[WIP] add parameter to async function --> error (#1973)

* add parameter to async function --> error

This change to the fetch example does not compile.
It would be great to include how to do this!

* fn parameter as String

Author: ultrasaurus

examples/fetch/index.js

@@ -2,7 +2,7 @@ const rust = import('./pkg');
 
 rust
   .then(m => {
-      return m.run().then((data) => {
+      return m.run("rustwasm/wasm-bindgen").then((data) => {
           console.log(data);
 
           console.log("The latest commit to the wasm-bindgen %s branch is:", data.name);

examples/fetch/src/lib.rs

@@ -33,13 +33,15 @@ pub struct Signature {
 }
 
 #[wasm_bindgen]
-pub async fn run() -> Result<JsValue, JsValue> {
+pub async fn run(repo: String) -> Result<JsValue, JsValue> {
     let mut opts = RequestInit::new();
     opts.method("GET");
     opts.mode(RequestMode::Cors);
 
+    let url = format!("https://api.github.com/repos/{}/branches/master", repo);
+
     let request = Request::new_with_str_and_init(
-        "https://api.github.com/repos/rustwasm/wasm-bindgen/branches/master",
+        &url,
         &opts,
     )?;