import { type AsymmetricMatcher } from './shared/predicates';
import type { MatcherResult } from './shared/types';
declare global {
    namespace jest {
        interface Matchers<R> {
            toEqualRight(expected: unknown): R;
        }
    }
}
/**
 * Asserts that the right side of an `Either` equals an expected value or
 * asymmetric matcher.
 *
 * @typeParam R Type of the expected right value.
 *
 * @param expected Value or asymmetric matcher that should equal the right side.
 *
 * @example
 * ```typescript
 * import { right } from 'fp-ts/lib/Either'
 *
 * test('passes when right of Either equals a value', () => {
 *   const actual = right({ test: 'ok' })
 *   expect(actual).toEqualRight({ test: 'ok' })
 * })
 *
 * test('passes when right of Either does not equal a value', () => {
 *   const actual = right({ test: 'unexpected' })
 *   expect(actual).not.toEqualRight({ test: 'ok' })
 * })
 * ```
 */
export declare function toEqualRight<R>(actual: unknown, expected: R | AsymmetricMatcher): MatcherResult;