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postcss-selector-namespace
Advanced tools
A postcss plugin to prefix each rule with a specific selector
$ npm install postcss-selector-namespace
var postcss = require('postcss')
var selectorNamespace = require('postcss-selector-namespace')
var output = postcss()
.use(selectorNamespace({ selfSelector: ':--component', namespace: 'my-component' }))
.process(require('fs').readFileSync('input.css', 'utf8'))
.css
input.css
:--component {
color: black;
}
:--component.danger {
color: red;
}
h1, .h1 {
font-weight: bold;
}
will output the following css:
.my-component {
color: black;
}
.my-component.danger {
color: red;
}
.my-component h1, .my-component .h1 {
font-weight: bold;
}
Prepending :root
to a selector prevents the selector from being namespaced:
:root h1 {
font-weight: bold;
}
will output the selector without any namespace:
h1 {
font-weight: bold;
}
This plugin can also process scss files and output scss again using the
postcss-scss
module.
var postcss = require('postcss')
var postscss = require('postcss-scss')
var selectorNamespace = require('postcss-selector-namespace')
var output = postcss()
.use(selectorNamespace({ selfSelector: '&', namespace: 'my-component' }))
.process(require('fs').readFileSync('input.css', 'utf8'), { syntax: postscss })
.css
$break = 320px;
& {
float: left;
width: 250px;
h1 {
font-weight: bold;
font-size: 32px;
}
@media screen and (max-width: $break-small) {
width: 100px;
float: none;
h1 {
font-size: 24px;
}
}
}
outputs:
$break = 320px;
.my-component {
float: left;
width: 250px;
h1 {
font-weight: bold;
font-size: 32px;
}
@media screen and (max-width: $break-small) {
width: 100px;
float: none;
h1 {
font-size: 24px;
}
}
}
postcss-import
Using the excellent plugin postcss-import, we can easily namespace each component with its filename.
components/my-button.css
:--namespace {
border: 1px solid #666;
border-radius: 3px;
}
components/my-tabs.css
:--namespace {
display: flex;
}
.tab {
border: 1px solid #666;
border-bottom: none;
border-top-radius: 3px;
margin: 0 5px;
}
main.css
@import 'components/my-button.css';
@import 'components/my-tabs.css';
body {
margin: 0;
color: #333;
}
build.js
const fs = require('fs')
const path = require('path')
const postcss = require('postcss')
const postcssImport = require('postcss-import')
const postcssSelectorNamespace = require('postcss-selector-namespace')
let css = fs.readFileSync('main.css', 'utf8')
function getComponentName(filename) {
if (/components\//.test(filename)) {
return path.basename(filename).replace(/\.css$/, '')
}
return null
}
postcss()
.use(postcssImport({
transform(css, filename, options) {
let componentName = getComponentName(filename)
if (!componentName) {
return css
}
return postcss()
.use(postcssSelectorNamespace({ namespace: '.' + componentName }))
.process(css)
.then(result => result.css)
}
}))
.process(css, { from: 'main.css' })
.then(result => {
console.log(result.css)
})
node build.js
outputs:
.my-button {
border: 1px solid #666;
border-radius: 3px;
}
.my-tabs {
display: flex;
}
.my-tabs .tab {
border: 1px solid #666;
border-bottom: none;
border-top-radius: 3px;
margin: 0 5px;
}
body {
margin: 0;
color: #333;
}
namespace
(default: '.self'
)
The selector to prepend to each selector.
selfSelector
(default: :--namespace
)
The selector to use to apply rules directly to your namespace selector.
ignoreRoot
(default: true
)
Selector won't be namespaced if they start with the :root
pseudo-class.
rootSelector
(default: :root
)
If prefixed with this selector, selectors won't be namespaced.
dropRoot
(default: true
)
If true
, the rootSelector
will be stripped from the output.
FAQs
A postcss plugin to prefix each rule with a specific selector
We found that postcss-selector-namespace demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
Did you know?
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