Merge pull request #64 from golemcloud/better-js-error-detection

Better JS Error detection

Author: noise64

crates/wasm-rquickjs/skeleton/src/internal.rs

@@ -671,7 +671,13 @@ pub fn format_js_exception(exc: &Value) -> String {
 }
 
 pub fn try_format_js_error(err: &Value) -> Option<String> {
+    let error_ctor: Object = err.ctx().globals().get("Error").ok()?;
     let obj = err.as_object()?;
+
+    if !obj.is_instance_of(error_ctor) {
+        return None;
+    }
+
     let message: Option<String> = obj.get("message").ok();
     let stack: Option<String> = obj.get("stack").ok();