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Showing content from https://github.com/reducejs/css-module-deps below:

reducejs/css-module-deps: walk the css dependency graph to generate a stream of json output.

Walk the css dependency graph to generate a stream of json output.

• depsify
• reduce-css
• reduce-css-postcss

var Deps = require('..')
var path = require('path')
var url = require('postcss-custom-url')
var atImport = require('postcss-simple-import')
var vars = require('postcss-advanced-variables')
var JSONStream = require('JSONStream')

var fixtures = path.resolve.bind(path, __dirname, 'src')

var stream = Deps({
  atRuleName: 'external',
  basedir: fixtures(),
  processor: [ atImport(), url(), vars() ],
})
stream.end({ file: './import-and-deps.css' })

stream.pipe(
  JSONStream.stringify(false, null, null, 2)
)
.pipe(process.stdout)

Directory structure:

⌘ tree example/src
example/src
├── import-and-deps.css
├── import-url.css
└── node_modules
    ├── helper
    │   └── vars.css
    └── sprites
        └── dialog
            ├── index.css
            └── sp-dialog.png

import-and-deps.css:

@external "./import-url";
@import "helper/vars";

.import-and-deps {
  color: $red;
}

import-url.css

@import "sprites/dialog";
.importUrl{}

helper/vars.css:

sprites/dialog/index.css:

.dialog {
  background: url(sp-dialog.png)
}

output:

⌘ node example/deps.js
{
  "file": "/Users/zoubin/usr/src/self/css-module-deps/example/src/import-url.css",
  "source": ".dialog {\n  background: url(node_modules/sprites/dialog/sp-dialog.png)\n}\n.importUrl{}\n\n",
  "deps": {},
  "id": "/Users/zoubin/usr/src/self/css-module-deps/example/src/import-url.css"
}
{
  "file": "/Users/zoubin/usr/src/self/css-module-deps/example/src/import-and-deps.css",
  "source": ".import-and-deps {\n  color: #FF0000;\n}\n\n",
  "deps": {
    "./import-url": "/Users/zoubin/usr/src/self/css-module-deps/example/src/import-url.css"
  },
  "id": "/Users/zoubin/usr/src/self/css-module-deps/example/src/import-and-deps.css"
}

Return an object stream that expects { file: ... } objects as input, and produces objects for every dependency from a recursive module traversal as output.

Specify how to resolve a file path

Type: Function

Receives the string to be resolved, and an option object with basedir.

Should return a promise, or the absolute path.

Specify which files to skip parsing.

Type: Array

Passed to multimatch to do matching.

Specify the name of at-rules to declare a dependency.

Type: String

Default: deps

Dependencies are declared through the @deps at-rule by default.

Used to transform each file in the dependency graph.

Type: Function, Array

Signature: fn(result)

Return a promise to make it asynchronous.

result is an instance of Result.

Specify postcss plugins to transform css file contents.

Type: Array

Type: String

Used to resolve input filenames.

To filter the resolved dependencies.

Type: Function

Signature: var newDeps = dependenciesFilter(deps, file)

var r = new Result(row)

Each row has the following fields:

• file: file path
• source: file contents

Read or modify r.root (the AST object) or r.css to do transformations.

Usually, you do not have to access both.

r.from is the file path.

r is an emitter.

Before readFile called.

Before applying transforms.

result is an Result.

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