`extensions`に以下を追加。
```ts
const updateListenerExtension = EditorView.updateListener.of((update) => {
if (update.transactions.some((tr) => tr.isUserEvent("input.complete"))) {
const transaction = update.transactions.find((tr) =>
tr.isUserEvent("input.complete"),
);
if (transaction) {
const selected = (transaction as any).annotations[0]
.value as Suggestion;
// TODO: selected を使って処理を書く
}
}
});
```