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# stylus-loader
A Stylus loader for webpack. Compiles Styl to CSS.
## Getting Started
To begin, you'll need to install `stylus` and `stylus-loader`:
```console
$ npm install stylus stylus-loader --save-dev
```
Then add the loader to your `webpack` config. For example:
**webpack.config.js**
```js
module.exports = {
module: {
rules: [
{
test: /\.styl$/,
loader: "stylus-loader", // compiles Styl to CSS
},
],
},
};
```
And run `webpack` via your preferred method.
## Options
| Name | Type | Default | Description |
| :---------------------------------------: | :------------------: | :----------------: | :------------------------------------------------------- |
| **[`stylusOptions`](#stylusOptions)** | `{Object\|Function}` | `{}` | Options for Stylus. |
| **[`sourceMap`](#sourcemap)** | `{Boolean}` | `compiler.devtool` | Enables/Disables generation of source maps. |
| **[`webpackImporter`](#webpackimporter)** | `{Boolean}` | `true` | Enables/Disables the default Webpack importer. |
| **[`additionalData`](#additionalData)** | `{String\|Function}` | `undefined` | Prepends/Appends `Stylus` code to the actual entry file. |
| **[`implementation`](#implementation)** | `{String\|Function}` | `stylus` | Setup Stylus implementation to use. |
### `stylusOptions`
Type: `Object|Function`
Default: `{}`
You can pass any Stylus specific options to the `stylus-loader` through the `stylusOptions` property in the [loader options](https://webpack.js.org/configuration/module/#rule-options-rule-query).
See the [Stylus documentation](https://stylus-lang.com/docs/js.html).
Options in dash-case should use camelCase.
#### `Object`
Use an object to pass options through to Stylus.
**webpack.config.js**
```js
module.exports = {
module: {
rules: [
{
test: /\.styl$/,
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: {
// $development: process.env.NODE_ENV === 'development',
// rawVar: 42,
// },
/**
* Include regular CSS on @import.
*
* @type {boolean}
* @default false
*/
includeCSS: false,
/**
* Resolve relative url()'s inside imported files.
*
* @see https://stylus-lang.com/docs/js.html#stylusresolveroptions
*
* @type {boolean|Object}
* @default { nocheck: true }
*/
resolveURL: true,
// resolveURL: { nocheck: true },
/**
* Emits comments in the generated CSS indicating the corresponding Stylus line.
*
* @see https://stylus-lang.com/docs/executable.html
*
* @type {boolean}
* @default false
*/
lineNumbers: true,
/**
* Move @import and @charset to the top.
*
* @see https://stylus-lang.com/docs/executable.html
*
* @type {boolean}
* @default false
*/
hoistAtrules: true,
/**
* Compress CSS output.
* In the "production" mode is `true` by default
*
* @see https://stylus-lang.com/docs/executable.html
*
* @type {boolean}
* @default false
*/
compress: true,
},
},
},
],
},
],
},
};
```
#### `Function`
Allows setting the options passed through to Stylus based off of the loader context.
