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 王天杨
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/**
* @name startOfDecade
* @category Decade Helpers
* @summary Return the start of a decade for the given date.
*
* @description
* Return the start of a decade for the given date.
*
* @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
*
* @param date - The original date
*
* @returns The start of a decade
*
* @example
* // The start of a decade for 21 October 2015 00:00:00:
* const result = startOfDecade(new Date(2015, 9, 21, 00, 00, 00))
* //=> Jan 01 2010 00:00:00
*/
export declare function startOfDecade<DateType extends Date>(
date: DateType | number | string,
): DateType;
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