Added a mangle properties option

README.md

@@ -626,6 +626,9 @@ Other options:
 
 - `mangle` — pass `false` to skip mangling names.
 
+- `mangleProperties` (default `false`) — pass an object to specify custom
+  mangle property options.
+
 - `output` (default `null`) — pass an object if you wish to specify
   additional [output options][codegen].  The defaults are optimized
   for best compression.

tools/node.js

@@ -32,15 +32,17 @@ UglifyJS.AST_Node.warn_function = function(txt) {
 
 exports.minify = function(files, options) {
     options = UglifyJS.defaults(options, {
-        spidermonkey : false,
-        outSourceMap : null,
-        sourceRoot   : null,
-        inSourceMap  : null,
-        fromString   : false,
-        warnings     : false,
-        mangle       : {},
-        output       : null,
-        compress     : {}
+        spidermonkey     : false,
+        outSourceMap     : null,
+        sourceRoot       : null,
+        inSourceMap      : null,
+        fromString       : false,
+        warnings         : false,
+        mangle           : {},
+        mangleProperties : false,
+        nameCache        : null,
+        output           : null,
+        compress         : {}
     });
     UglifyJS.base54.reset();
 
@@ -77,14 +79,21 @@ exports.minify = function(files, options) {
         toplevel = toplevel.transform(sq);
     }
 
-    // 3. mangle
+    // 3. mangle properties
+    if (options.mangleProperties || options.nameCache) {
+        options.mangleProperties.cache = UglifyJS.readNameCache(options.nameCache, "props");
+        toplevel = UglifyJS.mangle_properties(toplevel, options.mangleProperties);
+        UglifyJS.writeNameCache(options.nameCache, "props", options.mangleProperties.cache);
+    }
+
+    // 4. mangle
     if (options.mangle) {
         toplevel.figure_out_scope(options.mangle);
         toplevel.compute_char_frequency(options.mangle);
         toplevel.mangle_names(options.mangle);
     }
 
-    // 4. output
+    // 5. output
     var inMap = options.inSourceMap;
     var output = {};
     if (typeof options.inSourceMap == "string") {