PostCSS Prepend Selector

[PostCSS] plugin Prepend selector for each rule with optional exclude existing selector from prepending.

[PostCSS]: Version 8 https://github.com/postcss/postcss

The intention

The intention I had extended the plugin to create a user interface for the web using Vue-js and styled it with Tailwind-css. The Vue-js panel was
integrated into an existing website/application. So the styles created with Tailwind-css should be used exclusively in the Vue-js application.

That means this plugin is not really well developed. However, it serves its purpose without claiming to be a really well-tested script.

Usage in postcss.config.js with prepend-selector-postcss

``js
// postcss.config.js
const autoprefixer = require('autoprefixer');
const tailwindcss = require('tailwindcss');
// https://github.com/ledniy/postcss-prepend-selector
const prepend = require('prepend-selector-postcss')({
// requiured
selector: '.myPrefix ',
// optional can be omitted
exclude: ['.living_classname_to_prevent_from_prefixing '],
// optional can be omitted
excludePart: ['.grid-'],
// optional can be omitted -> body{some unwanted global reset stuff} -> body .selector{some unwanted global reset stuff}
appendTo:['body'],
// optional can be omitted -> Prefixing special selectors with a string that not exists in html tags to prevent using "body" - selector
// body{some unwanted global reset stuff} -> i_had_made_invalid_body{some unwanted global reset stuff}
makeInvalid: {
selectors: ['body'],
invalidPrefix: 'i_had_made_invalid_'
}
})
module.exports = {
purge : [
'./public/*/.html',
'./src/*/.{js,jsx,ts,tsx,vue}',
],
plugins: [
tailwindcss,
prepend,
autoprefixer,
],
};
`

$3

`js
// minimal example
postcss([require('prepend-selector-postcss')({
selector: '.myPrefix '
})])
`

Original Css

`css
.foo {
/ Input example /
}

.foo, .bar {
/ Input example /
}

`

Result

`css
.myPrefix .foo {
/ Output example /
}

.myPrefix .foo, .myPrefix .bar {
/ Output example /
}
`

$3

`js
// example with exclude
postcss([require('prepend-selector-postcss')({
selector: '.myPrefix ',
exclude : ['#living_id_prefix_to_prevent_from_prefixing ', '.living_classname_to_prevent_from_prefixing '],
})])
`

Original Css

`css
.foo {
/ Input example /
}

.foo, .bar {
/ Input example /
}

#living_id_prefix_to_prevent_from_prefixing {
/ Input example /
}

.living_classname_to_prevent_from_prefixing {
/ Input example /
}

.living_classname_to_prevent_from_prefixing .somethingSub {
/ Input example /
}
`

Result

`css
.myPrefix .foo {
/ Output example /
}

.myPrefix .foo, .myPrefix .bar {
/ Output example /
}

/ not prefixed /
#living_id_prefix_to_prevent_from_prefixing {
/ Input example /
}

/ not prefixed /
.living_classname_to_prevent_from_prefixing {
/ Input example /
}

/ not prefixed /
.living_classname_to_prevent_from_prefixing .somethingSub {
/ Input example /
}
`

$3

`js

// exclude everything which starts with ".grid"
// excludes .grid-x | .grid .mySubClass
postcss([require('prepend-selector-postcss')({
selector : '.myPrefix ',
excludePart: ['.grid']
})])
`

Original Css

`css
.foo {
/ Input example /
}

.foo, .bar {
/ Input example /
}

.grid .padding {
/ Input example /
}

.grid-x .cell {
/ Input example /
}
`

Result

`css
.myPrefix .foo {
/ Output example /
}

.myPrefix .foo, .myPrefix .bar {
/ Output example /
}

/ not prefixed /
.grid .padding {
/ Input example /
}

/ not prefixed /
.grid-x .cell {
/ Input example /
}
`

$3

`js
// Full example
postcss([require('prepend-selector-postcss')({
selector : '.myPrefix ',
exclude : ['#living_id_prefix_to_prevent_from_prefixing ', '.living_classname_to_prevent_from_prefixing '],
excludePart: ['.grid']
})])
`

Original Css

`css
.foo {
/ Input example /
}

.foo, .bar {
/ Input example /
}

#living_id_prefix_to_prevent_from_prefixing {
/ Input example /
}

.living_classname_to_prevent_from_prefixing {
/ Input example /
}

.living_classname_to_prevent_from_prefixing .somethingSub {
/ Input example /
}

.grid .padding {
/ Input example /
}

.grid-x .cell {
/ Input example /
}
`

Result

`css
.myPrefix .foo {
/ Output example /
}

.myPrefix .foo, .myPrefix .bar {
/ Output example /
}

/ not prefixed /
#living_id_prefix_to_prevent_from_prefixing {
/ Input example /
}

/ not prefixed /
.living_classname_to_prevent_from_prefixing {
/ Input example /
}

/ not prefixed /
.living_classname_to_prevent_from_prefixing .somethingSub {
/ Input example /
}

/ not prefixed /
.grid .padding {
/ Input example /
}

/ not prefixed /
.grid-x .cell {
/ Input example /
}
``

$3

Please do not forget "selector" and "exclude" the space at the end of the string. exclude and excludePart are not tested. feel free to fork.

See [PostCSS] docs for examples for your environment.

$3

https://github.com/ledniy/postcss-prepend-selector