This has changed lots after publication. You are better off following the official docs on Snowpack now.
Snowpack is a tool for building web applications with less tooling and 10x faster iteration. Tailwind CSS is a utility-first CSS framework for rapidly building custom designs. Let's explore how to combine both of them.
First resource we come across is on the site for Snowpack:
Tailwind works as-expected with Snowpack. Just follow the official Tailwind Install Guide. When you get to step #4 (“Process your CSS with Tailwind”) choose the official Tailwind CLI option to generate your CSS. Import that generated CSS file in your HTML application.
But this misses an important part of Process your CSS with Tailwind step on the Tailwind website:
For simple projects or just giving Tailwind a spin, you can use the Tailwind CLI tool to process your CSS.
So it's only for simpler projects or may be even trying out Tailwind.
Tailwind CLI currently does not remove unnecessary classes from Tailwind. This means that without using any of classes required for Tailwind, you would be stuck with a file of size above 1MB.
Tailwind recommends handling this by adding a PurgeCSS PostCSS Plugin.
There are several ways/plugins for PostCSS that can be used. For build tool we are using, there is even a Rollup plugin for PostCSS. But the reason we are using Snowpack is to get rid of tooling, not to add more of them. So, it would make sense to add PostCSS as it's CLI tool and also run it in production only.
First, to start of a normal snowpack project:
npm init -y
# Snowpack and a dev server of choice
npm install --save-dev snowpack servor
# Tailwind CSS. Because.
npm i tailwind
npx snowpack
You can find full guide for installing snowpack on their site
Now, for our developer tools:
# Our postcss tools
npm i --save-dev postcss-cli @fullhuman/postcss-purgecss
# ease of setting env variables and running npm scripts.
npm i cross-env npm-run-all
Setting up tailwind:
Add a src/style.css file with Tailwind necessary CSS:
@tailwind base;
@tailwind components;
@tailwind utilities;
Create tailwind.config.js by running:
npx tailwindcss init
You can edit the file to change theme or add plugins to Tailwind CSS.
Find full guide to installation on Tailwind site.
Add an HTML file to connect CSS to the HTML.
In index.html:
<!doctype html>
<html lang="en">
<head>
<title>Snowpack - Simple Example</title>
<link rel="stylesheet" type="text/css" href="/src/output.css" />
</head>
<body>
<div id="app"></div>
<script type="module" src="/src/app.js"></script>
</body>
</html>
There are two things we want to do on development:
In package.json:
{
"scripts": {
"dev": "cross-env NODE_ENV=development run-s dev:*",
"dev:server": "npx servor --reload",
"dev:css": "tailwindcss build src/style.css -o src/output.css"
}
}
This pretty much takes care of the development setup. For development, you can run:
npm run dev
Add a postcss.config.js file at root which we will be using as configuration for PostCSS:
const purgecss = require("@fullhuman/postcss-purgecss")({
content: ["./index.html", "./src/**/*.js"],
// Include any special characters you're using in this regular expression
defaultExtractor: (content) => content.match(/[\w-/:]+(?<!:)/g) || [],
});
module.exports = {
plugins: [
require("tailwindcss"),
...(process.env.NODE_ENV === "production" ? [purgecss] : []),
],
};
We are adding tailwind and purgeCSS in our PostCSS configuration and has setup PurgeCSS to run only on Production. (We are using PostCSS only on production so it's not like it's doing anything, simply following Tailwind docs on the same.)
We will run the same processes for production:
{
"scripts": {
"build": "cross-env NODE_ENV=production run-p build:*",
"build:styles": "npx postcss src/style.css -o src/output.css",
"build:module": "npx snowpack --optimize --clean"
}
}
For production, you can run:
npm run build
You will find that I'm building source and development version of CSS to the same file. This is intentional. It is possible to add a dist folder and move assets and styles and build files into the folder and fix other issues that happen with it. Feel free but remember the reason you chose Snowpack was to lighten tooling.