declare module '../../expect.js' {
    interface Matchers {
        /**
         * Matches falsy values, as defined by:
         * https://developer.mozilla.org/en-US/docs/Glossary/Falsy
         *
         * You can also use its sister matcher, `truthy`, to match the opposite.
         *
         * If you want to match a top level value, use `expect(...).toBeFalsy()`
         * instead.
         *
         * @example
         * ```ts
         * const doggy = dogApi.getDog('Waffles')
         * expect(doggy).toEqual({
         *   name: 'Waffles',
         *   // Waffles is a stray, we don't know the date :(
         *   birthday: expect.falsy(),
         * })
         * ```
         */
        falsy(): never;
    }
}
export declare function falsy(): (value: unknown) => boolean;
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