npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

stylus-loader

v8.1.1

Published

Stylus loader for webpack

Downloads

6,911,327

Readme

npm node tests cover discussion size

stylus-loader

A Stylus loader for webpack. Compiles Styl to CSS.

Getting Started

To begin, you'll need to install stylus and stylus-loader:

npm install stylus stylus-loader --save-dev

or

yarn add -D stylus stylus-loader

or

pnpm add -D stylus stylus-loader

Then add the loader to your webpack config. For example:

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: /\.styl$/,
        loader: "stylus-loader", // compiles Styl to CSS
      },
    ],
  },
};

And run webpack via your preferred method.

Options

stylusOptions

Type:

type stylusOptions =
  | {
      use: Array<string | Function>;
      include: Array<string>;
      import: Array<string>;
      define: Array;
      includeCSS: false;
      resolveURL: boolean | Object;
      lineNumbers: boolean;
      hoistAtrules: boolean;
      compress: boolean;
    }
  | (loaderContext: LoaderContext) => Array<string>;

Default: {}

You can pass any Stylus specific options to the stylus-loader through the stylusOptions property in the loader options. See the Stylus documentation. Options in dash-case should use camelCase.

object

Use an object to pass options through to Stylus.

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: /\.styl$/,
        use: [
          {
            loader: "style-loader",
          },
          {
            loader: "css-loader",
          },
          {
            loader: "stylus-loader",
            options: {
              stylusOptions: {
                /**
                 * Specify Stylus plugins to use. Plugins may be passed as
                 * strings instead of importing them in your Webpack config.
                 *
                 * @type {(string|Function)[]}
                 * @default []
                 */
                use: ["nib"],

                /**
                 * Add path(s) to the import lookup paths.
                 *
                 * @type {string[]}
                 * @default []
                 */
                include: [path.join(__dirname, "src/styl/config")],

                /**
                 * Import the specified Stylus files/paths.
                 *
                 * @type {string[]}
                 * @default []
                 */
                import: ["nib", path.join(__dirname, "src/styl/mixins")],

                /**
                 * Define Stylus variables or functions.
                 *
                 * @type {Array|Object}
                 * @default {}
                 */
                // Array is the recommended syntax: [key, value, raw]
                define: [
                  ["$development", process.env.NODE_ENV === "development"],
                  ["rawVar", 42, true],
                ],
                // Object is deprecated syntax (there is no possibility to specify "raw')
                // define: {
                //   $development: process.env.NODE_ENV === 'development',
                //   rawVar: 42,
                // },

                /**
                 * Include regular CSS on @import.
                 *
                 * @type {boolean}
                 * @default false
                 */
                includeCSS: false,

                /**
                 * Resolve relative url()'s inside imported files.
                 *
                 * @see https://stylus-lang.com/docs/js.html#stylusresolveroptions
                 *
                 * @type {boolean|Object}
                 * @default { nocheck: true }
                 */
                resolveURL: true,
                // resolveURL: { nocheck: true },

                /**
                 * Emits comments in the generated CSS indicating the corresponding Stylus line.
                 *
                 * @see https://stylus-lang.com/docs/executable.html
                 *
                 * @type {boolean}
                 * @default false
                 */
                lineNumbers: true,

                /**
                 * Move @import and @charset to the top.
                 *
                 * @see https://stylus-lang.com/docs/executable.html
                 *
                 * @type {boolean}
                 * @default false
                 */
                hoistAtrules: true,

                /**
                 * Compress CSS output.
                 * In the "production" mode is `true` by default
                 *
                 * @see https://stylus-lang.com/docs/executable.html
                 *
                 * @type {boolean}
                 * @default false
                 */
                compress: true,
              },
            },
          },
        ],
      },
    ],
  },
};

function

Allows setting the options passed through to Stylus based off of the loader context.

