Inlay hints

[qaisjp]

Problem

Inlay hints add additional inline information to source code to help you understand what the code does.

vscode-go supports inlay hints, it looks like this (source)

TypeScript inlay hints look like this (source with more images)

Proposed solution

• [ ] Implement the part of the LSP described in https://github.com/microsoft/language-server-protocol/issues/956.

  VS Code has shipped with a finalized native API for this.

• [ ] Provide a granular choice of inlay hints (similar settings to vscode-go / typescript): search for inlay in VS Code's Settings UI

[froydnj]

Do you know if we are required to implement InlayHintsProvider in the extension? I have a branch that implements what I thought was most of the spec, but I do not see VSCode requesting inlay hints in the logs.

[qaisjp]

Do you know if we are required to implement InlayHintsProvider in the extension?

I don't think so.

• I skimmed through all the changelists linked by @gopherbot on https://github.com/golang/vscode-go/issues/1631, and I'm not seeing any signifiant TypeScript changes in their extension.
• I also searched in their vscode-go repo, and found the same changes I found in the changelists.
• Their TypeScript changes are only propagating their custom extension settings to the gopls (LSP) config.