Download and install the Node.js framework. The framework is required for two reasons:
- The CoffeeScript transpiler is started through Node.js.
- The Node Package Manager (npm), which is a part of the framework, is also the easiest way to download the transpiler.
For details on using Node.js in WebStorm, see the section Node.js
Make sure the following paths are added to the PATH variable:
- The path to the parent folder of the Node.js executable file.
- The path to the Node Package Manager folder (npm). This enables you to launch .
- Make sure the Node.js plugin is enabled. The plugin is bundled with WebStorm and activated by default. If it is not, enable the plugin.
- Make sure the File Watchers plugin is enabled. The plugin is bundled with WebStorm and activated by default. If it is not, enable the plugin.
Download and install the CoffeeScript transpiler. The easiest way is to use the Node Package Manager (npm), which is a part of Node.js.
- Switch to the directory where the Node Package Manager (npm) is stored or define a path variable for its parent folder so it is available from any folder.
Do one of the following depending on your further plans:
npm install coffee-script
To debug your code, you will need source maps that set correspondence between lines in your CoffeeScript code and the generated
otherwise your breakpoints will not be recognised and processed correctly. Source maps are generated by the coffee-script-redux transpiling tool.
Type the following command at the command line prompt:
npm install coffee-script-redux
In either case, the tool is installed under Node.js so Node.js, which is required for starting the tool, will be specified in the path to it.
The executable files of both transpilers have the same name coffee.cmd (though luckily differ in contents). Therefore to have both tools available, you need to rename the executable of the one that was downloaded first or move it to another folder under Node.js.
WebStorm provides a common procedure and user interface for creating File Watchers of all types. The only difference is in the predefined templates you choose in each case.
- To start creating a File Watcher, open the Project Settings and click File Watchers. The File Watchers page that opens, shows the list of File Watchers that are already configured in the project.
Click the Add button or press Alt+InsertAlt+InsertAlt+InsertAlt+InsertAlt+InsertAlt+InsertAlt+Insert or Ctrl+NAlt+InsertCommand N or Control EnterControl N or Control EnterCommand N or Control Enter
and choose the predefined template from the pop-up list.
- If you are going to debug your code, choose CoffeeScript Source Map. As a result, the source maps will be created.
- In the Program text box, specify the path to the coffee.cmd file. Type the path manually or click the Browse button and choose the file location in the dialog box that opens.
- Proceed as described on page Using File Watchers.
Transpiling the CoffeeScript code
When you open a CoffeeScript file, WebStorm checks whether an applicable file watcher is available in the current project. If such file watcher is configured but disabled, WebStorm displays a pop-up window that informs you about the configured file watcher and suggests to enable it.
If an applicable file watcher is configured and enabled in the current project, WebStorm starts it automatically upon the event specified in the New Watcher dialog.
- If the Immediate file synchronization check box is selected, the File Watcher is invoked as soon as any changes are made to the source code.
- If the Immediate file synchronization check box is cleared, the File Watcher is started upon save ( , Ctrl+SCtrl+SCtrl+SCtrl+SCtrl+X, Ctrl+SCtrl+SCtrl+S or Ctrl+Shift+SCtrl+SCommand SCommand SCommand S) or when you move focus from WebStorm (upon frame deactivation).
The transpiler stores the generated output in a separate file. The file has the name of the source CoffeeScript file and the extension js or js.map depending on the transpiler type. The location of the generated files is defined in the Output Paths text box of the New Watcher dialog. Based on this setting, WebStorm detects transpiler output. However, in the Project Tree, they are shown under the source .coffee file which is now displayed as a node.
WebStorm can perform static analyses of your CoffeeScript code without actually running a transpiler and display the predicted transpilation output in the dedicated read-only viewer.
- Open the desired CoffeeScript file in the editor, and right-click the editor background.