjamin6@gmail.com>
Co-authored-by: Toledodev <rafael.toledo@engenharia.ufjf.br>

* Fix lint on new code

Co-authored-by: v1b3m <vibenjamin6@gmail.com>
Co-authored-by: Toledodev <rafael.toledo@engenharia.ufjf.br>

---------

Co-authored-by: gitstart-twenty <gitstart-twenty@users.noreply.github.com>
Co-authored-by: v1b3m <vibenjamin6@gmail.com>
Co-authored-by: Toledodev <rafael.toledo@engenharia.ufjf.br>

packages/twenty-front/src/modules/activities/calendar/utils/sortCalendarEvents.ts

@@ -1,4 +1,5 @@
 import { CalendarEvent } from '@/activities/calendar/types/CalendarEvent';
+import { isNonNullable } from '~/utils/isNonNullable';
 import { sortAsc } from '~/utils/sort';
 
 export const sortCalendarEventsAsc = (
@@ -10,7 +11,11 @@ export const sortCalendarEventsAsc = (
     calendarEventB.startsAt.getTime(),
   );
 
-  if (startsAtSort === 0 && calendarEventA.endsAt && calendarEventB.endsAt) {
+  if (
+    startsAtSort === 0 &&
+    isNonNullable(calendarEventA.endsAt) &&
+    isNonNullable(calendarEventB.endsAt)
+  ) {
     return sortAsc(
       calendarEventA.endsAt.getTime(),
       calendarEventB.endsAt.getTime(),