PostCSS plugin to import CSS files

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PostCSS plugin to transform @import
rules by inlining content.
This plugin can consume local files, node modules or webmodules. To resolve path of an @import rule, it can look into root directory (by default process.cwd()), web_modules, node_modules or local modules. When importing a module, it will look for index.css or file referenced in package.json in the style or main fields. You can also provide manually multiples paths where to look at.
  • This plugin should probably be used as the first plugin of your list.
This way, other plugins will work on the AST as if there were only a single file to process, and will probably work as you can expect.
  • This plugin works great with
plugin, which will allow you to adjust assets url() (or even inline them) after inlining imported files.
  • In order to optimize output, this plugin will only import a file once on
a given scope (root, media query...). Tests are made from the path & the content of imported files (using a hash table). If this behavior is not what you want, look at skipDuplicates option
  • If you are looking for glob, or sass like imports (prefixed partials),
please look at postcss-easy-import (which use this plugin under the hood).
  • This plugin attempts to follow the CSS @import spec; @import
statements must precede all other statements (besides @charset).


$ npm install postcss postcss-import-sync2


Unless your stylesheet is in the same place where you run postcss (process.cwd()), you will need to use from option to make relative imports work.
// dependencies
var fs = require("fs")
var postcss = require("postcss")
var atImport = require("postcss-import-sync2")

// css to be processed
var css = fs.readFileSync("css/input.css", "utf8")

// process css
  .process(css, {
    // `from` option is needed here
    from: "css/input.css"
  .then(function (result) {
    var output = result.css


/* can consume `node_modules`, `web_modules` or local modules */
@import "cssrecipes-defaults"; /* == @import "../node_modules/cssrecipes-defaults/index.css"; */
@import "normalize.css"; /* == @import "../node_modules/normalize.css/normalize.css"; */

@import "foo.css"; /* relative to css/ according to `from` option above */

@import "bar.css" (min-width: 25em);

body {
  background: black;

will give you:
/* ... content of ../node_modules/cssrecipes-defaults/index.css */
/* ... content of ../node_modules/normalize.css/normalize.css */

/* ... content of css/foo.css */

@media (min-width: 25em) {
/* ... content of css/bar.css */

body {
  background: black;

Checkout the tests for more examples.



Type: boolean Default: false
Whether to process under sync mode, typically for require hooks


Type: String Default: process.cwd() or dirname of the postcss from
Define the root where to resolve path (eg: place where node_modules are). Should not be used that much.
Note: nested @import will additionally benefit of the relative dirname of imported files.


Type: String|Array Default: []
A string or an array of paths in where to look for files.


Type: Array Default: undefined
An array of plugins to be applied on each imported files.


Type: Function Default: null
You can provide a custom path resolver with this option. This function gets (id, basedir, importOptions) arguments and should return a path, an array of paths or a promise resolving to the path(s). If you do not return an absolute path, your path will be resolved to an absolute path using the default resolver. You can use resolve
for this.


Type: Function Default: null
You can overwrite the default loading way by setting this option. This function gets (filename, importOptions) arguments and returns content or promised content.


Type: Boolean Default: true
By default, similar files (based on the same content) are being skipped. It's to optimize output and skip similar files like normalize.css for example. If this behavior is not what you want, just set this option to false to disable it.


Type: Array Default: []
An array of folder names to add to Node's resolver. Values will be appended to the default resolve directories: ["node_modules", "web_modules"].
This option is only for adding additional directories to default resolver. If you provide your own resolver via the resolve configuration option above, then this value will be ignored.

Example with some options

var postcss = require("postcss")
var atImport = require("postcss-import-sync2")

    path: ["src/css"],
  .then(function (result) {
    var css = result.css

dependency Message Support

postcss-import-sync2 adds a message to result.messages for each @import. Messages are in the following format:
  type: 'dependency',
  file: absoluteFilePath,
  parent: fileContainingTheImport

This is mainly for use by postcss runners that implement file watching.


  • ⇄ Pull requests and ★ Stars are always welcome.
  • For bugs and feature requests, please create an issue.
  • Pull requests must be accompanied by passing automated tests ($ npm test).