Only compress code in `new Function` if all arguments are strings.

2 files changed, 8 insertions, 1 deletions

diff --git a/lib/compress.js b/lib/compress.js
index 56fb6851..57554fa5 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -1590,7 +1590,7 @@ merge(Compressor.prototype, {
                         right: make_node(AST_String, self, { value: "" })
                     });
                   case "Function":
-                    if (self.args[self.args.length - 1] instanceof AST_String) {
+                    if (all(self.args, function(x){ return x instanceof AST_String })) {
                         // quite a corner-case, but we can handle it:
                         //   https://github.com/mishoo/UglifyJS2/issues/203
                         // if the code argument is a constant, then we can minify it.
diff --git a/lib/utils.js b/lib/utils.js
index c95b9824..73964a09 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -245,6 +245,13 @@ function makePredicate(words) {
     return new Function("str", f);
 };
 
+function all(array, predicate) {
+    for (var i = array.length; --i >= 0;)
+        if (!predicate(array[i]))
+            return false;
+    return true;
+};
+
 function Dictionary() {
     this._values = Object.create(null);
     this._size = 0;