# Welcome to your first VS Code Extension ## What's in the folder * This folder contains all of the files necessary for your extension * `package.json` - this is the manifest file in which you declare your extension and command. The sample plugin registers a command and defines its title and command name. With this information VS Code can show the command in the command palette. It doesn’t yet need to load the plugin. * `src/extension.ts` - this is the main file where you will provide the implementation of your command. The file exports one function, `activate`, which is called the very first time your extension is activated (in this case by executing the command). Inside the `activate` function we call `registerCommand`. We pass the function containing the implementation of the command as the second parameter to `registerCommand`. ## Get up and running straight away * press `F5` to open a new window with your extension loaded * run your command from the command palette by pressing (`Ctrl+Shift+P` or `Cmd+Shift+P` on Mac) and typing `Hello World` * set breakpoints in your code inside `src/extension.ts` to debug your extension * find output from your extension in the debug console ## Make changes * you can relaunch the extension from the debug toolbar after changing code in `src/extension.ts` * you can also reload (`Ctrl+R` or `Cmd+R` on Mac) the VS Code window with your extension to load your changes ## Explore the API * you can open the full set of our API when you open the file `node_modules/vscode/vscode.d.ts` ## Run tests * open the debug viewlet (`Ctrl+Shift+D` or `Cmd+Shift+D` on Mac) and from the launch configuration dropdown pick `Launch Tests` * press `F5` to run the tests in a new window with your extension loaded * see the output of the test result in the debug console * make changes to `test/extension.test.ts` or create new test files inside the `test` folder * by convention, the test runner will only consider files matching the name pattern `**.test.ts` * you can create folders inside the `test` folder to structure your tests any way you want