Jesus sucks

backend/frontend/node_modules/@restart/hooks/esm/useSet.js

@@ -0,0 +1,49 @@
+import useForceUpdate from './useForceUpdate';
+import useStableMemo from './useStableMemo';
+export class ObservableSet extends Set {
+  constructor(listener, init) {
+    super(init);
+    this.listener = listener;
+  }
+  add(value) {
+    super.add(value);
+    // When initializing the Set, the base Set calls this.add() before the
+    // listener is assigned so it will be undefined
+    if (this.listener) this.listener(this);
+    return this;
+  }
+  delete(value) {
+    const result = super.delete(value);
+    this.listener(this);
+    return result;
+  }
+  clear() {
+    super.clear();
+    this.listener(this);
+  }
+}
+
+/**
+ * Create and return a [Set](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set) that triggers rerenders when it's updated.
+ *
+ * ```ts
+ * const ids = useSet<number>([1,2,3,4]);
+ *
+ * return (
+ *  <>
+ *    {Array.from(ids, id => (
+ *      <div>
+ *        id: {id}. <button onClick={() => ids.delete(id)}>X</button>
+ *      </div>
+ *    )}
+ *  </>
+ * )
+ * ```
+ *
+ * @param init initial Set values
+ */
+function useSet(init) {
+  const forceUpdate = useForceUpdate();
+  return useStableMemo(() => new ObservableSet(forceUpdate, init), []);
+}
+export default useSet;