1 files changed, 15 insertions, 12 deletions
diff --git a/cli/ops/dispatch_json.rs b/cli/ops/dispatch_json.rs
index 6e0eddac8..031e10c51 100644
--- a/cli/ops/dispatch_json.rs
+++ b/cli/ops/dispatch_json.rs
@@ -24,17 +24,19 @@ pub enum JsonOp {
 }
 
 pub fn serialize_result(
-  rust_err_to_json_fn: &'static dyn deno_core::RustErrToJsonFn,
   promise_id: Option<u64>,
   result: JsonResult,
+  get_error_class_fn: deno_core::GetErrorClassFn,
 ) -> Buf {
   let value = match result {
     Ok(v) => json!({ "ok": v, "promiseId": promise_id }),
-    Err(err) => {
-      let serialized_err = (&rust_err_to_json_fn)(&err);
-      let err_value: Value = serde_json::from_slice(&serialized_err).unwrap();
-      json!({ "err": err_value, "promiseId": promise_id })
-    }
+    Err(err) => json!({
+      "err": {
+        "className": (get_error_class_fn)(&err),
+        "message": err.to_string()
+      },
+      "promiseId": promise_id
+    }),
   };
   serde_json::to_vec(&value).unwrap().into_boxed_slice()
 }
@@ -56,12 +58,13 @@ where
   ) -> Result<JsonOp, ErrBox>,
 {
   move |isolate_state: &mut CoreIsolateState, zero_copy: &mut [ZeroCopyBuf]| {
+    let get_error_class_fn = isolate_state.get_error_class_fn;
+
     assert!(!zero_copy.is_empty(), "Expected JSON string at position 0");
-    let rust_err_to_json_fn = isolate_state.rust_err_to_json_fn;
     let async_args: AsyncArgs = match serde_json::from_slice(&zero_copy[0]) {
       Ok(args) => args,
       Err(e) => {
-        let buf = serialize_result(rust_err_to_json_fn, None, Err(e.into()));
+        let buf = serialize_result(None, Err(e.into()), get_error_class_fn);
         return Op::Sync(buf);
       }
     };
@@ -77,18 +80,18 @@ where
       Ok(JsonOp::Sync(sync_value)) => {
         assert!(promise_id.is_none());
         Op::Sync(serialize_result(
-          rust_err_to_json_fn,
           promise_id,
           Ok(sync_value),
+          get_error_class_fn,
         ))
       }
       Ok(JsonOp::Async(fut)) => {
         assert!(promise_id.is_some());
         let fut2 = fut.then(move |result| {
           futures::future::ready(serialize_result(
-            rust_err_to_json_fn,
             promise_id,
             result,
+            get_error_class_fn,
           ))
         });
         Op::Async(fut2.boxed_local())
@@ -97,16 +100,16 @@ where
         assert!(promise_id.is_some());
         let fut2 = fut.then(move |result| {
           futures::future::ready(serialize_result(
-            rust_err_to_json_fn,
             promise_id,
             result,
+            get_error_class_fn,
           ))
         });
         Op::AsyncUnref(fut2.boxed_local())
       }
       Err(sync_err) => {
         let buf =
-          serialize_result(rust_err_to_json_fn, promise_id, Err(sync_err));
+          serialize_result(promise_id, Err(sync_err), get_error_class_fn);
         if is_sync {
           Op::Sync(buf)
         } else {