Playground doesn't seem to dim unused using

[timotheeguerin]

Simple code

import "@typespec/http";

using Http;

playground

Doesn't show using Http dimmed like in IDE.

[github-actions]

🎯 Issue Triage

The TypeSpec playground does not visually dim unused using statements, unlike the VS/VSCode IDE which correctly grays them out as a hint that they're unused.

Category: Bug
Area: ui:playground

🔗 [Playground Reproduction]((typespec.io/redacted)

📋 Reproduction code

import "`@typespec/http`";

using Http;

🔍 Analysis

• The IDE (VS/VSCode) correctly dims using statements that are unused via a semantic token/decoration provided by the language server.
• The playground uses Monaco editor, which may not be receiving or applying the same "unused" semantic token styling that the language server sends for unused using statements.
• This is likely a missing or misconfigured semantic token provider or CSS styling in the playground's Monaco integration (packages/playground).
• No duplicate found.

📝 Suggested next steps

• Check if the playground's Monaco editor is configured to handle semantic tokens for unused using statements (compare with the VSCode extension setup).
• Verify whether the language server sends the correct semantic token for unused namespaces in the playground context.
• Apply matching CSS/theme rules so dimmed tokens render correctly in the Monaco playground editor.

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