# Welcome to your 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/@types/vscode/index.d.ts`.
## Run tests
* Open the debug viewlet (`Ctrl+Shift+D` or `Cmd+Shift+D` on Mac) and from the launch configuration dropdown pick `Extension 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 `src/test/suite/extension.test.ts` or create new test files inside the `test/suite` folder.
  * The provided 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.
## Go further
 * Reduce the extension size and improve the startup time by [bundling your extension](https://code.visualstudio.com/api/working-with-extensions/bundling-extension).
 * [Publish your extension](https://code.visualstudio.com/api/working-with-extensions/publishing-extension) on the VSCode extension marketplace.
 * Automate builds by setting up [Continuous Integration](https://code.visualstudio.com/api/working-with-extensions/continuous-integration).