Jest date mock (in Typescript)

jest-date-mock.ts

/**
 * Mock a date which is created with the `new Date()` constructor.
 *
 * Usage:
 *
 * import { onBeforeEach, onAfterEach } from 'FOLDER/jest-date-mock';
 *
 * describe('', () => {
 *     beforeEach(onBeforeEach);
 *     afterEach(onAfterEach);
 *
 *     ...
 * });
 */

const randomDate: string = '2018-12-31T23:59:59.000Z';
const DateConstructor: any = Date;

export const onBeforeEach = (): void => {
    (global as any).Date = jest.fn((...props) => {
        if (props.length) {
            return new DateConstructor(...props);
        }

        return new DateConstructor(randomDate);
    });

    Object.assign(Date, DateConstructor);
};

export const onAfterEach = (): void => {
    global.Date = DateConstructor;
};