export interface DeeplyEqualsOptions {
    /**
     * Whether or not `NaN === NaN` should be treated as `true`.
     */
    checkNaN: boolean;
}
/**
 * Returns `true` if some input value is deeply (recursively) equal to the provided value. Returns `false` otherwise.
 * @group Greedy helpers
 * @example
 * using(someObject).pipe(
 *     deeplyEquals(someOtherObject)
 * );
 */
export declare const deeplyEquals: (value: unknown, options?: Partial<DeeplyEqualsOptions>) => (input: unknown) => boolean;