How to Remove unused CSS with PurgeCSS

We can tackle web performance in different ways, and one of them is removing all JS and CSS we don't use in our apps.

In the case of CSS, it's even more important when we use frameworks such as Bootstrap, Bulma or Tailwind, as well as when we're facing large or legacy applications.

PurgeCSS is a tool that removes unused CSS by applying string comparison. That has some advantages, but also some caveats, so please keep attention to the white-listing part later.

PurgeCSS configuration can be different in each project. It can be set as a webpack plugin or a postcss plugin.

In the case of VueDose, I'm using it as a postcss plugin. So I have a postcss.config.js file with this content:

const purgecss = require("@fullhuman/postcss-purgecss");

const plugins = [...];

if (process.env.NODE_ENV === "production") {
      content: [
      whitelist: ["html", "body"],
      whitelistPatternsChildren: [/^token/, /^pre/, /^code/],

module.exports = { plugins };

Basically, all you need is to tell where to look for the matching classes using the content property.

Also, you'd like to whitelist some classes or tags to don't be removed. You'll need to do that at least in html and body, as well as any dynamic classes.


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How to Remove unused CSS with PurgeCSS

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