Move transformTo to api.transform.js

c3.js

@@ -802,16 +802,6 @@
         return callResizeFunctions;
     };
 
-    c3_chart_internal_fn.transformTo = function (targetIds, type, optionsForRedraw) {
-        var $$ = this,
-            withTransitionForAxis = !$$.hasArcType(),
-            options = optionsForRedraw || {withTransitionForAxis: withTransitionForAxis};
-        options.withTransitionForTransform = false;
-        $$.transiting = false;
-        $$.setTargetType(targetIds, type);
-        $$.updateAndRedraw(options);
-    };
-
     c3_chart_internal_fn.endall = function (transition, callback) {
         var n = 0;
         transition
@@ -5911,6 +5901,16 @@
         $$.transformTo(targetIds, type, options);
     };
 
+    c3_chart_internal_fn.transformTo = function (targetIds, type, optionsForRedraw) {
+        var $$ = this,
+            withTransitionForAxis = !$$.hasArcType(),
+            options = optionsForRedraw || {withTransitionForAxis: withTransitionForAxis};
+        options.withTransitionForTransform = false;
+        $$.transiting = false;
+        $$.setTargetType(targetIds, type);
+        $$.updateAndRedraw(options);
+    };
+
     c3_chart_fn.groups = function (groups) {
         var $$ = this.internal, config = $$.config;
         if (isUndefined(groups)) { return config[__data_groups]; }

src/api.transform.js

@@ -3,3 +3,13 @@ c3_chart_fn.transform = function (type, targetIds) {
         options = ['pie', 'donut'].indexOf(type) >= 0 ? {withTransform: true} : null;
     $$.transformTo(targetIds, type, options);
 };
+
+c3_chart_internal_fn.transformTo = function (targetIds, type, optionsForRedraw) {
+    var $$ = this,
+        withTransitionForAxis = !$$.hasArcType(),
+        options = optionsForRedraw || {withTransitionForAxis: withTransitionForAxis};
+    options.withTransitionForTransform = false;
+    $$.transiting = false;
+    $$.setTargetType(targetIds, type);
+    $$.updateAndRedraw(options);
+};

src/core.js

@@ -797,16 +797,6 @@ c3_chart_internal_fn.generateResize = function () {
     return callResizeFunctions;
 };
 
-c3_chart_internal_fn.transformTo = function (targetIds, type, optionsForRedraw) {
-    var $$ = this,
-        withTransitionForAxis = !$$.hasArcType(),
-        options = optionsForRedraw || {withTransitionForAxis: withTransitionForAxis};
-    options.withTransitionForTransform = false;
-    $$.transiting = false;
-    $$.setTargetType(targetIds, type);
-    $$.updateAndRedraw(options);
-};
-
 c3_chart_internal_fn.endall = function (transition, callback) {
     var n = 0;
     transition