module.exports = {
  module: {
    rules: [
      {
        test: /\.styl/,
        use: [
          "style-loader",
          "css-loader",
          {
            loader: "stylus-loader",
            options: {
              stylusOptions: (loaderContext) => {
                // More information about available properties https://webpack.js.org/api/loaders/
                const { resourcePath, rootContext } = loaderContext;
                const relativePath = path.relative(rootContext, resourcePath);

                if (relativePath === "styles/foo.styl") {
                  return {
                    paths: ["absolute/path/c", "absolute/path/d"],
                  };
                }

                return {
                  paths: ["absolute/path/a", "absolute/path/b"],
                };
              },
            },
          },
        ],
      },
    ],
  },
};

sourceMap

Type:

type sourceMap = boolean;

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: /\.styl$/i,
        use: [
          "style-loader",
          {
            loader: "css-loader",
            options: {
              sourceMap: true,
            },
          },
          {
            loader: "stylus-loader",
            options: {
              sourceMap: true,
            },
          },
        ],
      },
    ],
  },
};

webpackImporter

Type:

type webpackImporter = boolean;

Default: true

Enables/Disables the default Webpack importer.

This can improve performance in some cases. Use it with caution because aliases and @import at-rules starting with ~ will not work.

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: /\.styl/i,
        use: [
          "style-loader",
          "css-loader",
          {
            loader: "stylus-loader",
            options: {
              webpackImporter: false,
            },
          },
        ],
      },
    ],
  },
};

additionalData

Type:

type additionalData =
  | string
  | (
      content: string | Buffer,
      loaderContext: LoaderContext,
      meta: any
    ) => string;

Default: undefined

Prepends Stylus code before the actual entry file. In this case, the stylus-loader will not override the source but just prepend the entry's content.

This is especially useful when some of your Stylus variables depend on the environment:

[!NOTE]

Since you're injecting code, this will break the source mappings in your entry file. Often there's a simpler solution than this, like multiple Stylus entry files.

string

module.exports = {
  module: {
    rules: [
      {
        test: /\.styl/,
        use: [
          "style-loader",
          "css-loader",
          {
            loader: "stylus-loader",
            options: {
              additionalData: `@env: ${process.env.NODE_ENV};`,
            },
          },
        ],
      },
    ],
  },
};

function

Sync
module.exports = {
  module: {
    rules: [
      {
        test: /\.styl/,
        use: [
          "style-loader",
          "css-loader",
          {
            loader: "stylus-loader",
            options: {
              additionalData: (content, loaderContext) => {
                // More information about available properties https://webpack.js.org/api/loaders/
                const { resourcePath, rootContext } = loaderContext;
                const relativePath = path.relative(rootContext, resourcePath);

                if (relativePath === "styles/foo.styl") {
                  return "value = 100px" + content;
                }

                return "value 200px" + content;
              },
            },
          },
        ],
      },
    ],
  },
};
Async
module.exports = {
  module: {
    rules: [
      {
        test: /\.styl/,
        use: [
          "style-loader",
          "css-loader",
          {
            loader: "stylus-loader",
            options: {
              additionalData: async (content, loaderContext) => {
                // More information about available properties https://webpack.js.org/api/loaders/
                const { resourcePath, rootContext } = loaderContext;
                const relativePath = path.relative(rootContext, resourcePath);

                if (relativePath === "styles/foo.styl") {
                  return "value = 100px" + content;
                }

                return "value 200px" + content;
              },
            },
          },
        ],
      },
    ],
  },
};

implementation

Type:

type implementation = Function | string;

The special implementation option determines which implementation of Stylus to use. Overrides the locally installed peerDependency version of stylus.

function

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: /\.styl/i,
        use: [
          "style-loader",
          "css-loader",
          {
            loader: "stylus-loader",
            options: {
              implementation: require("stylus"),
            },
          },
        ],
      },
    ],
  },
};

string

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: /\.styl/i,
        use: [
          "style-loader",
          "css-loader",
          {
            loader: "stylus-loader",
            options: {
              implementation: require.resolve("stylus"),
            },
          },
        ],
      },
    ],
  },
};

Examples

Normal usage

Chain the stylus-loader with the css-loader and the style-loader to immediately apply all styles to the DOM.

