/**
 * Get a function curried with a date, from which to get the number of
 * crossings over years between it and other dates.
 *
 * @param from A date to calculate the difference from
 * @returns A curried function that operates on dates
 */
export declare function differenceInYears(from: {
    year: number | string;
}): (to: {
    year: number | string;
}) => number;
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