Refactor model sync scheduling

packages/common-lib/eagerDebounceAsync.ts

@@ -0,0 +1,36 @@
+export function eagerDebounceAsync(fn: () => Promise<void>, delay: number) {
+  let timer: ReturnType<typeof setTimeout> | null = null;
+  let inFlight: Promise<void> | null = null;
+  let runAfterInFlight = false;
+
+  const run = async () => {
+    if (inFlight != null) {
+      runAfterInFlight = true;
+      return;
+    }
+
+    runAfterInFlight = false;
+    inFlight = fn()
+      .catch(console.error)
+      .finally(() => {
+        inFlight = null;
+        if (runAfterInFlight && timer == null) {
+          void run();
+        }
+      });
+    await inFlight;
+  };
+
+  return () => {
+    if (timer == null) {
+      void run();
+    } else {
+      clearTimeout(timer);
+    }
+
+    timer = setTimeout(() => {
+      timer = null;
+      void run();
+    }, delay);
+  };
+}