type field in exportJSON for custom nodes

[IsmailElShinnawy]

Hi, I have been trying to implement an exportJSON method for CustomHeadingNode which extends HeadingNode, the problem is that SerializedHeadingNode type enforces that the type of the attribute type to be "heading", but I want the custom exportJSON to return type: "custom_heading".
As a temporary solution for now I typecast the returned json to SerializedHeadingNode, is there a cleaner approach for this?

Sandbox: https://codesandbox.io/s/flamboyant-brown-ojhvtq

[moy2010]

The cleaner way would be to either create a PR so that the exportJSON method in HeadingNode doesn't return SerializedHeadingNode but SerializedElementNode. Otherwise you can extend ElementNode instead of HeadingNode so that you don't have such type bound.