Add WASM bindings and web project structure

packages/wasm-bindings/src/lib.rs

@@ -1,7 +1,18 @@
-#[cfg(test)]
-mod tests {
-	#[test]
-	fn it_works() {
-		assert_eq!(2 + 2, 4);
-	}
+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() {
+	alert("Hello, Graphite!");
 }

packages/wasm-bindings/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();
+}