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tailwind-example

All the examples I found just after Tailwind 2.0s release cover getting Tailwind 1.x into an Ember app. The setup is just slightly different, enough to give some weird errors. For someone not very familiar with PostCSS it was confusing. I put this example repository together to figure out a minimal working example. Hope it helps someone else.

Step 1 - Installing Dependencies

If you are already using ember-cli-postcss make sure to update to latest v7 version. Tailwind 2.x switches to PostCSS v8. See the ember-cli-postcss README for specifics of ther version: (https://github.com/jeffjewiss/ember-cli-postcss)

ember install ember-cli-postcss
npm install --save-dev tailwindcss autoprefixer

Step 2 - Create a tailwind config file

npx tailwindcss init config/tailwindcss-config.js --full

Step 3 - Configure ember-cli-build.js

This is the part that's a big different. The configuration used to take an array of modules, and the tailwind plugin was passed the location of the config by calling the module.

With tailwind 2.0, ember-cli-postcss v7, and PostCSS v8 the configuration excepts an array of objects each containing a module and an options property.

/* ember-cli-build.js */

'use strict';

const EmberApp = require('ember-cli/lib/broccoli/ember-app');
const autoprefixer = require('autoprefixer');
const tailwind = require('tailwindcss');

module.exports = function(defaults) {
  let app = new EmberApp(defaults, {
    postcssOptions: {
      compile: {
        plugins: [
          {
            module: autoprefixer,
            options: {}
          },
          {
            module: tailwind,
            options: {
              config: './config/tailwindcss-config.js'
            }
          }
        ],
      }
    }
  });

  return app.toTree();
};

Step 4 - Import Tailwind in app.css

// app/stytles/app.css
@tailwind base;
@tailwind components;
@tailwind utilities;

Step 5 - Replace application.hbs with tailwind css

{{!-- app/templates/application.hbs --}}
<div class="container mx-auto">
  <h1 class="font-mono text-blue-500">Hello Tailwind</h1>
</div>

Step 6 (Optional) - Modify tailwind config to purge unused css

Thanks to @kamal on twitter who pointed out that Tailwind now ships with a purge option. Make the following changes to the tailwindcss-config.js to scan the index.html and hbs template files for css classes. This will greatly reduce the size of the css shipped to the browser. In this sample app the css file went from 2.73MB in development to 2.75 KB when purged.

See (https://tailwindcss.com/docs/optimizing-for-production) for more information about the purge option. Note that tailwind will only purge when NODE_ENV=production. ember-cli doesn't set the NODE_ENV to production by default, to get a purged build I ran the following command:

NODE_ENV=production ember build --prod

/* config/tailwindcss-config.js */
 const colors = require('tailwindcss/colors')
 
 module.exports = {
-  purge: [],
+  purge: [
+    './app/**/*.html',
+    './app/**/*.hbs',
+  ],
   presets: [],
   darkMode: false, // or 'media' or 'class'
   theme: {

TODO

Modifying the tailwindcss-config.js doesn't regenerate the css, which is kinda a pain when trying to tweak your config. You need to stop / start ember s to pickup the changes. If anyone knows how to resolve that please open a PR :)

Thanks

Thanks to the awesome develepors that build all the tools that make this all possible.