feat: update fetch

__wasm/wit-bindgen-sample/engine/src/lib.rs

@@ -1,6 +1,6 @@
 use boa_engine::{Context, JsResult, JsString, JsValue};
 use serde::{Deserialize, Serialize};
-use serde_json::Value;
+use serde_json::{Map, Value};
 wit_bindgen_rust::export!("../exports.wit");
 wit_bindgen_rust::import!("../container.wit");
 
@@ -28,15 +28,14 @@ struct FetchResult {
 }
 
 fn fetch_fn(_: &JsValue, args: &[JsValue], ctx: &mut Context) -> JsResult<JsValue> {
-    let mut options = String::new();
-    options.push('[');
-    args.iter().enumerate().for_each(|(i, arg)| {
-        if i > 0 { options.push(','); }
-        options.push_str(arg.to_json(ctx).expect("to json error").as_str().expect("as str error"))
-    });
-    options.push(']');
-    // let r = serde_json::to_string(args).unwrap();
-    let fetch_result_string = container::fetch(&options);
+    let mut fetch_params_map = Map::new();
+    fetch_params_map.insert("url".to_string(), args[0].to_json(ctx).expect("error"));
+    if args.len() > 1 {
+        fetch_params_map.insert("params".to_string(), args[1].to_json(ctx).expect("error"));
+    }
+    let fetch_params = format!("{}", Value::Object(fetch_params_map));
+    
+    let fetch_result_string = container::fetch(&fetch_params);
     let fetch_result: FetchResult = serde_json::from_str(&fetch_result_string).expect("from str error");
     if let Some(result) = fetch_result.result {
         let r: Value = serde_json::from_str(&result).expect("result from str error");