4.2.0版本 removeListener = BoostChannel.instance.addEventListener("yourEventKey", (key, arguments) { ///deal with your event here return; });

4.2.0版本 按照文档接入，在flutter接收事件的方法，报错：
removeListener = BoostChannel.instance.addEventListener("yourEventKey", (key, arguments) {
///deal with your event here

return;
});

这个方法报错，烦请完善开发文档

Start with the 4.2.0 documentation for the Flutter BoostChannel.addEventListener example and reproduce the reported error using the issue's snippet. Done means the event-receiving instructions and example are corrected so the documented integration no longer produces the reported error.

Written by the indexing model from the issue text.