postcss-import

PostCSS plugin to transform @importrules by inlining content.

This plugin can consume local files, node modules or web_modules.To resolve path of an @import rule, it can look into root directory(by default process.cwd()), web_modules, node_modulesor local modules.When importing a module, it will look for index.css or file referenced inpackage.json in the style or main fields.You can also provide manually multiples paths where to look at.

Notes:

• 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 fileto process, and will probably work as you can expect.
• This plugin works great withpostcss-url plugin,which will allow you to adjust assets url() (or even inline them) afterinlining imported files.
• In order to optimize output, this plugin will only import a file once ona given scope (root, media query...).Tests are made from the path & the content of imported files (using a hashtable).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 atpostcss-easy-import(which use this plugin under the hood).
• Imports which are not modified (by options.filter or because they are remoteimports) are moved to the top of the output.
• This plugin attempts to follow the CSS @import spec; @importstatements must precede all other statements (besides @charset).

Installation

$ npm install -D postcss-import

Usage

Unless your stylesheet is in the same place where you run postcss(process.cwd()), you will need to use from option to make relative importswork.

// dependencies
const fs = require("fs")
const postcss = require("postcss")
const atImport = require("postcss-import")

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

// process css
postcss()
  .use(atImport())
  .process(css, {
    // `from` option is needed here
    from: "css/input.css"
  })
  .then((result) => {
    const output = result.css

    console.log(output)
  })

css/input.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.

Options

filter

Type: Function
Default: () => true

Only transform imports for which the test function returns true. Imports forwhich the test function returns false will be left as is. The function getsthe path to import as an argument and should return a boolean.

root

Type: String
Default: process.cwd() or dirname ofthe 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 ofimported files.

path

Type: String|Array
Default: []

A string or an array of paths in where to look for files.

plugins

Type: Array
Default: undefined

An array of plugins to be applied on each imported files.

resolve

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 ofpaths or a promise resolving to the path(s). If you do not return an absolutepath, your path will be resolved to an absolute path using the defaultresolver.You can use resolve for this.

load

Type: Function
Default: null

You can overwrite the default loading way by setting this option.This function gets (filename, importOptions) arguments and returns content orpromised content.

skipDuplicates

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 todisable it.

addModulesDirectories

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. Ifyou provide your own resolver via the resolve configuration option above, thenthis value will be ignored.

Example with some options

const postcss = require("postcss")
const atImport = require("postcss-import")

postcss()
  .use(atImport({
    path: ["src/css"],
  }))
  .process(cssString)
  .then((result) => {
    const { css } = result
  })

dependency Message Support

postcss-import 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.

CONTRIBUTING

• ⇄ 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).

Changelog

License