Custom view decorations in VSCode extension

Question

I\'m building a VS Code extension and it uses a TreeDataProvider to create a list of items. The list has nested children and I would like to show a count for th

Answer 1

Support for custom decorations in views appears to be a work-in-progress. There has been an API for it in the "proposed state" for a while, see:

• Make decoration provider API public (#54938)
• relevant section in vscode.proposed.d.ts

Source Control and Problem decorations already shown in custom views if TreeView.resourceUri is set.

• Source Control decorations are managed via the Source Control API - each SourceControlResourceState instance can have decorations attached to it. That would be how the Git extension you mentioned does it.
• Problem decorations are derived from the "problems" (errors, warnings...) associated with a URI. These are also shown in the Problems panel. Problems can be created using the Diagnostics API or with a problem matcher.