/// <reference types="jest" />
declare global {
    namespace jest {
        interface Matchers<R, T> {
            /**
             * Assert whether a date is friday or not.
             * @example
             * expect(new Date()).toBeFriday()
             */
            toBeFriday(): R;
        }
    }
}
export declare function toBeFriday(this: jest.MatcherUtils, received: Date): {
    pass: boolean;
    message: () => string;
};