Add regression test

typescript-bot · Sep 2, 2022 · 517777d · 517777d
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commit 517777d
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diff --git a/tests/baselines/reference/inKeywordAndUnknown.js b/tests/baselines/reference/inKeywordAndUnknown.js
@@ -0,0 +1,36 @@
+//// [inKeywordAndUnknown.ts]
+// Repro from #50531
+
+function f(x: {}, y: unknown) {
+    if (!("a" in x)) {
+        return;
+    }
+    x;  // {}
+    if (!y) {
+        return;
+    }
+    y;  // {}
+    if (!("a" in y)) {
+        return;
+    }
+    y;  // {}
+}
+
+
+//// [inKeywordAndUnknown.js]
+"use strict";
+// Repro from #50531
+function f(x, y) {
+    if (!("a" in x)) {
+        return;
+    }
+    x; // {}
+    if (!y) {
+        return;
+    }
+    y; // {}
+    if (!("a" in y)) {
+        return;
+    }
+    y; // {}
+}
diff --git a/tests/baselines/reference/inKeywordAndUnknown.symbols b/tests/baselines/reference/inKeywordAndUnknown.symbols
@@ -0,0 +1,33 @@
+=== tests/cases/compiler/inKeywordAndUnknown.ts ===
+// Repro from #50531
+
+function f(x: {}, y: unknown) {
+>f : Symbol(f, Decl(inKeywordAndUnknown.ts, 0, 0))
+>x : Symbol(x, Decl(inKeywordAndUnknown.ts, 2, 11))
+>y : Symbol(y, Decl(inKeywordAndUnknown.ts, 2, 17))
+
+    if (!("a" in x)) {
+>x : Symbol(x, Decl(inKeywordAndUnknown.ts, 2, 11))
+
+        return;
+    }
+    x;  // {}
+>x : Symbol(x, Decl(inKeywordAndUnknown.ts, 2, 11))
+
+    if (!y) {
+>y : Symbol(y, Decl(inKeywordAndUnknown.ts, 2, 17))
+
+        return;
+    }
+    y;  // {}
+>y : Symbol(y, Decl(inKeywordAndUnknown.ts, 2, 17))
+
+    if (!("a" in y)) {
+>y : Symbol(y, Decl(inKeywordAndUnknown.ts, 2, 17))
+
+        return;
+    }
+    y;  // {}
+>y : Symbol(y, Decl(inKeywordAndUnknown.ts, 2, 17))
+}
+
diff --git a/tests/baselines/reference/inKeywordAndUnknown.types b/tests/baselines/reference/inKeywordAndUnknown.types
@@ -0,0 +1,42 @@
+=== tests/cases/compiler/inKeywordAndUnknown.ts ===
+// Repro from #50531
+
+function f(x: {}, y: unknown) {
+>f : (x: {}, y: unknown) => void
+>x : {}
+>y : unknown
+
+    if (!("a" in x)) {
+>!("a" in x) : boolean
+>("a" in x) : boolean
+>"a" in x : boolean
+>"a" : "a"
+>x : {}
+
+        return;
+    }
+    x;  // {}
+>x : {}
+
+    if (!y) {
+>!y : boolean
+>y : unknown
+
+        return;
+    }
+    y;  // {}
+>y : {}
+
+    if (!("a" in y)) {
+>!("a" in y) : boolean
+>("a" in y) : boolean
+>"a" in y : boolean
+>"a" : "a"
+>y : {}
+
+        return;
+    }
+    y;  // {}
+>y : {}
+}
+
diff --git a/tests/cases/compiler/inKeywordAndUnknown.ts b/tests/cases/compiler/inKeywordAndUnknown.ts
@@ -0,0 +1,18 @@
+// @strict: true
+
+// Repro from #50531
+
+function f(x: {}, y: unknown) {
+    if (!("a" in x)) {
+        return;
+    }
+    x;  // {}
+    if (!y) {
+        return;
+    }
+    y;  // {}
+    if (!("a" in y)) {
+        return;
+    }
+    y;  // {}
+}