feat(core): add fence to make all methods strongly consistent when syncing (#22679)

packages/opencode/src/control-plane/util.ts

@@ -0,0 +1,37 @@
+import { GlobalBus, type GlobalEvent } from "@/bus/global"
+
+export function waitEvent(input: { timeout: number; signal?: AbortSignal; fn: (event: GlobalEvent) => boolean }) {
+  if (input.signal?.aborted) return Promise.reject(input.signal.reason ?? new Error("Request aborted"))
+
+  return new Promise<void>((resolve, reject) => {
+    const abort = () => {
+      cleanup()
+      reject(input.signal?.reason ?? new Error("Request aborted"))
+    }
+
+    const handler = (event: GlobalEvent) => {
+      try {
+        if (!input.fn(event)) return
+        cleanup()
+        resolve()
+      } catch (error) {
+        cleanup()
+        reject(error)
+      }
+    }
+
+    const cleanup = () => {
+      clearTimeout(timeout)
+      GlobalBus.off("event", handler)
+      input.signal?.removeEventListener("abort", abort)
+    }
+
+    const timeout = setTimeout(() => {
+      cleanup()
+      reject(new Error("Timed out waiting for global event"))
+    }, input.timeout)
+
+    GlobalBus.on("event", handler)
+    input.signal?.addEventListener("abort", abort, { once: true })
+  })
+}