v8: inspect unserializable objects

This would otherwise sometimes just print relatively useless
information about the value in question, such as `[object Object]`.

PR-URL: https://github.com/nodejs/node/pull/30167
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: David Carlier <devnexen@gmail.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/lib/v8.js b/lib/v8.js
index 1a8c70c6d7..5be59cb935 100644
--- a/lib/v8.js
+++ b/lib/v8.js
@@ -24,6 +24,7 @@ const {
 } = internalBinding('serdes');
 const assert = require('internal/assert');
 const { copy } = internalBinding('buffer');
+const { inspect } = require('internal/util/inspect');
 const { FastBuffer } = require('internal/buffer');
 const { getValidatedPath } = require('internal/fs/utils');
 const { toNamespacedPath } = require('path');
@@ -242,7 +243,8 @@ class DefaultSerializer extends Serializer {
       i = arrayBufferViewTypeToIndex.get(tag);
 
       if (i === undefined) {
-        throw new this._getDataCloneError(`Unknown host object type: ${tag}`);
+        throw new this._getDataCloneError(
+          `Unserializable host object: ${inspect(abView)}`);
       }
     }
     this.writeUint32(i);