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.
- 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.
- 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+InsertCommand N; Command Enter.
Depending on the tool you are going to use, choose the appropriate predefined template from the pop-up list:
In the Program text box, specify the path to the compiler executable file or archive depending on the chosen predefined template.
- lessc.cmd for LESS If you installed the tool through the Node Package Manager, WebStorm locates the required file itself at <node.js_home>/node_modules/bin/lessc.cmd and fills in the field automatically. Otherwise, type the path manually or click the Browse button and choose the file location in the dialog box that opens.
- sass.bat for SASS
- scss.bat for SCSS
If you installed the SASS and SCSS tools through Ruby, WebStorm locates the required files itself at <ruby_home>/bin/sass.bat <ruby_home>/bin/scss.bat respectively and fills in the field automatically. Otherwise, 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 code
When you open a TypeScript 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 ( , ) or when you move focus from WebStorm (upon frame deactivation).
WebStorm creates a separate file with the generated output. The file has the name of the source SASS, LESS, or SCSS file and the extension css. The location of the generated files is defined in the Output Paths text box of the New Watcher dialog. However, in the Project Tree, they are shown under the source file which is now displayed as a node.