scope-css  

Prefix or nest each style selector in a css string. Useful to create namespaced css for components, themes, applications, modular css etc. Also it is tiny.

Usage


``js
const scope = require('scope-css');

scope(
.my-component {}
.my-component-element {}
, '.parent');

/*

.parent .my-component {}
.parent .my-component-element {}

*/
`

API

css = scope(css, parent, options?)

Return css string with each rule prefixed with the parent selector. Note that parent selector itself will be ignored. Also each :host keyword will be replaced with parent value. Example:

`js
scope(
.panel {}
:host {}
:host .my-element {}
.panel .my-element {}
.my-element {}
, '.panel');

/*

.panel {}
.panel {}
.panel .my-element {}
.panel .my-element {}
.panel .my-element {}

*/
`

Options can scope keyframes via { keyframes: bool|prefixStr } option, eg.

`js
scope(
.panel {
animation: infinite loading 4s;
}
@keyframes loading {
from { top: 0; }
to { top: 100px; }
}
, '.panel', { keyframes: true })

/*

.panel {
animation: infinite panel-loading 4s;
}
@keyframes panel-loading {
from { top: 0; }
to { top: 100px; }
)
*/
`

css = scope.replace(css, 'replacement $1$2')

Apply replace to css, where $1 is matched selectors and $2 is rules for the selectors. It does not do any self/host detection, so use it for more flexible replacements.

`js
scope.replace(
.my-component, .my-other-component {
padding: 0;
}
, '$1');

// .my-component, .my-other-component
``

See also

* scoped css polyfill

Credits

Based on this question.