planning

node_modules/react-dnd-html5-backend/lib/utils/js_utils.d.ts

@@ -0,0 +1,6 @@
+export declare function memoize<T>(fn: () => T): () => T;
+/**
+ * drop-in replacement for _.without
+ */
+export declare function without<T>(items: T[], item: T): T[];
+export declare function union<T extends string | number>(itemsA: T[], itemsB: T[]): T[];

node_modules/react-dnd-html5-backend/lib/utils/js_utils.js

@@ -0,0 +1,26 @@
+// cheap lodash replacements
+export function memoize(fn) {
+    let result = null;
+    const memoized = () => {
+        if (result == null) {
+            result = fn();
+        }
+        return result;
+    };
+    return memoized;
+}
+/**
+ * drop-in replacement for _.without
+ */
+export function without(items, item) {
+    return items.filter((i) => i !== item);
+}
+export function union(itemsA, itemsB) {
+    const set = new Set();
+    const insertItem = (item) => set.add(item);
+    itemsA.forEach(insertItem);
+    itemsB.forEach(insertItem);
+    const result = [];
+    set.forEach((key) => result.push(key));
+    return result;
+}