VS Code Extension Patterns

TreeDataProvider is VS Code's pattern for building hierarchical tree views. Implement getChildren() and getTreeItem() methods to define your tree structure, then refresh the view using the event emitter when data changes. This handles dynamic updates and user interactions automatically.

Register commands in your extension's activate() function using vscode.commands.registerCommand(), binding each command to a handler function. Return disposables to clean up on deactivation. This ensures predictable lifecycle management and proper error handling for user-triggered actions.

VS Code calls activate() when your extension loads and deactivation hook when it unloads. Store resource references and return disposables from activate() to release them cleanly. This pattern prevents memory leaks and ensures stable behavior across session changes.

Yes, use vscode.workspace.onDidChangeConfiguration to listen for setting updates. Re-read configuration values and refresh UI elements as needed. This keeps your extension synchronized with user preferences without requiring a restart.

Use vscode.workspace.createFileSystemWatcher() to monitor file changes, then trigger TreeDataProvider refresh or update internal state. Combine with error handling to manage edge cases like permission denials or rapid file modifications.

Catch errors at command boundaries and display messages via vscode.window.showErrorMessage(). Log details internally for debugging. This separates user-facing feedback from diagnostic information and prevents silent failures.