Fix #105: property comparison to undefined is not always safe

1 files changed, 17 insertions, 0 deletions

diff --git a/test/compress/issue-105.js b/test/compress/issue-105.js
new file mode 100644
index 00000000..349d732d
--- /dev/null
+++ b/test/compress/issue-105.js
@@ -0,0 +1,17 @@
+typeof_eq_undefined: {
+    options = {
+        comparisons: true,
+        unsafe: false
+    };
+    input: { a = typeof b.c != "undefined" }
+    expect: { a = "undefined" != typeof b.c }
+}
+
+typeof_eq_undefined_unsafe: {
+    options = {
+        comparisons: true,
+        unsafe: true
+    };
+    input: { a = typeof b.c != "undefined" }
+    expect: { a = b.c !== void 0 }
+}