Usage

The plugin will generate optimized class name. Configure minimally as follows:

postcss.config.js

import postCSSMangleCSSClass from "postcss-mangle-css-class";

export default {
  plugins: [
    postCSSMangleCSSClass({
      CSSinput: "./style.css",
      export: {
        JSONFile: "./.mangle-css-class/classes.json",
        JSFile: "./.mangle-css-class/classes.js"
      },
      classNameRename: "[name]_[hash]",
      getOutput(renamed, excluded) {
        console.log("output", { renamed, excluded });
      },
    }),
  ],
};

Options

const options = {
    enable: true,
    cwd: process.cwd(), 
    CSSinput: "",
    classNameRename: "[name]_[hash]", 
    hash: {
      type: "random",
      minLength: 5,
      salt: "",
    },
    exclude: {
      classNames: [],
      files: [],
    },
    CSSextensions: [".css", ".sass", ".scss", ".less", ".styl"],
    export: {
      JSONFile: "./.mangle-css-class/classes.json", JSFile: "./.mangle-css-class/classes.js",
      rewrite: false,
    },
    getOutput(renamed, excluded) {}
  };

enable Boolean

Enable/disable plugin. Default: true

cwd String

The current working directory. Default: process.cwd()

CSSinput String, String[]

Establishes which CSS files should be analyzed. e.g: './app.css'

classNameRename String

Set an interpolated string to rename CSS classes. Placeholders compatible:

• [name] is the class name
• [hash] is the hash generate. You can set the type to hash.type and the minimum length hash.minLength and optionally hash.salt

e.g.: prefix_[name]_[hash]

hash.type String

Sets the hash type. Possible values: none,random,salt. Default: random

• none no hash will be applied.
• random generates an unpredictable random hash.
• salt generates a predictable random hash. If you need it to be unique; for example, in each project, you can configure: hash.salt

hash.minLength Int

Set the minimum hash length. Default: 5

hash.salt String

If you need to generate unique hashes for each project, you can set salt different in each one. e.g: myProject1. It is only applicable if you have defined hash.type:salt

exclude.classNames String, Regex, String[], Regex[]

CSS classes that will not be replaced. e.g: ["card",/text-/g]

exclude.files String, Glob, String[], Glob[]

CSS classes that are used or found in these files will be ignored. e.g: ["./css-ignore.css","./js/*.js"]

CSSextensions String, String[]

Establishes which files should be parsed as style sheets. Usually used if you set exclude.files. Default: [".css", ".sass", ".scss", ".less", ".styl"]

export.JSONFile String, Boolean

The path of the file where the replaced classes will be saved. Default: "./.mangle-css-class/classes.json". The file will have the following structure:

{
  "card":"ahJ25g",
  "card-body":"Awk1JO"
}

export.JSFile String, Boolean

The path of the file where the replaced classes will be saved in format ESM. Default: "./.mangle-css-class/classes.js". The file will have the following structure:

const card = "ahJ25g";
const card_body = "Awk1JO";
export default {card,card_body}

export.rewrite Boolean

Sets whether to rewrite previously generated files. Default: false.

getOutput(renamed, excluded) Function

A callback that passes the renamed and excluded CSS classes.

Utilities/Methods

init

Required to start; It should commonly be called before any script.

const options_ = {
  cwd: process.cwd(),
  CSSinput: "",
  postcss: null,
  context: {},
};

• cwd the current working directory. Default process.cwd()
• CSSinput CSS files that are allowed to be analyzed. e.g: './app.css'
• postcss PostCSS config. Default: load postcss.config.js in the root project

e.g:

import initMangleCSSClass from "postcss-mangle-css-class/init";

initMangleCSSClass({
  CSSinput: "./style.css"
});

Examples

Each package has its own particularity, which is why we have prepared the following examples of how you could use this plugin. For more details:

If you are using vite ...

You can use the plugin vite-plugin-replace-mangle-css-class Documentation

• Vite HTML Alpinejs

Others ...

• Nextjs
• Nuxtjs

Recommendations

• Use a single main style sheet as input. e.g:

Before:

// postcss.config.js
import postCSSMangleCSSClass from "postcss-mangle-css-class";

export default {
  plugins: [
    postCSSMangleCSSClass({
      CSSinput: ["./page-1.css","./page-2.css","./page-3.css"]
    }),
  ],
};

After:

// postcss.config.js
import postCSSMangleCSSClass from "postcss-mangle-css-class";

export default {
  plugins: [
    postCSSMangleCSSClass({
      CSSinput: "./all-pages.css"
    }),
  ],
};

MIT License

This project is under license from MIT. For more details, see the LICENSE file.