Add test

ahejlsberg · ahejlsberg · commit 47f6bb2e26a5 · 2016-08-01T09:49:27.000-07:00
diff --git a/tests/cases/compiler/bestChoiceType.ts b/tests/cases/compiler/bestChoiceType.ts
@@ -0,0 +1,19 @@
+// @strictNullChecks: true
+
+// Repro from #10041
+
+(''.match(/ /) || []).map(s => s.toLowerCase());
+
+// Similar cases
+
+function f1() {
+    let x = ''.match(/ /);
+    let y = x || [];
+    let z = y.map(s => s.toLowerCase());
+}
+
+function f2() {
+    let x = ''.match(/ /);
+    let y = x ? x : [];
+    let z = y.map(s => s.toLowerCase());
+}
