fix: TS Strict aria C and D

packages/@react-aria/calendar/src/useCalendarCell.ts

@@ -74,7 +74,7 @@ export interface CalendarCellAria {
  */
 export function useCalendarCell(props: AriaCalendarCellProps, state: CalendarState | RangeCalendarState, ref: RefObject<HTMLElement | null>): CalendarCellAria {
   let {date, isDisabled} = props;
-  let {errorMessageId, selectedDateDescription} = hookData.get(state);
+  let {errorMessageId, selectedDateDescription} = hookData.get(state)!;
   let stringFormatter = useLocalizedStringFormatter(intlMessages, '@react-aria/calendar');
   let dateFormatter = useDateFormatter({
     weekday: 'long',
@@ -89,7 +89,7 @@ export function useCalendarCell(props: AriaCalendarCellProps, state: CalendarSta
   isDisabled = isDisabled || state.isCellDisabled(date);
   let isUnavailable = state.isCellUnavailable(date);
   let isSelectable = !isDisabled && !isUnavailable;
-  let isInvalid = state.isValueInvalid && (
+  let isInvalid = state.isValueInvalid && Boolean(
     'highlightedRange' in state
       ? !state.anchorDate && state.highlightedRange && date.compare(state.highlightedRange.start) >= 0 && date.compare(state.highlightedRange.end) <= 0
       : state.value && isSameDay(state.value, date)
@@ -159,7 +159,7 @@ export function useCalendarCell(props: AriaCalendarCellProps, state: CalendarSta
 
   let isAnchorPressed = useRef(false);
   let isRangeBoundaryPressed = useRef(false);
-  let touchDragTimerRef = useRef(null);
+  let touchDragTimerRef = useRef<ReturnType<typeof setTimeout> | undefined>(undefined);
   let {pressProps, isPressed} = usePress({
     // When dragging to select a range, we don't want dragging over the original anchor
     // again to trigger onPressStart. Cancel presses immediately when the pointer exits.
@@ -195,7 +195,7 @@ export function useCalendarCell(props: AriaCalendarCellProps, state: CalendarSta
 
         let startDragging = () => {
           state.setDragging(true);
-          touchDragTimerRef.current = null;
+          touchDragTimerRef.current = undefined;
 
           state.selectDate(date);
           state.setFocusedDate(date);
@@ -215,7 +215,7 @@ export function useCalendarCell(props: AriaCalendarCellProps, state: CalendarSta
       isRangeBoundaryPressed.current = false;
       isAnchorPressed.current = false;
       clearTimeout(touchDragTimerRef.current);
-      touchDragTimerRef.current = null;
+      touchDragTimerRef.current = undefined;
     },
     onPress() {
       // For non-range selection, always select on press up.
@@ -269,7 +269,7 @@ export function useCalendarCell(props: AriaCalendarCellProps, state: CalendarSta
     }
   });
 
-  let tabIndex = null;
+  let tabIndex: number | undefined = undefined;
   if (!isDisabled) {
     tabIndex = isSameDay(date, state.focusedDate) ? 0 : -1;
   }
@@ -298,14 +298,14 @@ export function useCalendarCell(props: AriaCalendarCellProps, state: CalendarSta
     calendar: date.calendar.identifier
   });
 
-  let formattedDate = useMemo(() => cellDateFormatter.formatToParts(nativeDate).find(part => part.type === 'day').value, [cellDateFormatter, nativeDate]);
+  let formattedDate = useMemo(() => cellDateFormatter.formatToParts(nativeDate).find(part => part.type === 'day')!.value, [cellDateFormatter, nativeDate]);
 
   return {
     cellProps: {
       role: 'gridcell',
-      'aria-disabled': !isSelectable || null,
-      'aria-selected': isSelected || null,
-      'aria-invalid': isInvalid || null
+      'aria-disabled': !isSelectable || undefined,
+      'aria-selected': isSelected || undefined,
+      'aria-invalid': isInvalid || undefined
     },
     buttonProps: mergeProps(pressProps, {
       onFocus() {
@@ -315,11 +315,11 @@ export function useCalendarCell(props: AriaCalendarCellProps, state: CalendarSta
       },
       tabIndex,
       role: 'button',
-      'aria-disabled': !isSelectable || null,
+      'aria-disabled': !isSelectable || undefined,
       'aria-label': label,
-      'aria-invalid': isInvalid || null,
+      'aria-invalid': isInvalid || undefined,
       'aria-describedby': [
-        isInvalid ? errorMessageId : null,
+        isInvalid ? errorMessageId : undefined,
         descriptionProps['aria-describedby']
       ].filter(Boolean).join(' ') || undefined,
       onPointerEnter(e) {

packages/@react-aria/calendar/src/useCalendarGrid.ts

@@ -128,7 +128,7 @@ export function useCalendarGrid(props: AriaCalendarGridProps, state: CalendarSta
 
   let visibleRangeDescription = useVisibleRangeDescription(startDate, endDate, state.timeZone, true);
 
