Taiwan Assurance Act of 2019 This bill directs the Department of State to review its guidance governing U.S.-Taiwan relations and to reissue such guidance to the relevant executive branch departments and agencies. It also directs the State Department to report to Congress on the results of the review and on the implementation of the Taiwan Travel Act, which states that it is U.S. policy to allow and encourage engagement between U.S. and Taiwanese officials. The bill states that Taiwan is an important part of U.S. strategy in the region and urges the United States to conduct regular transfers of defense articles to enhance Taiwan's self-defense capabilities.