Wasm target check before build (#1689)

* Add `rustup show` check for wasm32 target

* better place for check

* fmt

* clippy fmt

packages/web/src/hot_reload.rs

@@ -5,7 +5,6 @@ use futures_channel::mpsc::UnboundedReceiver;
 use dioxus_core::Template;
 
 pub(crate) fn init() -> UnboundedReceiver<Template<'static>> {
-    use std::convert::TryInto;
     use wasm_bindgen::closure::Closure;
     use wasm_bindgen::JsCast;
     use web_sys::{MessageEvent, WebSocket};
@@ -31,14 +30,12 @@ pub(crate) fn init() -> UnboundedReceiver<Template<'static>> {
     // change the rsx when new data is received
     let cl = Closure::wrap(Box::new(move |e: MessageEvent| {
         if let Ok(text) = e.data().dyn_into::<js_sys::JsString>() {
-            let text: Result<String, _> = text.try_into();
-            if let Ok(string) = text {
-                let val = serde_json::from_str::<serde_json::Value>(&string).unwrap();
-                // leak the value
-                let val: &'static serde_json::Value = Box::leak(Box::new(val));
-                let template: Template<'_> = Template::deserialize(val).unwrap();
-                tx.unbounded_send(template).unwrap();
-            }
+            let string: String = text.into();
+            let val = serde_json::from_str::<serde_json::Value>(&string).unwrap();
+            // leak the value
+            let val: &'static serde_json::Value = Box::leak(Box::new(val));
+            let template: Template<'_> = Template::deserialize(val).unwrap();
+            tx.unbounded_send(template).unwrap();
         }
     }) as Box<dyn FnMut(MessageEvent)>);