[tsserver] Support for "Search Hierarchy Type"

[angelozerr]

It should be cool if tsserver could provide a new command "findHierarchyType" to retrieve list of types which implement an interface.

In other words I would like to provide te same feature than Eclipse plugins for Java inside typescript.java: open a popup which displays list of types (MyServiceA, MyServiceB etc) which implement an interface (IService):

[DanielRosenwasser]

Are you asking about something like an "implement interface" command?

[sandersn]

Sounds more like a restricted "find all references" that only shows references for I that have implements I. I remember using this with C# too, and it's quite useful.

[DanielRosenwasser]

So find all implementations?

[angelozerr]

Are you asking about something like an "implement interface" command?

Yes.

So find all implementations?

Exactly!

[angelozerr]

It seems that #10482 should fix this issue?

[micaelgallego]

Maybe it can be implemented calling to this command several times (once per node in the hierarchy tree). But maybe it is too slow

[RyanCavanaugh]

Taking #10482 as the definitive fix