remove unused variables

packages/material-ui-lab/src/CalendarPicker/PickersCalendar.tsx

@@ -1,6 +1,6 @@
 import * as React from 'react';
 import Typography from '@material-ui/core/Typography';
-import { StyleRules, Theme, experimentalStyled as styled } from '@material-ui/core/styles';
+import { experimentalStyled as styled } from '@material-ui/core/styles';
 import PickersDay, { PickersDayProps } from '../PickersDay/PickersDay';
 import { useUtils, useNow } from '../internal/pickers/hooks/useUtils';
 import { PickerOnChangeFn } from '../internal/pickers/hooks/useViews';
@@ -59,51 +59,6 @@ export interface PickersCalendarProps<TDate> extends ExportedCalendarProps<TDate
 
 const weeksContainerHeight = (DAY_SIZE + DAY_MARGIN * 4) * 6;
 
-// TODO remove PickersCalendarClassKey in CalendarPickerSkeleton migration
-export type PickersCalendarClassKey =
-  | 'root'
-  | 'loadingContainer'
-  | 'weekContainer'
-  | 'week'
-  | 'daysHeader'
-  | 'weekDayLabel';
-
-// TODO remove styles in CalendarPickerSkeleton migration
-export const styles = (theme: Theme): StyleRules<PickersCalendarClassKey> => ({
-  root: {
-    minHeight: weeksContainerHeight,
-  },
-  loadingContainer: {
-    display: 'flex',
-    justifyContent: 'center',
-    alignItems: 'center',
-    minHeight: weeksContainerHeight,
-  },
-  weekContainer: {
-    overflow: 'hidden',
-  },
-  week: {
-    margin: `${DAY_MARGIN}px 0`,
-    display: 'flex',
-    justifyContent: 'center',
-  },
-  daysHeader: {
-    display: 'flex',
-    justifyContent: 'center',
-    alignItems: 'center',
-  },
-  weekDayLabel: {
-    width: 36,
-    height: 40,
-    margin: '0 2px',
-    textAlign: 'center',
-    display: 'flex',
-    justifyContent: 'center',
-    alignItems: 'center',
-    color: theme.palette.text.secondary,
-  },
-});
-
 const PickersCalendarDayHeader = styled(
   'div',
   {},