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Install PurgeTSS globally on your machine using NPM.

> [sudo] npm i -g purgetss
Max Node version

PurgeTSS is only compatible with Node.js versions up to 16.x

Running PurgeTSS for the first time


You will only need to run purgetss once inside your project to automatically generate the necessary files and folders.

Subsequently, each time you build your application, PurgeTSS will parse all your XML files and output a clean app.tss file with only the classes used in your project.

When you run purgetss for the first time in your project, it will do the following tasks:

1. Auto-Run Hook

PurgeTSS will add a task in alloy.jmk to auto-run purgetss every time you compile your app. This is useful when using liveview.

2. purgetss folder

PurgeTSS will create a purgetss folder at the root of your project with the following files and folder:

  • config.js file

    This is where you can customize or create new classes with your own spacing, colors, margin values, and more. See the Customization Section for more details.

  • tailwind.tss file

    This file contains all Tailwind-like utility classes, including all your custom classes defined in config.js.

  • definitions.css file

    This is a special css file that includes ALL the classes from tailwind.tss, _app.tss, any .tss left in your project, and fonts.tss files, including all the classes from the official icon fonts libraries to be used with the “Intellisencse for CSS class names in HTML” VS Code extension

  • fonts folder

    This is where you can add any Icon, Serif, Sans-Serif, Cursive, Fantasy, or Monospace fonts to be used in your app. See the build-fonts command for step-by-step instructions.


PurgeTSS will OVERWRITE your existing app.tss file

When you run PurgeTSS for the first time, it will back up your app.tss file to _app.tss.

From this point on, you can add, delete, or update your custom classes in _app.tss.

Or, even better, you can add your custom values in config.js. See the Configuration Section for more information

Example files

To use the example files:

  • Copy the content of index.xml and app.tss into a new Alloy project.
  • Install Font Awesome font files with purgetss copy-fonts --vendor=fontawesome.
  • Run purgetss once to generate the necessary files.
  • Compile your app as usual.
  • We recommend using liveview to speed up testing and development time.
<Window class="bg-primary">
<View class="w-10/12 h-auto bg-white rounded-lg">
<View class="m-4 vertical">
<ImageView class="w-16 h-16 mx-auto rounded-16" image="" />

<View class="vertical">
<Label class="text-lg font-semibold text-center text-gray-900">John W. Doe</Label>
<Label class="text-sm text-center text-purple-600 mt-0.5">Product Engineer</Label>

<View class="w-screen mt-6">
<View class="ml-0 horizontal">
<Label class="mr-1 text-xs text-gray-600 far fa-envelope"></Label>
<Label class="text-xs text-gray-600"></Label>

<View class="mr-0 horizontal">
<Label class="mr-1 text-xs text-gray-600 fas fa-phone-alt"></Label>
<Label class="text-xs text-gray-600">(555) 765-4321</Label>
'.bg-primary': {
backgroundColor: '#002359'

After running purgetss, you will have a new app.tss file with only the classes used in the XML files.

Your original app.tss file is backed up in _app.tss. You can use this file to add, delete, or update any of your original styles.

Every time purgetss runs, it will copy the content of _app.tss to app.tss.

app.tss after purging
// PurgeTSS v6.2.0
// Created by César Estrada

// _app.tss styles
'.bg-primary': {
backgroundColor: '#002359'

// Ti Elements
'ImageView[platform=ios]': { hires: true }
'View': { width: Ti.UI.SIZE, height: Ti.UI.SIZE }
'Window': { backgroundColor: '#ffffff' }

// Main Styles
'.bg-white': { backgroundColor: '#ffffff' }
'.font-semibold': { font: { fontWeight: 'semibold' } }
'.h-16': { height: 64 }
'.h-auto': { height: Ti.UI.SIZE }
'.horizontal': { layout: 'horizontal' }
'.m-4': { top: 16, right: 16, bottom: 16, left: 16 }
'.ml-0': { left: 0 }
'.mr-0': { right: 0 }
'.mr-1': { right: 4 }
'.mt-0.5': { top: 2 }
'.mt-6': { top: 24 }
'.mx-auto': { right: null, left: null }
'.rounded-16': { borderRadius: 32 }
'.rounded-lg': { borderRadius: 8 }
'.text-center': { textAlign: Ti.UI.TEXT_ALIGNMENT_CENTER }
'.text-gray-600': { color: '#4b5563', textColor: '#4b5563' }
'.text-gray-900': { color: '#111827', textColor: '#111827' }
'.text-lg': { font: { fontSize: 18 } }
'.text-purple-600': { color: '#9333ea', textColor: '#9333ea' }
'.text-sm': { font: { fontSize: 14 } }
'.text-xs': { font: { fontSize: 12 } }
'.vertical': { layout: 'vertical' }
'.w-10/12': { width: '83.333334%' }
'.w-16': { width: 64 }
'.w-screen': { width: Ti.UI.FILL }

// Default Font Awesome
'.fa-envelope': { text: '\uf0e0', title: '\uf0e0' }
'.fa-phone-alt': { text: '\uf879', title: '\uf879' }
'.far': { font: { fontFamily: 'FontAwesome6Free-Regular' } }
'.fas': { font: { fontFamily: 'FontAwesome6Free-Solid' } }

iOS Screen - Example

More examples in the Tailwind TSS Sample App

VSCode extension

If you're using Visual Studio Code, we recommend installing the IntelliSense for CSS class names in HTML extension.

It provides class name completion for the XML class attribute based on the definitions.css file created by PurgeTSS.

Class Completion using IntelliSense for CSS class names in HTML

After installing the extension, you'll need to add the xml language to the "HTMLLanguages" setting and exclude any css/html files from the caching process by pointing "excludeGlobPattern" to the ./purgetss/fonts/ folder.

VS Code ‘settings.json’ file
"html-css-class-completion.HTMLLanguages": [
"html-css-class-completion.excludeGlobPattern": "**/node_modules/**,purgetss/fonts/**/*.{css,html}",