planning

node_modules/react-dnd-html5-backend/dist/esm/utils/js_utils.js

@@ -0,0 +1,38 @@
+// cheap lodash replacements
+export function memoize(fn) {
+  var result = null;
+
+  var memoized = function memoized() {
+    if (result == null) {
+      result = fn();
+    }
+
+    return result;
+  };
+
+  return memoized;
+}
+/**
+ * drop-in replacement for _.without
+ */
+
+export function without(items, item) {
+  return items.filter(function (i) {
+    return i !== item;
+  });
+}
+export function union(itemsA, itemsB) {
+  var set = new Set();
+
+  var insertItem = function insertItem(item) {
+    return set.add(item);
+  };
+
+  itemsA.forEach(insertItem);
+  itemsB.forEach(insertItem);
+  var result = [];
+  set.forEach(function (key) {
+    return result.push(key);
+  });
+  return result;
+}