vscode-extension-expert

VS Code extension architecture starts with configuring activation events and contribution points in package.json. Define when your extension activates (e.g., onCommand, onLanguage) and what commands or UI elements it contributes, then implement handlers in your main extension file to satisfy those declared capabilities.

Implement Content Security Policy (CSP) headers and nonce-based script injection in WebViews to prevent XSS attacks. Load resources only from trusted sources, sanitize user input, and use VS Code's messaging API to communicate securely between the extension host and WebView context.

Design LSP features by defining server capabilities in your language server initialization, then implement handlers for requests like hover, completion, and diagnostics. Connect your VS Code extension client to the server using vscode-languageclient, which manages the protocol communication and lifecycle.

Prepare your extension for publishing by optimizing startup performance, packaging with vsce, and configuring metadata in package.json. Test activation events and contribution points thoroughly, verify security practices, then create a publisher account and push your package to the Marketplace.

Debug VS Code extensions using the built-in debugger by launching with F5, which attaches to both the extension host and renderer processes. Set breakpoints in your code, inspect variables, and use the Debug Console to test VS Code API calls and diagnose activation or messaging failures.