LSP: Support for typescript / typescript-language-server's "Go to Source Definition" command

[ajbuz]

Problem

It appears this hasn't been discussed here but TypeScript 4.7 adds support for a new editor command called "Go To Source Definition" _typescript.goToSourceDefinition and It would be really helpful if you could also provide support for it.
More info & demo can be found in release notes.

Thank you.

Expected behavior

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[clason]

That's not in the LSP specification, though, so out of scope for us. @MariaSolOs

[justinmk]

We will not add explicit support for server-specific commands. However we do need a general mechanism that makes it easy for users (and nvim-lspconfig) to:

1. iterate through discovered server capabilities / commands
2. define aliases to commands, in a non-verbose way

The current situation with nvim-lspconfig is that 10 lines of code are needed to define commands. That's unsustainable.

See also neovim/nvim-lspconfig#1937

[justinmk]

@clason unless we have an existing issue, I'd like to keep this open to track the above idea

[clason]

I would strongly prefer a targeted issue about general server-specific commands. Adding individual commands is out of scope, and re-using this issue will give the wrong impression.

[justinmk]

I would strongly prefer a targeted issue about general server-specific commands

Stubbed in #28329 , improvements welcome