Phoenix with esbuild, fortawesome, and tailwindcss

README.md

Using fortawesome (font-awesome) and TailwindCSS (JIT mode) with Phoenix 1.6 and esbuild

Setup

1. Navigate to the assets dir cd assets/
2. Install fortawesome, esbuild esbuild-sass-plugins, chokidar (used for watching), tailwind, postcss, and the phoenix deps npm install --save-dev fs path chokidar esbuild esbuild-sass-plugin postcss autoprefixer tailwindcss @fortawesome/fontawesome-free ../deps/phoenix ../deps/phoenix_html ../deps/phoenix_live_view
3. Create a build.js file with the contents of the build.js file in this gist (I prefer to put this inside of a scripts directory inside of assets. If you leave it at the root, you will need to update the build.js file relative paths)
4. Create the tailwind.config.js in assets root with the contents of the tailwind.config.js file in this gist
5. Rename app.css to app.scss
6. At the top of the app.scss file, add the following (also in this gist as app.scss)

$fa-font-path: "@fortawesome/fontawesome-free/webfonts/";
@import "@fortawesome/fontawesome-free/scss/fontawesome";
@import "@fortawesome/fontawesome-free/scss/regular";
@import "@fortawesome/fontawesome-free/scss/solid";
@import "@fortawesome/fontawesome-free/scss/brands";
@import "@fortawesome/fontawesome-free/scss/v4-shims";
@import "tailwindcss/base";
@import "tailwindcss/components";
@import "tailwindcss/utilities";

6. Update the phoenix configs to use the script file instead of esbuild cli. config/config.exs

config :esbuild,
  version: "0.12.18",
  node: [
    "build.js",
    cd: Path.expand("../assets/scripts/", __DIR__),
    env: %{"ESBUILD_LOG_LEVEL" => "silent", "ESBUILD_WATCH" => "1", "NODE_ENV" => "development"}
  ]

config/dev.exs

watchers: [
    node: [
      "build.js",
      cd: Path.expand("../assets/scripts/", __DIR__),
      env: %{"ESBUILD_LOG_LEVEL" => "silent", "ESBUILD_WATCH" => "1", "NODE_ENV" => "development"}
    ]

mix.exs

defp aliases do
    [
      setup: ["deps.get"],
      "assets.deploy": [
        "cmd --cd assets NODE_ENV=production node scripts/build.js",
        "phx.digest"
      ]
    ]
  end

7. Update assets/js/app.js for the new scss file extension import ../css/app.scss
8. Use the icons in your html <i class="fas fa-{ICON}></i>
9. Use tailwind in your eex/leex/heex/html templates or inside of css:

<main class="container">content</main>
<button class="bg-blue-500 hover:bg-blue-700 text-white font-bold py-2 px-4 rounded">
  Button
</button>

main {
  @apply container;
}

.btn-blue {
  @apply bg-blue-500 hover:bg-blue-700 text-white font-bold py-2 px-4 rounded;
}

app.scss

$fa-font-path: "@fortawesome/fontawesome-free/webfonts/";
@import "@fortawesome/fontawesome-free/scss/fontawesome";
@import "@fortawesome/fontawesome-free/scss/regular";
@import "@fortawesome/fontawesome-free/scss/solid";
@import "@fortawesome/fontawesome-free/scss/brands";
@import "@fortawesome/fontawesome-free/scss/v4-shims";
@import "tailwindcss/base";
@import "tailwindcss/components";
@import "tailwindcss/utilities";

build.js

const fs = require('fs');
const path = require('path');
const { watch } = require('chokidar');
const { sassPlugin } = require("esbuild-sass-plugin");
const postcss = require('postcss');
const autoprefixer = require('autoprefixer');
const tailwindcss = require('tailwindcss');


// config
const ENTRY_FILE = 'app.js';
const OUTPUT_DIR = path.resolve(__dirname, '../../priv/static/assets');
const OUTPUT_FILE = 'app.js';
const MODE = process.env['NODE_ENV'] || 'production';
const TARGET = 'es2016'

