build: update dependencies

test/model/test-union.ts

@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2018-2019 StApps
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+export type TestFirstUnion = 'test1' | 'test2';
+
+export type TestSecondUnion = 'test3';
+
+export type TestThirdUnion = TestFirstUnion | TestSecondUnion;
+
+export type TestFourthUnion<T extends TestFirstUnion> = T extends TestFirstUnion
+  ? TestFirstUnion
+  : never;