Type hierarchy api support

[mjbvz]

Suggestion

🔍 Search Terms

• type hierarchy
• inheritance
• subclass
• superclass

List of keywords you searched for before creating this issue. Write them down here so that others can find this suggestion more easily and help provide feedback.

⭐ Suggestion

VS Code recently introduced a new API for displaying type hierarchies:

• Create a "TypeHierarchyProvider" api for visualising type hierarchies vscode#15533
• api

This api is very similar to the exiting call hierarchy api and displayed in a similar way in the editor

Although type hierarchies are most useful for languages like Java that use inheritance heavily, they would also be a nice feature to support for JavaScript and TypeScript