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()
+}

backend/sync_wasm/src/utils.rs

@@ -0,0 +1,10 @@
+pub fn set_panic_hook() {
+    // When the `console_error_panic_hook` feature is enabled, we can call the
+    // `set_panic_hook` function at least once during initialization, and then
+    // we will get better error messages if our code ever panics.
+    //
+    // For more details see
+    // https://github.com/rustwasm/console_error_panic_hook#readme
+    #[cfg(feature = "console_error_panic_hook")]
+    console_error_panic_hook::set_once();
+}