This is an example that shows you how to create a command which makes changes to the document in the active editor.

• commands.registerCommand
• window.activeTextEditor
• TextDocument.getText
• TextEditor.edit
• TextEditorEdit

• contributes.commands

• Run npm install in terminal to install dependencies
• Run the Run Extension target in the Debug View. This will:
  • Start a task npm: watch to compile the code
  • Run the extension in a new VS Code window