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: /\.styl$/,
        use: [
          {
            loader: "style-loader", // creates style nodes from JS strings
          },
          {
            loader: "css-loader", // translates CSS into CommonJS
          },
          {
            loader: "stylus-loader", // compiles Stylus to CSS
          },
        ],
      },
    ],
  },
};

Source maps

To enable sourcemaps for CSS, you'll need to pass the sourceMap property in the loader's options. If this is not passed, the loader will respect the setting for webpack source maps, set in devtool.

webpack.config.js

module.exports = {
  devtool: "source-map", // any "source-map"-like devtool is possible
  module: {
    rules: [
      {
        test: /\.styl$/,
        use: [
          "style-loader",
          {
            loader: "css-loader",
            options: {
              sourceMap: true,
            },
          },
          {
            loader: "stylus-loader",
            options: {
              sourceMap: true,
            },
          },
        ],
      },
    ],
  },
};

Using nib with stylus

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: /\.styl$/,
        use: [
          {
            loader: "style-loader", // creates style nodes from JS strings
          },
          {
            loader: "css-loader", // translates CSS into CommonJS
          },
          {
            loader: "stylus-loader", // compiles Stylus to CSS
            options: {
              stylusOptions: {
                use: [require("nib")()],
                import: ["nib"],
              },
            },
          },
        ],
      },
    ],
  },
};

Import JSON files

Stylus does not provide resolving capabilities in the json function. Therefore webpack resolver does not work for .json files. Use stylus resolver.

index.styl

// Suppose the file is located here `node_modules/vars/vars.json`
json('vars.json')

@media queries-small
  body
    display nope

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: /\.styl$/,
        use: [
          "style-loader",
          "css-loader",
          {
            loader: "stylus-loader",
            options: {
              stylusOptions: {
                // Specify the path. where to find files
                paths: ["node_modules/vars"],
              },
            },
          },
        ],
      },
    ],
  },
};

In production

Usually, it's recommended to extract the style sheets into a dedicated file in production using the MiniCssExtractPlugin. This way your styles are not dependent on JavaScript.

webpack resolver

Webpack provides an advanced mechanism to resolve files. The stylus-loader applies the webpack resolver when processing queries. Thus you can import your Stylus modules from node_modules.

@import 'bootstrap-styl/bootstrap/index.styl';

Using ~ is deprecated and can be removed from your code (we recommend it), but we still support it for historical reasons. Why you can removed it? The loader will first try to resolve @import/@require as relative, if it cannot be resolved, the loader will try to resolve @import/@require inside node_modules. Just prepend them with a ~ which tells webpack to look up the modules.

@import "~bootstrap-styl/bootstrap/index.styl";

It's important to only prepend it with ~, because ~/ resolves to the home-directory. Webpack needs to distinguish between bootstrap and ~bootstrap, because CSS and Styl files have no special syntax for importing relative files. Writing @import "file" is the same as @import "./file";

Stylus resolver

If you specify the paths option, modules will be searched in the given paths. This is Stylus default behavior.

webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: /\.styl/,
        use: [
          {
            loader: "style-loader",
          },
          {
            loader: "css-loader",
          },
          {
            loader: "stylus-loader",
            options: {
              stylusOptions: {
                paths: [path.resolve(__dirname, "node_modules")],
              },
            },
          },
        ],
      },
    ],
  },
};

Extracting style sheets

Bundling CSS with webpack has some nice advantages like referencing images and fonts with hashed urls or hot module replacement in development. In production, on the other hand, it's not a good idea to apply your style sheets depending on JS execution. Rendering may be delayed or even a FOUC might be visible. Thus it's often still better to have them as separate files in your final production build.

There are two possibilities to extract a style sheet from the bundle:

Contributing

Please take a moment to read our contributing guidelines if you haven't yet done so.

CONTRIBUTING

License

MIT