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css-selector-extract
Advanced tools
Readme
With selector extracting, it is possible to extract certain CSS selectors (RegEx can be used to match selectors) from CSS code. This is especially useful if you want to extract only a few CSS classes from a huge library or framework.
const cssSelectorExtract = require('css-selector-extract');
const options = {
// CSS source code as string.
css: '.btn { } .btn-alert { } .btn-success { }',
// Array of selectors which should get extracted.
filters: ['.btn']
};
// Asynchronous:
cssSelectorExtract.process(options).then((extractedCss) => {
console.log(extractedCss); // Outputs: `.btn { }`.
});
// Synchronous:
const extractedCss = cssSelectorExtract.processSync(options);
console.log(extractedCss); // Outputs: `.btn { }`.
const cssSelectorExtract = require('css-selector-extract');
const options = {
// CSS source code as string.
css: '.btn { } .btn-alert { } .btn-success { }',
// Array of selector filter objects with selectors
// which should get extracted and replaced.
filters: [{ selector: '.btn', replacement: '.button' }]
};
// Asynchronous:
cssSelectorExtract.process(options).then((extractedCss) => {
console.log(extractedCss); // Outputs: `.button { }`.
});
const cssSelectorExtract = require('css-selector-extract');
const options = {
css: '.btn { } .btn-alert { }',
filters: [/^\..+-alert/]
};
cssSelectorExtract.process(options).then((extractedCss) => {
console.log(extractedCss); // Outputs: `.btn-alert { }`.
});
const cssSelectorExtract = require('css-selector-extract');
const options = {
css: '.btn { } .btn-alert { }',
filters: [{ selector: /^\.btn(.*)/, replacement: '.button$1' }]
};
cssSelectorExtract.process(options).then((extractedCss) => {
console.log(extractedCss); // Outputs: `.button { } .button-alert { }`.
});
Install the corresponding postcss syntax plugin (e.g. postcss-scss or postcss-less).
const cssSelectorExtract = require('css-selector-extract');
const postcssScss = require('postcss-scss');
const options = {
css: '.nested { .selector { } }',
filters: ['.nested'],
postcssSyntax: postcssScss
};
cssSelectorExtract.process(options).then((extractedCss) => {
console.log(extractedCss);
});
Usually css-selector-extract
removes all nodes which do not match the given selectors. However under some circumstances it might be useful to preserve the original line numbers (e.g. to keep source map references intact).
const cssSelectorExtract = require('css-selector-extract');
const options = {
css: '.multiple { } .selectors {}',
filters: ['.some-selector'],
preserveLines: true
};
cssSelectorExtract.process(options).then((extractedCss) => {
// Outputs the extracted selector(s) with empty lines where
// other selectors got removed to preserve line numbers.
console.log(extractedCss);
});
import { process, processSync } from 'css-selector-extract';
const options = {
// CSS source code as string.
css: '.btn { } .btn-alert { } .btn-success { }',
// Array of selectors which should get extracted.
filters: ['.btn']
};
// Asynchronous:
process(options).then((extractedCss) => {
console.log(extractedCss); // Outputs: `.btn { }`.
});
// Synchronous:
const extractedCss = processSync(options);
console.log(extractedCss); // Outputs: `.btn { }`.
With version 3.0.0 css-selector-extract takes an object as it's only parameter.
const cssSelectorExtract = require('css-selector-extract');
const postcssScss = require('postcss-scss');
// New way:
const options = {
css: '.btn { } .btn-alert { } .btn-success { }',
filters: ['.btn'],
postcssSyntax: postcssScss
};
cssSelectorExtract.process(options);
cssSelectorExtract.processSync(options);
// Old way:
const css = '.btn { } .btn-alert { } .btn-success { }';
const selectorFilters = ['.btn'];
cssSelectorExtract.process(css, selectorFilters, postcssScss);
cssSelectorExtract.processSync(css, selectorFilters, postcssScss);
See CONTRIBUTING.md
npm test
Markus Oberlehner
Website: https://markus.oberlehner.net
Twitter: https://twitter.com/MaOberlehner
PayPal.me: https://paypal.me/maoberlehner
Patreon: https://www.patreon.com/maoberlehner
MIT
FAQs
Extract certain CSS selectors form CSS code
The npm package css-selector-extract receives a total of 73,876 weekly downloads. As such, css-selector-extract popularity was classified as popular.
We found that css-selector-extract demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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