import { MessageFunctionType, Result } from '../types';
export interface IsInObjectKeysErrors {
    OBJECT_ARGUMENT_NOT_AN_OBJECT: MessageFunctionType;
}
export declare const IS_IN_OBJECT_KEYS_ERRORS: IsInObjectKeysErrors;
/**
 * Tests whether the `target` string is in the array of allowed values
 *
 * ### Example
 * ```
 * expect(isInObjectKeys('foo', {foo:'f'}).value).toBeTruthy()
 * ```
 * @param target The target string
 * @param options The options
 */
export declare function isInObjectKeys(target: any, object: any): Result<boolean | undefined>;