add process module

src/process.rs

@@ -0,0 +1,18 @@
+pub fn exit(exit_code: u32) -> ! {
+    inner::exit(exit_code);
+    unreachable!()
+}
+
+pub fn relaunch() {
+    inner::relaunch();
+}
+
+mod inner {
+    use wasm_bindgen::prelude::wasm_bindgen;
+
+    #[wasm_bindgen(module = "/dist/process.js")]
+    extern "C" {
+        pub fn exit(exitCode: u32);
+        pub fn relaunch();
+    }
+}