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Load Config

Install

npm i -D postcss-load-config

Usage

npm i -S|-D postcss-plugin

Install all required postcss plugins and save them to your package.json dependencies/devDependencies

Then create a postcss config file by choosing one of the following formats

`package.json`

Create a postcss section in your project's package.json

Project (Root)
  |– client
  |– public
  |
  |- package.json

{
  "postcss": {
    "parser": "sugarss",
    "map": false,
    "plugins": {
      "postcss-plugin": {}
    }
  }
}

`.postcssrc`

Create a .postcssrc file in JSON or YAML format

ℹ️ It's recommended to use an extension (e.g .postcssrc.json or .postcssrc.yml) instead of .postcssrc

Project (Root)
  |– client
  |– public
  |
  |- (.postcssrc|.postcssrc.json|.postcssrc.yml)
  |- package.json

.postcssrc.json

{
  "parser": "sugarss",
  "map": false,
  "plugins": {
    "postcss-plugin": {}
  }
}

.postcssrc.yml

parser: sugarss
map: false
plugins:
  postcss-plugin: {}

`.postcssrc.js` or `postcss.config.js`

You may need some logic within your config. In this case create JS file named .postcssrc.js or postcss.config.js

Project (Root)
  |– client
  |– public
  |
  |- (.postcssrc.js|postcss.config.js)
  |- package.json

You can export the config as an {Object}

.postcssrc.js

module.exports = {
  parser: 'sugarss',
  map: false,
  plugins: {
    'postcss-plugin': {}
  }
}

Or export a {Function} that returns the config (more about the ctx param below)

.postcssrc.js

module.exports = (ctx) => ({
  parser: ctx.parser ? 'sugarss' : false,
  map: ctx.env === 'development' ? ctx.map : false,
  plugins: {
    'postcss-plugin': ctx.options.plugin
  }
})

Plugins can be loaded either using an {Object} or an {Array}

`{Object}`

.postcssrc.js

module.exports = ({ env }) => ({
  ...options,
  plugins: {
    'postcss-plugin': env === 'production' ? {} : false
  }
})

`{Array}`

.postcssrc.js

module.exports = ({ env }) => ({
  ...options,
  plugins: [
    env === 'production' ? require('postcss-plugin')() : false
  ]
})

:warning: When using an {Array}, make sure to require() each plugin

Options

Name	Type	Default	Description
`to`	`{String}`	`undefined`	Destination File Path
`map`	`{String\\|Object}`	`false`	Enable/Disable Source Maps
`from`	`{String}`	`undefined`	Source File Path
`parser`	`{String\\|Function}`	`false`	Custom PostCSS Parser
`syntax`	`{String\\|Function}`	`false`	Custom PostCSS Syntax
`stringifier`	`{String\\|Function}`	`false`	Custom PostCSS Stringifier

`parser`

.postcssrc.js

module.exports = {
  parser: 'sugarss'
}

`syntax`

.postcssrc.js

module.exports = {
  syntax: 'postcss-scss'
}

`stringifier`

.postcssrc.js

module.exports = {
  stringifier: 'midas'
}

`map`

.postcssrc.js

module.exports = {
  map: 'inline'
}

:warning: In most cases options.from && options.to are set by the third-party which integrates this package (CLI, gulp, webpack). It's unlikely one needs to set/use options.from && options.to within a config file. Unless you're a third-party plugin author using this module and its Node API directly dont't set options.from && options.to yourself

`to`

module.exports = {
  to: 'path/to/dest.css'
}

`from`

module.exports = {
  from: 'path/to/src.css'
}

Plugins

`{} || null`

The plugin will be loaded with defaults

'postcss-plugin': {} || null

.postcssrc.js

module.exports = {
  plugins: {
    'postcss-plugin': {} || null
  }
}

:warning: {} must be an empty {Object} literal

`{Object}`

The plugin will be loaded with given options

'postcss-plugin': { option: '', option: '' }

.postcssrc.js

module.exports = {
  plugins: {
    'postcss-plugin': { option: '', option: '' }
  }
}

`false`

The plugin will not be loaded

'postcss-plugin': false

.postcssrc.js

module.exports = {
  plugins: {
    'postcss-plugin': false
  }
}

`Ordering`

Plugin execution order is determined by declaration in the plugins section (top-down)

{
  plugins: {
    'postcss-plugin': {}, // [0]
    'postcss-plugin': {}, // [1]
    'postcss-plugin': {}  // [2]
  }
}

Context

When using a {Function} (postcss.config.js or .postcssrc.js), it's possible to pass context to postcss-load-config, which will be evaluated while loading your config. By default ctx.env (process.env.NODE_ENV) and ctx.cwd (process.cwd()) are available on the ctx {Object}

ℹ️ Most third-party integrations add additional properties to the ctx (e.g postcss-loader). Check the specific module's README for more information about what is available on the respective ctx

Examples

postcss.config.js

module.exports = (ctx) => ({
  parser: ctx.parser ? 'sugarss' : false,
  map: ctx.env === 'development' ? ctx.map : false,
  plugins: {
    'postcss-import': {},
    'postcss-nested': {},
    cssnano: ctx.env === 'production' ? {} : false
  }
})

"scripts": {
  "build": "NODE_ENV=production node postcss",
  "start": "NODE_ENV=development node postcss"
}

`Async`

const { readFileSync } = require('fs')

const postcss = require('postcss')
const postcssrc = require('postcss-load-config')

const css = readFileSync('index.sss', 'utf8')

const ctx = { parser: true, map: 'inline' }

postcssrc(ctx).then(({ plugins, options }) => {
  postcss(plugins)
    .process(css, options)
    .then((result) => console.log(result.css))
})

`Sync`

const { readFileSync } = require('fs')

const postcss = require('postcss')
const postcssrc = require('postcss-load-config')

const css = readFileSync('index.sss', 'utf8')

const ctx = { parser: true, map: 'inline' }

const { plugins, options } = postcssrc.sync(ctx)

"scripts": {
  "build": "NODE_ENV=production gulp",
  "start": "NODE_ENV=development gulp"
}

const { task, src, dest, series, watch } = require('gulp')

const postcss = require('gulp-postcssrc')

const css = () => {
  src('src/*.css')
    .pipe(postcss())
    .pipe(dest('dest'))
})

task('watch', () => {
  watch(['src/*.css', 'postcss.config.js'], css)
})

task('default', series(css, 'watch'))

"scripts": {
  "build": "NODE_ENV=production webpack",
  "start": "NODE_ENV=development webpack-dev-server"
}

webpack.config.js

module.exports = (env) => ({
  module: {
    rules: [
      {
        test: /\.css$/,
        use: [
          'style-loader',
          'css-loader',
          'postcss-loader'
        ]
      }
    ]
  }
})

Maintainers

Contributors

Michael Ciniawsky

Mateusz Derks

Security Contact

To report a security vulnerability, please use the Tidelift security contact. Tidelift will coordinate the fix and disclosure.

Ryan Dunckel

Patrick Gilday

Dalton Santos

README.md

Load Config

Install

Usage

package.json

.postcssrc

.postcssrc.js or postcss.config.js

{Object}

{Array}

Options

parser

syntax

stringifier

map

to

from

Plugins

{} || null

{Object}

false

Ordering

Context

Examples

Async

Sync

Maintainers

Contributors

Security Contact

`package.json`

`.postcssrc`

`.postcssrc.js` or `postcss.config.js`

`{Object}`

`{Array}`

`parser`

`syntax`

`stringifier`

`map`

`to`

`from`

`{} || null`

`{Object}`

`false`

`Ordering`

`Async`

`Sync`