Switch from Rc<RefCell> to Arc<Mutex<T>> or Arc<ReentrantMutex<RefCell<T>>>.

helwasm/src/lib.rs

@@ -1,3 +1,5 @@
+#[macro_use]
+extern crate lazy_static;
 extern crate hel;
 
 use wasm_bindgen::prelude::*;
@@ -6,3 +8,9 @@ use wasm_bindgen::prelude::*;
 pub fn ok_add(a: i32, b: i32) -> i32 {
     a + b + 1
 }
+
+mod hel_state;
+
+#[wasm_bindgen]
+pub fn hel_init() {
+}