warning: usage of an `Arc` that is not `Send` and `Sync`
   --> client/src/wasm_websocket.rs:113:24
    |
113 |         let ready_tx = Arc::new(RefCell::new(Some(ready_tx)));
    |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `Arc<RefCell<Option<Sender<()>>>>` is not `Send` and `Sync` as `RefCell<Option<Sender<()>>>` is not `Sync`
    = help: if the `Arc` will not used be across threads replace it with an `Rc`
    = help: otherwise make `RefCell<Option<Sender<()>>>` `Send` and `Sync` or consider a wrapper type such as `Mutex`
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#arc_with_non_send_sync
    = note: `#[warn(clippy::arc_with_non_send_sync)]` on by default