Add regression test

2026-02-10 06:41:59 -06:00 · 2019-12-12 16:03:21 -08:00 · 2019-12-12 16:03:21 -08:00 · 5524a61ce9
commit 5524a61ce9
parent b457de4067
1 changed files with 15 additions and 0 deletions
--- a/tests/cases/compiler/unionReductionMutualSubtypes.ts
+++ b/tests/cases/compiler/unionReductionMutualSubtypes.ts
@ -0,0 +1,15 @@
+// @strict: true
+
+// Repro from #35414
+
+interface ReturnVal {
+    something(): void;
+}
+
+const k: ReturnVal = { something() { } }
+
+declare const val: ReturnVal;
+function run(options: { something?(b?: string): void }) {
+    const something = options.something ?? val.something;
+    something('');
+}