-  let {ariaLabel, ariaLabelledBy} = hookData.get(state);
+  let {ariaLabel, ariaLabelledBy} = hookData.get(state)!;
   let labelProps = useLabels({
     'aria-label': [ariaLabel, visibleRangeDescription].filter(Boolean).join(', '),
     'aria-labelledby': ariaLabelledBy
@@ -148,8 +148,8 @@ export function useCalendarGrid(props: AriaCalendarGridProps, state: CalendarSta
   return {
     gridProps: mergeProps(labelProps, {
       role: 'grid',
-      'aria-readonly': state.isReadOnly || null,
-      'aria-disabled': state.isDisabled || null,
+      'aria-readonly': state.isReadOnly || undefined,
+      'aria-disabled': state.isDisabled || undefined,
       'aria-multiselectable': ('highlightedRange' in state) || undefined,
       onKeyDown,
       onFocus: () => state.setFocused(true),

packages/@react-aria/calendar/src/utils.ts

@@ -19,26 +19,26 @@ import {useDateFormatter, useLocalizedStringFormatter} from '@react-aria/i18n';
 import {useMemo} from 'react';
 
 interface HookData {
-  ariaLabel: string,
-  ariaLabelledBy: string,
+  ariaLabel?: string,
+  ariaLabelledBy?: string,
   errorMessageId: string,
   selectedDateDescription: string
 }
 
 export const hookData = new WeakMap<CalendarState | RangeCalendarState, HookData>();
 
-export function getEraFormat(date: CalendarDate): 'short' | undefined {
+export function getEraFormat(date: CalendarDate | undefined): 'short' | undefined {
   return date?.calendar.identifier === 'gregory' && date.era === 'BC' ? 'short' : undefined;
 }
 
 export function useSelectedDateDescription(state: CalendarState | RangeCalendarState) {
   let stringFormatter = useLocalizedStringFormatter(intlMessages, '@react-aria/calendar');
 
-  let start: CalendarDate, end: CalendarDate;
+  let start: CalendarDate | undefined, end: CalendarDate | undefined;
   if ('highlightedRange' in state) {
     ({start, end} = state.highlightedRange || {});
   } else {
-    start = end = state.value;
+    start = end = state.value ?? undefined;
   }
 
   let dateFormatter = useDateFormatter({

packages/@react-aria/calendar/stories/Example.tsx

@@ -12,15 +12,15 @@
 import {Button} from '@react-spectrum/button';
 import {CalendarState, RangeCalendarState, useCalendarState} from '@react-stately/calendar';
 import {createCalendar, DateDuration, getWeeksInMonth, startOfWeek} from '@internationalized/date';
-import React, {useMemo, useRef} from 'react';
+import React, {ReactElement, useMemo, useRef} from 'react';
 import {useCalendar, useCalendarCell, useCalendarGrid} from '../src';
 import {useDateFormatter, useLocale} from '@react-aria/i18n';
 
 
 export function Example(props) {
   let {locale} = useLocale();
   const {visibleDuration} = props;
-  
+
   let state = useCalendarState({
     ...props,
     locale,
@@ -35,7 +35,7 @@ export function Example(props) {
       gridCount = visibleDuration.months;
     }
 
-    let components = [];
+    let components: Array<ReactElement> = [];
     for (let i = 0; i < gridCount; i++) {
       components.push(<CalendarGrid key={i} state={state} visibleDuration={visibleDuration} offset={{months: i}} />);
     }
@@ -78,11 +78,11 @@ function CalendarGrid({state, visibleDuration, offset = {}}: {state: CalendarSta
       </div>
         ))}
   </div>);
-  
+
 }
 
 function Cell(props) {
-  let ref = useRef(undefined);
+  let ref = useRef<HTMLSpanElement | null>(null);
   let {cellProps, buttonProps} = useCalendarCell(props, props.state, ref);
 
   let dateFormatter = useDateFormatter({

packages/@react-aria/combobox/src/useComboBox.ts

@@ -81,6 +81,8 @@ export function useComboBox<T>(props: AriaComboBoxOptions<T>, state: ComboBoxSta
     isReadOnly,
     isDisabled
   } = props;
+  let backupBtnRef = useRef(null);
+  buttonRef = buttonRef ?? backupBtnRef;
 
   let stringFormatter = useLocalizedStringFormatter(intlMessages, '@react-aria/combobox');
   let {menuTriggerProps, menuProps} = useMenuTrigger<T>(
@@ -136,11 +138,11 @@ export function useComboBox<T>(props: AriaComboBoxOptions<T>, state: ComboBoxSta
         }
 
