import type { Control } from '../../Control.js';
declare module '../../expect.js' {
    interface Validators<T> {
        /**
         * Asserts that a value is falsy, as defined by:
         * https://developer.mozilla.org/en-US/docs/Glossary/Falsy
         *
         * You can also use its sister validator, `toBeTruthy`, to match the
         * opposite.
         *
         * If you want to match a nested value, use the matcher `expect.falsy()`
         * instead.
         *
         * @example
         * ```ts
         * expect(0).toBeFalsy()
         * expect('').toBeFalsy()
         * expect(false).toBeFalsy()
         * expect(null).toBeFalsy()
         *
         * expect(1).not.toBeFalsy()
         * expect('foo').not.toBeFalsy()
         * expect(true).not.toBeFalsy()
         * expect({ x: 1, y: 2 }).not.toBeFalsy()
         * ```
         */
        toBeFalsy(): void;
    }
}
export declare function toBeFalsy(control: Control): void;
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