Add wasm package

backend/sync_wasm/src/lib.rs

@@ -0,0 +1,19 @@
+mod utils;
+
+use wasm_bindgen::prelude::*;
+
+// // When the `wee_alloc` feature is enabled, use `wee_alloc` as the global
+// // allocator.
+// #[cfg(feature = "wee_alloc")]
+// #[global_allocator]
+// static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
+
+// #[wasm_bindgen]
+// extern "C" {
+//     fn alert(s: &str);
+// }
+
+#[wasm_bindgen]
+pub fn greet() -> String {
+    "hi".to_string()
+}