added hello-world wasm example and npmPackage nix derivation

src/lib.rs

@@ -3,6 +3,8 @@
 
 static PROTO_VERSION: u8 = 1;
 
+// the core part houses the code that can run on any platform
+/*
 pub mod core {
     pub mod memstore;
     pub mod instance;
@@ -14,7 +16,12 @@ pub mod core {
 }
 
 pub use core::*;
-
+// */
+
+pub mod platform {
+    #[cfg(feature = "wasm-target")]
+    pub mod wasm;
+}
 
 
 

src/platform/wasm/mod.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 {
+    fn alert(s: &str);
+}
+
+#[wasm_bindgen]
+pub fn greet() {
+    alert("Hello, wasm-game-of-life!");
+}