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node_modules/stylelint/lib/rules/at-rule-whitelist/README.md

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+# at-rule-whitelist
+
+Specify a whitelist of allowed at-rules.
+
+```css
+    @keyframes name {}
+/** ↑
+ * At-rules like this */
+```
+
+## Options
+
+`array|string`: `["array", "of", "unprefixed", "at-rules"]|"at-rule"`
+
+Given:
+
+```js
+["extend", "keyframes"]
+```
+
+The following patterns are considered warnings:
+
+```css
+@import "path/to/file.css";
+```
+
+```css
+@media screen and (max-width: 1024px) {
+  a { display: none; }
+}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a { @extend placeholder; }
+```
+
+```css
+@keyframes name {
+  from { top: 10px; }
+  to { top: 20px; }
+}
+```
+
+```css
+@KEYFRAMES name {
+  from { top: 10px; }
+  to { top: 20px; }
+}
+```
+
+```css
+@-moz-keyframes name {
+  from { top: 10px; }
+  to { top: 20px; }
+}

node_modules/stylelint/lib/rules/at-rule-whitelist/index.js

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+"use strict"
+
+const _ = require("lodash")
+const postcss = require("postcss")
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+
+const ruleName = "at-rule-whitelist"
+
+const messages = ruleMessages(ruleName, {
+  rejected: name => `Unexpected at-rule "${name}"`,
+})
+
+const rule = function (whitelistInput) {
+  // To allow for just a string as a parameter (not only arrays of strings)
+  const whitelist = [].concat(whitelistInput)
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, {
+      actual: whitelist,
+      possible: [_.isString],
+    })
+    if (!validOptions) {
+      return
+    }
+
+    root.walkAtRules(atRule => {
+      const name = atRule.name
+
+      if (whitelist.indexOf(postcss.vendor.unprefixed(name).toLowerCase()) !== -1) {
+        return
+      }
+
+      report({
+        message: messages.rejected(name),
+        node: atRule,
+        result,
+        ruleName,
+      })
+    })
+  }
+}
+
+rule.primaryOptionArray = true
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule