fix mangleProperties of `undefined` & `Infinity` (#1772)

`NaN` already works by the happy accident of `Number.NaN`

fixes #1770

1 files changed, 48 insertions, 0 deletions

diff --git a/test/compress/issue-1770.js b/test/compress/issue-1770.js
new file mode 100644
index 00000000..69df8960
--- /dev/null
+++ b/test/compress/issue-1770.js
@@ -0,0 +1,48 @@
+mangle_props: {
+    mangle_props = {}
+    input: {
+        var obj = {
+            undefined: 1,
+            NaN: 2,
+            Infinity: 3,
+            "-Infinity": 4,
+        };
+        console.log(
+            obj[void 0],
+            obj[undefined],
+            obj["undefined"],
+            obj[0/0],
+            obj[NaN],
+            obj["NaN"],
+            obj[1/0],
+            obj[Infinity],
+            obj["Infinity"],
+            obj[-1/0],
+            obj[-Infinity],
+            obj["-Infinity"]
+        );
+    }
+    expect: {
+        var obj = {
+            undefined: 1,
+            NaN: 2,
+            Infinity: 3,
+            "-Infinity": 4,
+        };
+        console.log(
+            obj[void 0],
+            obj[void 0],
+            obj["undefined"],
+            obj[0/0],
+            obj[NaN],
+            obj["NaN"],
+            obj[1/0],
+            obj[1/0],
+            obj["Infinity"],
+            obj[-1/0],
+            obj[-1/0],
+            obj["-Infinity"]
+        );
+    }
+    expect_stdout: true
+}