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

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+# PostCSS Custom Properties [<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 Properties] lets you use Custom Properties in CSS, following
+the [CSS Custom Properties] specification.
+
+```pcss
+:root {
+  --color: red;
+}
+
+h1 {
+  color: var(--color);
+}
+
+/* becomes */
+
+:root {
+  --color: red;
+}
+
+h1 {
+  color: red;
+  color: var(--color);
+}
+```
+
+## Usage
+
+Add [PostCSS Custom Properties] to your project:
+
+```bash
+npm install postcss-custom-properties --save-dev
+```
+
+Use [PostCSS Custom Properties] to process your CSS:
+
+```js
+const postcssCustomProperties = require('postcss-custom-properties');
+
+postcssCustomProperties.process(YOUR_CSS /*, processOptions, pluginOptions */);
+```
+
+Or use it as a [PostCSS] plugin:
+
+```js
+const postcss = require('postcss');
+const postcssCustomProperties = require('postcss-custom-properties');
+
+postcss([
+  postcssCustomProperties(/* pluginOptions */)
+]).process(YOUR_CSS /*, processOptions */);
+```
+
+[PostCSS Custom Properties] 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 Properties and properties using
+custom properties should be preserved in their original form. By default, both
+of these are preserved.
+
+```js
+postcssCustomProperties({
+  preserve: false
+});
+```
+
+```pcss
+:root {
+  --color: red;
+}
+
+h1 {
+  color: var(--color);
+}
+
+/* becomes */
+
+h1 {
+  color: red;
+}
+```
+
+### importFrom
+
+The `importFrom` option specifies sources where Custom Properties can be imported
+from, which might be CSS, JS, and JSON files, functions, and directly passed
+objects.
+
+```js
+postcssCustomProperties({
+  importFrom: 'path/to/file.css' // => :root { --color: red }
+});
+```
+
+```pcss
+h1 {
+  color: var(--color);
+}
+
+/* becomes */
+
+h1 {
+  color: red;
+}
+```
+
+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 Properties using the `customProperties` or
+`custom-properties` key.
+
+```js
+postcssCustomProperties({
+  importFrom: [
+    'path/to/file.css',   // :root { --color: red; }
+    'and/then/this.js',   // module.exports = { customProperties: { '--color': 'red' } }
+    'and/then/that.json', // { "custom-properties": { "--color": "red" } }
+    {
+      customProperties: { '--color': 'red' }
+    },
+    () => {
+      const customProperties = { '--color': 'red' };
+
+      return { customProperties };
+    }
+  ]
+});
+```
+
+See example imports written in [CSS](test/import-properties.css),
+[JS](test/import-properties.js), and [JSON](test/import-properties.json).
+
+### exportTo
+
+The `exportTo` option specifies destinations where Custom Properties can be exported
+to, which might be CSS, JS, and JSON files, functions, and directly passed
+objects.
+
+```js
+postcssCustomProperties({
+  exportTo: 'path/to/file.css' // :root { --color: red; }
+});
+```
+
+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 Properties using the `customProperties` or
+`custom-properties` key.
+
+```js
+const cachedObject = { customProperties: {} };
+
+postcssCustomProperties({
+  exportTo: [
+    'path/to/file.css',   // :root { --color: red; }
+    'and/then/this.js',   // module.exports = { customProperties: { '--color': 'red' } }
+    'and/then/this.mjs',  // export const customProperties = { '--color': 'red' } }
+    'and/then/that.json', // { "custom-properties": { "--color": "red" } }
+    cachedObject,
+    customProperties => {
+      customProperties    // { '--color': 'red' }
+    }
+  ]
+});
+```
+
+See example exports written to [CSS](test/export-properties.css),
+[JS](test/export-properties.js), [MJS](test/export-properties.mjs), and
+[JSON](test/export-properties.json).
+
+[cli-img]: https://img.shields.io/travis/postcss/postcss-custom-properties/master.svg
+[cli-url]: https://travis-ci.org/postcss/postcss-custom-properties
+[css-img]: https://cssdb.org/badge/custom-properties.svg
+[css-url]: https://cssdb.org/#custom-properties
+[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-properties.svg
+[npm-url]: https://www.npmjs.com/package/postcss-custom-properties
+
+[CSS Custom Properties]: https://www.w3.org/TR/css-variables-1/
+[PostCSS]: https://github.com/postcss/postcss
+[PostCSS Custom Properties]: https://github.com/postcss/postcss-custom-properties