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backend/frontend/node_modules/postcss-custom-selectors/README.md

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+# PostCSS Custom Selectors [<img src="https://postcss.github.io/postcss/logo.svg" alt="PostCSS" width="90" height="90" align="right">][postcss]
+
+[![NPM Version][npm-img]][npm-url]
+[![CSS Standard Status][css-img]][css-url]
+[![Build Status][cli-img]][cli-url]
+[![Support Chat][git-img]][git-url]
+
+[PostCSS Custom Selectors] lets you use Custom Selectors in CSS, following the
+[CSS Extensions] specification.
+
+```pcss
+@custom-selector :--heading h1, h2, h3;
+
+article :--heading + p {
+  margin-top: 0;
+}
+
+/* becomes */
+
+article h1 + p, article h2 + p, article h3 + p {}
+```
+
+## Usage
+
+Add [PostCSS Custom Selectors] to your project:
+
+```bash
+npm install postcss-custom-selectors --save-dev
+```
+
+Use [PostCSS Custom Selectors] to process your CSS:
+
+```js
+const postcssCustomSelectors = require('postcss-custom-selectors');
+
+postcssCustomSelectors.process(YOUR_CSS /*, processOptions, pluginOptions */);
+```
+
+Or use it as a [PostCSS] plugin:
+
+```js
+const postcss = require('postcss');
+const postcssCustomSelectors = require('postcss-custom-selectors');
+
+postcss([
+  postcssCustomSelectors(/* pluginOptions */)
+]).process(YOUR_CSS /*, processOptions */);
+```
+
+[PostCSS Custom Selectors] runs in all Node environments, with special instructions for:
+
+| [Node](INSTALL.md#node) | [PostCSS CLI](INSTALL.md#postcss-cli) | [Webpack](INSTALL.md#webpack) | [Create React App](INSTALL.md#create-react-app) | [Gulp](INSTALL.md#gulp) | [Grunt](INSTALL.md#grunt) |
+| --- | --- | --- | --- | --- | --- |
+
+## Options
+
+### preserve
+
+The `preserve` option determines whether custom selectors and rules using
+custom selectors should be preserved in their original form.
+
+```pcss
+@custom-selector :--heading h1, h2, h3;
+
+article :--heading + p {
+  margin-top: 0;
+}
+
+/* becomes */
+
+article h1 + p, article h2 + p, article h3 + p {}
+
+article :--heading + p {}
+```
+
+### importFrom
+
+The `importFrom` option specifies sources where custom selectors can be
+imported from, which might be CSS, JS, and JSON files, functions, and directly
+passed objects.
+
+```js
+postcssCustomSelectors({
+  importFrom: 'path/to/file.css' // => @custom-selector :--heading h1, h2, h3;
+});
+```
+
+```pcss
+article :--heading + p {
+  margin-top: 0;
+}
+
+/* becomes */
+
+article h1 + p, article h2 + p, article h3 + p {}
+```
+
+Multiple sources can be passed into this option, and they will be parsed in the
+order they are received. JavaScript files, JSON files, functions, and objects
+will need to namespace custom selectors using the `customProperties` or
+`custom-properties` key.
+
+```js
+postcssCustomSelectors({
+  importFrom: [
+    'path/to/file.css',
+    'and/then/this.js',
+    'and/then/that.json',
+    {
+      customSelectors: { ':--heading': 'h1, h2, h3' }
+    },
+    () => {
+      const customProperties = { ':--heading': 'h1, h2, h3' };
+
+      return { customProperties };
+    }
+  ]
+});
+```
+
+### exportTo
+
+The `exportTo` option specifies destinations where custom selectors can be
+exported to, which might be CSS, JS, and JSON files, functions, and directly
+passed objects.
+
+```js
+postcssCustomSelectors({
+  exportTo: 'path/to/file.css' // @custom-selector :--heading h1, h2, h3;
+});
+```
+
+Multiple destinations can be passed into this option, and they will be parsed
+in the order they are received. JavaScript files, JSON files, and objects will
+need to namespace custom selectors using the `customProperties` or
+`custom-properties` key.
+
+```js
+const cachedObject = { customSelectors: {} };
+
+postcssCustomSelectors({
+  exportTo: [
+    'path/to/file.css',   // @custom-selector :--heading h1, h2, h3;
+    'and/then/this.js',   // module.exports = { customSelectors: { ':--heading': 'h1, h2, h3' } }
+    'and/then/this.mjs',  // export const customSelectors = { ':--heading': 'h1, h2, h3' } }
+    'and/then/that.json', // { "custom-selectors": { ":--heading": "h1, h2, h3" } }
+    cachedObject,
+    customProperties => {
+      customProperties    // { ':--heading': 'h1, h2, h3' }
+    }
+  ]
+});
+```
+
+[cli-img]: https://img.shields.io/travis/postcss/postcss-custom-selectors.svg
+[cli-url]: https://travis-ci.org/postcss/postcss-custom-selectors
+[css-img]: https://cssdb.org/badge/custom-selectors.svg
+[css-url]: https://cssdb.org/#custom-selectors
+[git-img]: https://img.shields.io/badge/support-chat-blue.svg
+[git-url]: https://gitter.im/postcss/postcss
+[npm-img]: https://img.shields.io/npm/v/postcss-custom-selectors.svg
+[npm-url]: https://www.npmjs.com/package/postcss-custom-selectors
+
+[CSS Extensions]: https://drafts.csswg.org/css-extensions/#custom-selectors
+[PostCSS]: https://github.com/postcss/postcss
+[PostCSS Custom Selectors]: https://github.com/postcss/postcss-custom-selectors