PostCSS Prefix Wrap

✅ Supports PostCSS v7 or v8

A PostCSS plugin which prepends a selector to CSS styles to constrain their effect on parent elements in a page.

• How to use this plugin?
• What options does it have?
• How to contribute?
• Is this project secure?
• How is the project structured?
• License

How to use this plugin?

These instructions are only for this plugin. See the PostCSS website for framework information.

Install

Using Yarn

yarn add postcss-prefixwrap --dev --exact

Using NPM

npm install postcss-prefixwrap --save-dev --save-exact

Configure

Add to your PostCSS configuration.

With Gulp

const Gulp = require("gulp");
const PostCSS = require("gulp-postcss");
const PrefixWrap = require("postcss-prefixwrap");

Gulp.task("css", () =>
    Gulp.src("./src/*.css")
        .pipe(PostCSS([PrefixWrap(".my-custom-wrap")]))
        .pipe(Gulp.dest("./dest"))
);

With WebPack

const PrefixWrap = require("postcss-prefixwrap");

module.exports = {
    module: {
        rules: [
            {
                test: /\.css$/,
                use: [
                    "style-loader",
                    { loader: "css-loader", options: { importLoaders: 1 } },
                    {
                        loader: "postcss-loader",
                        options: {
                            plugins: [PrefixWrap(".my-custom-wrap")],
                        },
                    },
                ],
            },
        ],
    },
};

Based on example from https://webpack.js.org/loaders/postcss-loader/.

Container

Add the container to your markup.

<div class="my-custom-wrap"><!-- Your existing markup. --></div>

View

View your CSS, now prefix-wrapped.

Before

p {
    color: red;
}

body {
    font-size: 16px;
}

After

.my-custom-wrap p {
    color: red;
}

.my-custom-wrap {
    font-size: 16px;
}

What options does it have?

• Minimal
• Ignored Selectors
• Prefix Root Tags
• File Whitelist
• File Blacklist

Minimal

The minimal required configuration is the prefix selector, as shown in the above example.

PrefixWrap(".my-custom-wrap");

Ignored Selectors

You may want to exclude some selectors from being prefixed, this is enabled using the ignoredSelectors option.

PrefixWrap(".my-custom-wrap", {
    ignoredSelectors: [":root", "#my-id", /^\.some-(.+)$/],
});

Prefix Root Tags

You may want root tags, like body and html to be converted to classes, then prefixed, this is enabled using the prefixRootTags option.

PrefixWrap(".my-container", {
    prefixRootTags: true,
});

With this option, a selector like html will be converted to .my-container .html, rather than the default .my-container.

File Whitelist

In certain scenarios, you may only want PrefixWrap() to wrap certain CSS files. This is done using the whitelist option.

PrefixWrap(".my-custom-wrap", {
    whitelist: ["editor.css"],
});

File Blacklist

In certain scenarios, you may want PrefixWrap() to exclude certain CSS files. This is done using the blacklist option.

If whitelist option is also included, blacklist will be ignored.

PrefixWrap(".my-custom-wrap", {
    blacklist: ["colours.css"],
});

How to contribute?

Read our Contributing Guide to learn more about how to contribute to this project.

Is this project secure?

Read our Security Guide to learn how security is considered during the development and operation of this plugin.

How is the project structured?

Read our Architecture Document to learn how this project is structured.

License

The MIT License is used by this project.