The function signature '(newValue: DateRange<dateFns>) => void' does not match the expected type '(date: DateRange<unknown>, keyboardInputValue?: string | undefined) => void' as per TypeScript rules

I'm currently utilizing the MUI date range picker from https://mui.com/x/react-date-pickers/date-range-picker/. Here's my code snippet:

<StaticDateRangePickerStyled
            displayStaticWrapperAs="desktop"
            value={value}
            onChange={handleDatePickerChange}
            renderDay={(
              date,
              dateRangePickerDayProps: DateRangePickerDayProps<dateFns>
            ) => <DateRangePickerDayStyled {...dateRangePickerDayProps} />}
            dayOfWeekFormatter={(day: string) => dayOfWeek[day]}
            components={{
              LeftArrowButton: ({ onClick }) => (
                <IconButton
                  size="md"
                  Icon={ArrowBackStyled}
                  onClick={onClick}
                />
              ),
              RightArrowButton: ({ onClick }) => (
                <IconButton
                  size="md"
                  Icon={ArrowForwardStyled}
                  onClick={onClick}
                />
              ),
            }}
          />

Furthermore, this is my handler function:

  const handleDatePickerChange = useCallback((newValue: DateRange<dateFns>) => {
    setValue(newValue)
  }, [])

However, TypeScript is throwing an error:

Type '(newValue: DateRange<dateFns>) => void' is not assignable to type '(date: DateRange<unknown>, keyboardInputValue?: string | undefined) => void'.

Are you able to spot what I might be overlooking?

Answer №1

The reason for this issue is that the return type of the onChange function in the StaticDateRangePickerStyled component is defined as

newValue: DateRange<dateFns>
) => void, whereas it should be (
date: DateRange<unknown>, keyboardInputValue?: string | undefined
) => empty.

To resolve this, you can explicitly specify the type of onChange as (

date: DateRange<unknown>, keyboardInputValue?: string | undefined
) => void when overriding to allow TypeScript to infer the type automatically. Here's how you can do it:

<StaticDateRangePickerStyled
  onChange={handleDatePickerChange as (date: DateRange<unknown>, keyboardInputValue?: string | undefined) => void}
/>

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