(feat): redesign WASM module, add TypeScript SDK, migrate to pnpm

wasm/src/subscription.rs

@@ -0,0 +1,44 @@
+use std::collections::HashMap;
+
+use wasm_bindgen::prelude::*;
+
+/// Minimal message router used by higher-level SDK subscription code.
+#[wasm_bindgen]
+pub struct WasmSubscriptionRouter {
+    handlers: HashMap<String, js_sys::Function>,
+}
+
+#[wasm_bindgen]
+impl WasmSubscriptionRouter {
+    #[wasm_bindgen(constructor)]
+    pub fn new() -> Self {
+        Self {
+            handlers: HashMap::new(),
+        }
+    }
+
+    #[wasm_bindgen]
+    pub fn subscribe(&mut self, message_type: String, callback: js_sys::Function) {
+        self.handlers.insert(message_type, callback);
+    }
+
+    #[wasm_bindgen]
+    pub fn unsubscribe(&mut self, message_type: &str) -> bool {
+        self.handlers.remove(message_type).is_some()
+    }
+
+    #[wasm_bindgen]
+    pub fn dispatch(&self, message_type: &str, message: JsValue) -> bool {
+        let Some(callback) = self.handlers.get(message_type) else {
+            return false;
+        };
+        let _ = callback.call1(&JsValue::NULL, &message);
+        true
+    }
+}
+
+impl Default for WasmSubscriptionRouter {
+    fn default() -> Self {
+        Self::new()
+    }
+}