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A subtle but critical issue that can break your sidebar webviews silently. Here's how to fix it. I recently spent hours debugging an issue that should have taken five minutes to identify. I was building a sidebar dashboard for my VS Code extension HookGuard using the WebviewViewProvider API. Everything seemed wired up correctly: ✅ The provider was registered ✅ The view appeared in the sidebar ✅ The extension was activating ❌ But resolveWebviewView() was never called. No logs. No errors. Just silence. ⚠️ The Problem Despite what the documentation suggests (at least at the time of writing), simply defining a view in your package.json with a valid id and associating it with a WebviewViewProvider isn't enough. VS Code will happily display your view without ever invoking your provider unless you explicitly define the view type as webview.

May 18, 2025 - 02:00
 0

A subtle but critical issue that can break your sidebar webviews silently. Here's how to fix it.

I recently spent hours debugging an issue that should have taken five minutes to identify. I was building a sidebar dashboard for my VS Code extension HookGuard using the WebviewViewProvider API. Everything seemed wired up correctly:

  • ✅ The provider was registered
  • ✅ The view appeared in the sidebar
  • ✅ The extension was activating

❌ But resolveWebviewView() was never called. No logs. No errors. Just silence.

⚠️ The Problem

Despite what the documentation suggests (at least at the time of writing), simply defining a view in your package.json with a valid id and associating it with a WebviewViewProvider isn't enough.

VS Code will happily display your view without ever invoking your provider unless you explicitly define the view type as webview.

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