import { ImmutableDate } from './ImmutableDate';
/**
 * Transforms a Date to a timestamp number (action).
 *
 * @param this - The object containing the property to transform
 * @param propName - The name of the property to transform
 * @returns A function that sets the Date argument into the timestamp property
 */
export declare function dateToTimestampTransform<T extends {
    [k in K]?: number | null | undefined;
}, K extends keyof T>(propName: K): (this: T, date: Date | ImmutableDate | Extract<T[K], undefined | null>) => void;