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:
    = note: - the trait `Sync` is not implemented for `RefCell<Option<Sender<()>>>`
    = help: consider using an `Rc` instead. `Arc` does not provide benefits for non `Send` and `Sync` types
    = note: if you intend to use `Arc` with `Send` and `Sync` traits
    = note: wrap the inner type with a `Mutex` or implement `Send` and `Sync` for `RefCell<Option<Sender<()>>>`
    = 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