runtime error fix

files/en-us/webassembly/guides/rust_to_wasm/index.md

@@ -337,9 +337,11 @@ In your `package.json`, you can add `build` and `serve` scripts that will run we
 Next, create a file named `index.js`, and give it these contents:
 
 ```js
-import * as wasm from "hello-wasm";
+import init, { greet } from 'hello-wasm';
 
-wasm.greet("WebAssembly with npm");
+init().then(() => {
+  greet('WebAssembly with npm');
+});
 ```
 
 This imports the module from the `node_modules` folder and calls the `greet` function, passing `"WebAssembly with npm"` as a string. Note how there's nothing special here, yet we're calling into Rust code. As far as the JavaScript code can tell, this is just a normal module.