Fix futursolo#120 - don't compile in JsValue in proc_macro. futursolo…

…#121

This gets rid of the compile error:
/usr/bin/ld: __wbindgen_realloc: undefined version: 
          /usr/bin/ld: __wbindgen_malloc: undefined version: 
          /usr/bin/ld: __wbindgen_free: undefined version: 
          /usr/bin/ld: __wbindgen_exn_store: undefined version: 
          /usr/bin/ld: failed to set dynamic section sizes: bad value
          collect2: error: ld returned 1 exit status
          
error: could not compile `stylist-macros` (lib) due to previous error

This is just a test-verification of the below commit by @finnbear

futursolo@9272103

packages/stylist-core/src/error.rs

@@ -1,5 +1,10 @@
 use thiserror::Error;
 
+#[cfg(target_arch = "wasm32")]
+type JsValue = wasm_bindgen::JsValue;
+#[cfg(not(target_arch = "wasm32"))]
+type JsValue = ();
+
 #[derive(Debug, Error, PartialEq)]
 pub enum Error {
     /// Failed to parse CSS.
@@ -16,7 +21,8 @@ pub enum Error {
     ///
     /// This is usually raised when the style element failed to mount.
     #[error("Failed to Interact with Web API. Are you running in Browser?")]
-    Web(Option<wasm_bindgen::JsValue>),
+    Web(Option<JsValue>),
+
 
     /// Failed to read styles from the StyleManager.
     ///