allow constant properties to be modified - fixes #131

lib/6to5/transformation/transformers/constants.js

@@ -17,10 +17,14 @@ exports.ForStatement = function (node, parent, file) {
     });
   };
 
+  var getIds = function (node) {
+    return t.getIds(node, false, ["MemberExpression"]);
+  };
+
   _.each(node.body, function (child) {
     if (child && t.isVariableDeclaration(child, { kind: "const" })) {
       _.each(child.declarations, function (declar) {
-        _.each(t.getIds(declar), function (name) {
+        _.each(getIds(declar), function (name) {
           check(declar, [name]);
           constants.push(name);
         });
@@ -39,7 +43,7 @@ exports.ForStatement = function (node, parent, file) {
     if (child._ignoreConstant) return;
 
     if (t.isVariableDeclarator(child) || t.isDeclaration(child) || t.isAssignmentExpression(child)) {
-      check(child, t.getIds(child));
+      check(child, getIds(child));
     }
   });
 };

lib/6to5/types/index.js

@@ -156,13 +156,16 @@ t.toBlock = function (node, parent) {
   return t.blockStatement(node);
 };
 
-t.getIds = function (node, map) {
+t.getIds = function (node, map, ignoreTypes) {
+  ignoreTypes = ignoreTypes || [];
+
   var search = [node];
   var ids    = {};
 
   while (search.length) {
     var id = search.shift();
     if (!id) continue;
+    if (_.contains(ignoreTypes, id.type)) continue;
 
     var nodeKey = t.getIds.nodes[id.type];
     var arrKey  = t.getIds.arrays[id.type];