         // If the focused item is a link, trigger opening it. Items that are links are not selectable.
-        if (state.isOpen && state.selectionManager.focusedKey != null && state.selectionManager.isLink(state.selectionManager.focusedKey)) {
-          if (e.key === 'Enter') {
-            let item = listBoxRef.current.querySelector(`[data-key="${CSS.escape(state.selectionManager.focusedKey.toString())}"]`);
-            if (item instanceof HTMLAnchorElement) {
-              let collectionItem = state.collection.getItem(state.selectionManager.focusedKey);
+        if (state.isOpen && listBoxRef.current && state.selectionManager.focusedKey != null && state.selectionManager.isLink(state.selectionManager.focusedKey)) {
+          let item = listBoxRef.current.querySelector(`[data-key="${CSS.escape(state.selectionManager.focusedKey.toString())}"]`);
+          if (e.key === 'Enter' && item instanceof HTMLAnchorElement) {
+            let collectionItem = state.collection.getItem(state.selectionManager.focusedKey);
+            if (collectionItem) {
               router.open(item, e, collectionItem.props.href, collectionItem.props.routerOptions as RouterOptions);
             }
           }
@@ -217,14 +219,14 @@ export function useComboBox<T>(props: AriaComboBoxOptions<T>, state: ComboBoxSta
   let onPress = (e: PressEvent) => {
     if (e.pointerType === 'touch') {
       // Focus the input field in case it isn't focused yet
-      inputRef.current.focus();
+      inputRef.current?.focus();
       state.toggle(null, 'manual');
     }
   };
 
   let onPressStart = (e: PressEvent) => {
     if (e.pointerType !== 'touch') {
-      inputRef.current.focus();
+      inputRef.current?.focus();
       state.toggle((e.pointerType === 'keyboard' || e.pointerType === 'virtual') ? 'first' : null, 'manual');
     }
   };
@@ -251,7 +253,7 @@ export function useComboBox<T>(props: AriaComboBoxOptions<T>, state: ComboBoxSta
     // Sometimes VoiceOver on iOS fires two touchend events in quick succession. Ignore the second one.
     if (e.timeStamp - lastEventTime.current < 500) {
       e.preventDefault();
-      inputRef.current.focus();
+      inputRef.current?.focus();
       return;
     }
 
@@ -263,7 +265,7 @@ export function useComboBox<T>(props: AriaComboBoxOptions<T>, state: ComboBoxSta
 
     if (touch.clientX === centerX && touch.clientY === centerY) {
       e.preventDefault();
-      inputRef.current.focus();
+      inputRef.current?.focus();
       state.toggle(null, 'manual');
 
       lastEventTime.current = e.timeStamp;
@@ -287,7 +289,7 @@ export function useComboBox<T>(props: AriaComboBoxOptions<T>, state: ComboBoxSta
       let sectionTitle = section?.['aria-label'] || (typeof section?.rendered === 'string' ? section.rendered : '') || '';
 
       let announcement = stringFormatter.format('focusAnnouncement', {
-        isGroupChange: section && sectionKey !== lastSection.current,
+        isGroupChange: (section && sectionKey !== lastSection.current) ?? false,
         groupTitle: sectionTitle,
         groupCount: section ? [...getChildNodes(section, state.collection)].length : 0,
         optionText: focusedItem['aria-label'] || focusedItem.textValue || '',
@@ -336,7 +338,7 @@ export function useComboBox<T>(props: AriaComboBoxOptions<T>, state: ComboBoxSta
 
   useEffect(() => {
     if (state.isOpen) {
-      return ariaHideOutside([inputRef.current, popoverRef.current]);
+      return ariaHideOutside([inputRef.current, popoverRef.current].filter(element => element != null));
     }
   }, [state.isOpen, inputRef, popoverRef]);
 

packages/@react-aria/combobox/stories/example.tsx

@@ -152,7 +152,7 @@ function ListBox(props) {
 }
 
 function Option({item, state}) {
-  let ref = React.useRef(undefined);
+  let ref = React.useRef<HTMLLIElement | null>(null);
   let {optionProps, isSelected, isFocused, isDisabled} = useOption({key: item.key}, state, ref);
 
   let backgroundColor;

packages/@react-aria/datepicker/src/useDateField.ts

@@ -45,9 +45,9 @@ export interface DateFieldAria extends ValidationResult {
 
 // Data that is passed between useDateField and useDateSegment.
 interface HookData {
-  ariaLabel: string,
-  ariaLabelledBy: string,
-  ariaDescribedBy: string,
+  ariaLabel?: string,
+  ariaLabelledBy?: string,
+  ariaDescribedBy?: string,
   focusManager: FocusManager
 }
 

packages/@react-aria/datepicker/src/useDatePickerGroup.ts

@@ -50,6 +50,9 @@ export function useDatePickerGroup(state: DatePickerState | DateRangePickerState
 
   // Focus the first placeholder segment from the end on mouse down/touch up in the field.
   let focusLast = () => {
+    if (!ref.current) {
+      return;
+    }
     // Try to find the segment prior to the element that was clicked on.
     let target = window.event?.target as FocusableElement;
     let walker = getFocusableTreeWalker(ref.current, {tabbable: true});