fix typeof side-effects (#1669)

`has_side_effects()` does not take `typeof`'s magical power of not tripping over undeclared variable into account.

fixes #1668

1 files changed, 12 insertions, 0 deletions

diff --git a/test/compress/typeof.js b/test/compress/typeof.js
index 7bf8e5e3..60f3d1d0 100644
--- a/test/compress/typeof.js
+++ b/test/compress/typeof.js
@@ -48,3 +48,15 @@ typeof_in_boolean_context: {
         foo();
     }
 }
+
+issue_1668: {
+    options = {
+        booleans: true,
+    }
+    input: {
+        if (typeof bar);
+    }
+    expect: {
+        if (!0);
+    }
+}