Enable IntelliSense in staged files

[mjbvz]

From microsoft/vscode#268520

Repo

1. Staged a .ts file in VS Code using the scm view
2. In the scm view, click on the staged file to open it in an editor
3. Try using go to symbol or go to definition in the editor

Bug
Nothing happens

We should be able to enable syntax only features in these files, such the document outline (go to symbol)

Would be great to support go to definition too

[jakebailey]

This is also sort of not in our control; how was TS able to do this before?

[mjbvz]

Not sure how this works in the LSP but in VS Code these documents are exposed using uris like this:

git:/Users/matb/projects/sandbox/test/server.js?%7B%22path%22%3A%22%2FUsers%2Fmatb%2Fprojects%2Fsandbox%2Ftest%2Fserver.js%22%2C%22ref%22%3A%22%22%7D

The query string contains the original path as json:

{\"path\":\"/Users/matb/projects/sandbox/test/server.js\",\"ref\":\"\"}

We don't properly support this today but it would be great to enable the syntax features at least

[jakebailey]

In typescript-language-features, you were opening those up? Did other features work or was it more like untitled files?

We can technically match more of these in the client, but like tsserver, we don't actually support arbitrary URIs, and I would be genuinely surprised if that actually was able to add the temp file to the program or something

[mjbvz]

We ignored git: files because of the challenges using working with non-file uris. However we do support other file schemes for virtual file systems. Would love to see TS-go offer basic support for those now that you're using using the LSP

[jakebailey]

Ah, so this is a feature request, not a bug report?