initial commit

node_modules/drag-helper/utils/once.js

@@ -0,0 +1,17 @@
+'use once'
+
+module.exports = function once(fn, scope){
+
+    var called
+    var result
+
+    return function(){
+        if (called){
+            return result
+        }
+
+        called = true
+
+        return result = fn.apply(scope || this, arguments)
+    }
+}