WebIDL serializer has been deprecated in favor of toJSON operation

[tobie]

Hi!

We recently deprecated WebIDL serializers. You can now directly specify toJSON operations instead, which you previously weren't allowed to do.

To deal with common cases, we added a new [Default] extended attribute which triggers the default toJSON operation that behaves similarly to how serializers={attributes} or serializers={attributes, inherit} used to. That is, it serializes all attributes that are of a JSON type into a vanilla JSON object.

It seems only the following interface in this spec is impacted by this change:

• PerformanceEntry

It's a good candidate for the default toJSON operation, so the below should be all you need:

[Exposed=(Window,Worker)]
interface PerformanceEntry {
    readonly attribute DOMString           name;
    readonly attribute DOMString           entryType;
    readonly attribute DOMHighResTimeStamp startTime;
    readonly attribute DOMHighResTimeStamp duration;
    [Default] object toJSON();
};

I'm sorry for the inconvenience this causes, but our hope is that this ultimately makes things a lot simpler and clearer for everybody.

Please feel free to reach out if you have any questions.

Thanks!