```js
module.exports = {
module: {
rules: [
{
test: /\.styl/,
use: [
"style-loader",
"css-loader",
{
loader: "stylus-loader",
options: {
stylusOptions: (loaderContext) => {
// More information about available properties https://webpack.js.org/api/loaders/
const { resourcePath, rootContext } = loaderContext;
const relativePath = path.relative(rootContext, resourcePath);
if (relativePath === "styles/foo.styl") {
return {
paths: ["absolute/path/c", "absolute/path/d"],
};
}
return {
paths: ["absolute/path/a", "absolute/path/b"],
};
},
},
},
],
},
],
},
};
```
### `sourceMap`
Type: `Boolean`
**webpack.config.js**
```js
module.exports = {
module: {
rules: [
{
test: /\.styl$/i,
use: [
"style-loader",
{
loader: "css-loader",
options: {
sourceMap: true,
},
},
{
loader: "stylus-loader",
options: {
sourceMap: true,
},
},
],
},
],
},
};
```
### `webpackImporter`
Type: `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**
```js
module.exports = {
module: {
rules: [
{
test: /\.styl/i,
use: [
"style-loader",
"css-loader",
{
loader: "stylus-loader",
options: {
webpackImporter: false,
},
},
],
},
],
},
};
```
### `additionalData`
Type: `String|Function`
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:
> ℹ 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`
```js
module.exports = {
module: {
rules: [
{
test: /\.styl/,
use: [
"style-loader",
"css-loader",
{
loader: "stylus-loader",
options: {
additionalData: `@env: ${process.env.NODE_ENV};`,
},
},
],
},
],
},
};
```
#### `Function`
##### Sync
```js
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
```js
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: `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**
```js
module.exports = {
module: {
rules: [
{
test: /\.styl/i,
use: [
"style-loader",
"css-loader",
{
loader: "stylus-loader",
options: {
implementation: require("stylus"),
},
},
],
},
],
},
};
```
#### String
**webpack.config.js**
```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`](https://github.com/webpack-contrib/css-loader) and the [`style-loader`](https://github.com/webpack-contrib/style-loader) to immediately apply all styles to the DOM.
**webpack.config.js**
```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**
```javascript
module.exports = {
devtool: "source-map", // any "source-map"-like devtool is possible
module: {
rules: [
{
test: /\.styl$/,
use: [
"style-loader",
{
loader: "css-loader",
options: {
sourceMap: true,
},
},
{
loader: "stylus-loader",
options: {
sourceMap: true,
},
},
],
},
],
},
};
```
### Using nib with stylus
**webpack.config.js**
```js
module.exports = {
module: {
rules: [
{
test: /\.styl$/,
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`](#stylus-resolver).
**index.styl**
```styl
// Suppose the file is located here `node_modules/vars/vars.json`
json('vars.json')
@media queries-small
body
display nope
```
**webpack.config.js**
```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](https://github.com/webpack-contrib/mini-css-extract-plugin). This way your styles are not dependent on JavaScript.
### webpack resolver
Webpack provides an [advanced mechanism to resolve files](https://webpack.js.org/configuration/resolve/).
The `stylus-loader` applies the webpack resolver when processing queries.
Thus you can import your Stylus modules from `node_modules`.
```styl
@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`](https://webpack.js.org/configuration/resolve/#resolve-modules).
Just prepend them with a `~` which tells webpack to look up the [`modules`](https://webpack.js.org/configuration/resolve/#resolve-modules).
```styl
@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**
```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](https://webpack.js.org/concepts/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](https://en.wikipedia.org/wiki/Flash_of_unstyled_content) 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:
- [`extract-loader`](https://github.com/peerigon/extract-loader) (simpler, but specialized on the css-loader's output)
- [MiniCssExtractPlugin](https://github.com/webpack-contrib/mini-css-extract-plugin) (more complex, but works in all use-cases)
## Contributing
Please take a moment to read our contributing guidelines if you haven't yet done so.
[CONTRIBUTING](./.github/CONTRIBUTING.md)
## License
[MIT](./LICENSE)
[npm]: https://img.shields.io/npm/v/stylus-loader.svg
[npm-url]: https://npmjs.com/package/stylus-loader
[node]: https://img.shields.io/node/v/stylus-loader.svg
[node-url]: https://nodejs.org
[deps]: https://david-dm.org/webpack-contrib/stylus-loader.svg
[deps-url]: https://david-dm.org/webpack-contrib/stylus-loader
[tests]: https://github.com/webpack-contrib/stylus-loader/workflows/stylus-loader/badge.svg
[tests-url]: https://github.com/webpack-contrib/stylus-loader/actions
[cover]: https://codecov.io/gh/webpack-contrib/stylus-loader/branch/master/graph/badge.svg
[cover-url]: https://codecov.io/gh/webpack-contrib/stylus-loader
[chat]: https://img.shields.io/badge/gitter-webpack%2Fwebpack-brightgreen.svg
[chat-url]: https://gitter.im/webpack/webpack
[size]: https://packagephobia.now.sh/badge?p=stylus-loader
[size-url]: https://packagephobia.now.sh/result?p=stylus-loader