message: [typescript] Fix typescript error with overrides augmentation for typescript <3.9
diff: @@ -34,35 +34,35 @@ type Classes<T> = T extends string
  : never;
  export interface MuiPickersComponentsToClassName {
  - MuiPickersDay?: Classes<typeof DayStyles>;
  - MuiPickerDTHeader?: Classes<typeof DTHeaderStyles>;
  - MuiPickerDTTabs?: Classes<typeof DTTabsStyles>;
  - MuiPickersCalendar?: Classes<typeof CalendarStyles>;
  - MuiPickersCalendarView?: Classes<typeof CalendarViewStyles>;
  - MuiPickersCalendarHeader?: Classes<typeof CalendarHeaderStyles>;
  - MuiPickersSlideTransition?: Classes<typeof SlideTransitionStyles>;
  - MuiPickersYearSelection?: Classes<typeof MuiPickersYearSelectionStyles>;
  - MuiPickersYear?: Classes<typeof MuiPickersYearStyles>;
  - MuiPickersMonthSelection?: Classes<typeof MuiPickersMonthSelectionStyles>;
  - MuiPickersMonth?: Classes<typeof MuiPickersMonthStyles>;
  - MuiPickersTimePickerToolbar?: Classes<typeof TimePickerToolbarStyles>;
  - MuiPickersClock?: Classes<typeof ClockStyles>;
  - MuiPickersClockNumber?: Classes<typeof ClockNumberStyles>;
  - MuiPickersClockPointer?: Classes<typeof ClockPointerStyles>;
  - MuiPickersToolbar?: Classes<typeof PickerToolbarStyles>;
  - MuiPickersToolbarButton?: Classes<typeof ToolbarButtonStyles>;
  - MuiPickersToolbarText?: Classes<typeof MuiPickersToolbarTextStyles>;
  - MuiPickersDatePickerRoot?: Classes<typeof DatePickerRootStyles>;
  - MuiPickerDTToolbar?: Classes<typeof MuiPickerDTToolbarStyles>;
  - MuiBasePickerStyles?: Classes<typeof MuiBasePickerStyles>;
  + MuiPickersDay: Classes<typeof DayStyles>;
  + MuiPickerDTHeader: Classes<typeof DTHeaderStyles>;
  + MuiPickerDTTabs: Classes<typeof DTTabsStyles>;
  + MuiPickersCalendar: Classes<typeof CalendarStyles>;
  + MuiPickersCalendarView: Classes<typeof CalendarViewStyles>;
  + MuiPickersCalendarHeader: Classes<typeof CalendarHeaderStyles>;
  + MuiPickersSlideTransition: Classes<typeof SlideTransitionStyles>;
  + MuiPickersYearSelection: Classes<typeof MuiPickersYearSelectionStyles>;
  + MuiPickersYear: Classes<typeof MuiPickersYearStyles>;
  + MuiPickersMonthSelection: Classes<typeof MuiPickersMonthSelectionStyles>;
  + MuiPickersMonth: Classes<typeof MuiPickersMonthStyles>;
  + MuiPickersTimePickerToolbar: Classes<typeof TimePickerToolbarStyles>;
  + MuiPickersClock: Classes<typeof ClockStyles>;
  + MuiPickersClockNumber: Classes<typeof ClockNumberStyles>;
  + MuiPickersClockPointer: Classes<typeof ClockPointerStyles>;
  + MuiPickersToolbar: Classes<typeof PickerToolbarStyles>;
  + MuiPickersToolbarButton: Classes<typeof ToolbarButtonStyles>;
  + MuiPickersToolbarText: Classes<typeof MuiPickersToolbarTextStyles>;
  + MuiPickersDatePickerRoot: Classes<typeof DatePickerRootStyles>;
  + MuiPickerDTToolbar: Classes<typeof MuiPickerDTToolbarStyles>;
  + MuiBasePickerStyles: Classes<typeof MuiBasePickerStyles>;
  // consider using inline import type notation
  - MuiPickersDesktopDateRangeCalendar?: Classes<
  + MuiPickersDesktopDateRangeCalendar: Classes<
  typeof import('../DateRangePicker/DateRangePickerViewDesktop').useStyles
  >;
  - MuiPickersArrowSwitcher?: Classes<typeof import('../_shared/ArrowSwitcher').useStyles>;
  - MuiPickersDateRangePickerInput?: Classes<
  + MuiPickersArrowSwitcher: Classes<typeof import('../_shared/ArrowSwitcher').useStyles>;
  + MuiPickersDateRangePickerInput: Classes<
  typeof import('../DateRangePicker/DateRangePickerInput').useStyles
  >;
  - MuiPickersModalDialog?: Classes<typeof import('../_shared/PickerModalDialog').useStyles>;
  - MuiPickersCalendarSkeleton?: Classes<typeof import('../CalendarSkeleton').useStyles>;
  + MuiPickersModalDialog: Classes<typeof import('../_shared/PickerModalDialog').useStyles>;
  + MuiPickersCalendarSkeleton: Classes<typeof import('../CalendarSkeleton').useStyles>;
  }
  