// build
function build(entryFile, outFile) {
	console.log(`[+] Starting static assets build with esbuild. Build mode ${MODE}...`)
	require('esbuild').build({
		entryPoints: [entryFile],
		outfile: outFile,
		minify: MODE === 'dev' || MODE === 'development' ? false : true, // if dev mode, don't minify
		watch: false,
		bundle: true,
		target: TARGET,
		logLevel: 'silent',
		loader: { // built-in loaders: js, jsx, ts, tsx, css, json, text, base64, dataurl, file, binary
			'.ttf': 'file',
			'.otf': 'file',
			'.svg': 'file',
			'.eot': 'file',
			'.woff': 'file',
			'.woff2': 'file'
		},
		plugins: [
			sassPlugin({
				async transform(source, resolveDir) {
					const { css } = await postcss(
						autoprefixer,
						tailwindcss(path.resolve(__dirname, "../tailwind.config.js"))
					).process(source)
					return css
				}
			})
		], // optional
		define: {
			'process.env.NODE_ENV': MODE === 'dev' || MODE === 'development' ? '"development"' : '"production"',
			'global': 'window'
		},
		sourcemap: MODE === 'dev' || MODE === 'development' ? true : false

	})
		.then(() => { console.log(`[+] Esbuild ${entryFile} to ${outFile} succeeded.`) })
		.catch((e) => {
			console.log('[-] Error building:', e.message);
			process.exit(1)
		})
}



// helpers
function mkDirSync(dir) {
	if (fs.existsSync(dir)) {
		return;
	}

	try {
		fs.mkdirSync(dir);
	} catch (err) {
		if (err.code === 'ENOENT') {
			mkDirSync(path.dirname(dir))
			mkDirSync(dir)
		}
	}
}

// make sure build directory exists
mkDirSync(OUTPUT_DIR);

// build initial
build(path.join(__dirname, '..', "js", ENTRY_FILE), `${OUTPUT_DIR}/${OUTPUT_FILE}`)
// watcher
if (MODE === 'dev' || MODE === 'development') {
	const watcher = watch(['../../lib/**/*.*eex*', '../js/*.js*', '../css/*.*css*']);
	watcher.on('change', () => {
		build(path.join(__dirname, '..', "js", ENTRY_FILE), `${OUTPUT_DIR}/${OUTPUT_FILE}`);
	})
}

Phoenix esbuild with Tailwind and Fontawesome

Phoenix esbuild with Tailwind+Fontawesome

tailwind.config.js

module.exports = {
	mode: 'jit',
	purge: [
		'../../lib/**/*.ex',
		'../../lib/**/*.leex',
		'../../lib/**/*.heex',
		'../../lib/**/*.lexs',
		'../../lib/**/*.exs',
		'../../lib/**/*.eex',
		'../js/**/*.js'
	],
	theme: {
		extend: {},
	},
	variants: {
		extend: {},
	},
	plugins: [],
};

It shouldn't make much of a difference but for the sake of cleanness and following the official documentation:
change

npm install --save-dev fs path chokidar esbuild esbuild-sass-plugin postcss autoprefixer tailwindcss @fortawesome/fontawesome-free ../deps/phoenix ../deps/phoenix_html ../deps/phoenix_live_view

to

npm install --save-dev fs path chokidar esbuild esbuild-sass-plugin postcss autoprefixer tailwindcss @fortawesome/fontawesome-free
npm install --save ../deps/phoenix ../deps/phoenix_html ../deps/phoenix_live_view

and

const ENTRY_FILE = 'app.js';
const OUTPUT_DIR = path.resolve(__dirname, '../../priv/static/assets');
const OUTPUT_FILE = 'app.js';
+const ENTRY_CSS_FILE = 'app.scss';
+const OUTPUT_CSS_FILE = 'app.scss';

...
build(path.join(__dirname, '..', "js", ENTRY_FILE), `${OUTPUT_DIR}/${OUTPUT_FILE}`);
+ build(path.join(__dirname, '..', "css", ENTRY_CSS_FILE), `${OUTPUT_DIR}/${OUTPUT_CSS_FILE}`)

to update the assets folder with the builded css

@hammsvietro I didn't notice any difference after adding this change - the css/app.scss is still built because of it's imported in the app.js.

Can you please eplain why is this needed?