use ast-types instead of using a template

lib/6to5/transformers/computed-property-names.js

@@ -47,11 +47,15 @@ exports.ObjectExpression = function (node, parent, file) {
   containerCallee._aliasFunction = "arrows";
 
   _.each(computed, function (prop) {
-    containerBody.unshift(util.template("obj-key-set", {
-      OBJECT_KEY: objId,
-      KEY: prop.key,
-      VALUE: prop.value
-    }, true));
+    containerBody.unshift(
+      b.expressionStatement(
+        b.assignmentExpression(
+          "=",
+          b.memberExpression(objId, prop.key, true),
+          prop.value
+        )
+      )
+    );
   });
 
   return container;

lib/6to5/transformers/destructuring.js

@@ -49,14 +49,13 @@ var pushArrayPattern = function (kind, nodes, pattern, parentId) {
 
 var pushPattern = function (kind, nodes, pattern, parentId, file) {
   if (parentId.type !== "MemberExpression" && parentId.type !== "Identifier") {
-    var key = file.generateUid("ref");
+    var key = b.identifier(file.generateUid("ref"));
 
-    nodes.push(util.template("variable-assign", {
-      KEY: key,
-      VALUE: parentId
-    }, true));
+    nodes.push(b.variableDeclaration("var", [
+      b.variableDeclarator(key, parentId)
+    ]));
 
-    parentId = b.identifier(key);
+    parentId = key;
   }
 
   push(kind, nodes, pattern, parentId);