OpenTUI is here (#2685)

packages/opencode/src/util/signal.ts

@@ -0,0 +1,12 @@
+export function signal() {
+  let resolve: any
+  const promise = new Promise((r) => (resolve = r))
+  return {
+    trigger() {
+      return resolve()
+    },
+    wait() {
+      return promise
+    },
+  }
+}