In IntelliJ IDEA, transpiler configurations are called File Watchers. For each supported transpiler, IntelliJ IDEA provides a predefined File Watcher template. Predefined File Watcher templates are available at the IntelliJ IDEA level. To run a transpiler against your project files, you need to create a project-specific File Watcher based on the relevant template, at least, specify the path to the transpiler to use on your machine.
On this page:
- Installing and configuring a CoffeeScript transpiler
- Creating a File Watcher
- Previewing the transpilation results without running a transpiler
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 IntelliJ IDEA, 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).
Install and enable the NodeJS repository plugin.
The plugin is not bundled with IntelliJ IDEA, but it is available from the JetBrains plugin repository. Once enabled, the plugin is available at the IDE level, that is, you can use it in all your IntelliJ IDEA projects.
Install and enable the File Watchers repository plugin.
The plugin is not bundled with IntelliJ IDEA, but it is available from the IntelliJ IDEA plugin repository. Once enabled, the plugin is available at the IDE level, that is, you can use it in all your IntelliJ IDEA projects.
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.
npm install coffee-script
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 the transpiler have the name coffee.cmd.
For more information about installing the CoffeeScript transpiler, see https://npmjs.org/package/coffee-script.
IntelliJ IDEA 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+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, IntelliJ IDEA checks whether an applicable file watcher is available in the current project. If such file watcher is configured but disabled, IntelliJ IDEA 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, IntelliJ IDEA 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+S or Ctrl+Shift+ACtrl+SCtrl+S or Ctrl+Shift+SCtrl+SCommand SCommand SCommand S) or when you move focus from IntelliJ IDEA (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 to refresh text box of the New Watcher dialog. Based on this setting, IntelliJ IDEA detects transpiler output. However, in the Project Tree, they are shown under the source .coffee file which is now displayed as a node.
IntelliJ IDEA 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.
Language and Framework-Specific Guidelines: