Import AITURK IDE 1.0.0-beta.1 from Hermes 63279301; preserve MIT license

apps/desktop/src/lib/raf-coalesce.ts

@@ -0,0 +1,34 @@
+/** Coalesce a stream of values (pointermove positions, resize deltas) to one
+ *  `apply` per animation frame, so a drag can't drive several layouts per frame.
+ *  `push` records the latest value and schedules a frame; `finish` commits the
+ *  last value and cancels any pending frame (call it on pointerup/cancel).
+ *  `null` is the empty sentinel, so `T` must never legitimately be `null`. */
+export function rafCoalesce<T>(apply: (value: T) => void): { finish: () => void; push: (value: T) => void } {
+  let frame: null | number = null
+  let pending: null | T = null
+
+  const flush = () => {
+    frame = null
+
+    if (pending !== null) {
+      apply(pending)
+    }
+  }
+
+  return {
+    finish() {
+      if (frame !== null) {
+        cancelAnimationFrame(frame)
+        frame = null
+      }
+
+      if (pending !== null) {
+        apply(pending)
+      }
+    },
+    push(value) {
+      pending = value
+      frame ??= requestAnimationFrame(flush)
+    }
+  }
+}