VS Code Extension API

The VS Code Extension API is a robust set of JavaScript APIs for customizing nearly every aspect of the editor, from the UI to core editing features.

This API provides the necessary hooks for deep editor integration: you can extend the workbench, add custom views (Webviews), or register new commands (via `vscode.commands`). It's the engine behind key functionalities like custom language support (IntelliSense, diagnostics), debugging, and theme creation. Use the `vscode` namespace to access critical components like `vscode.window` for user interaction or `vscode.workspace` for file system operations. The entire platform is built on this extensibility, meaning your extensions integrate seamlessly and powerfully.

https://code.visualstudio.com/api