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node_modules/stylelint/lib/rules/at-rule-no-unknown/README.md

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+# at-rule-no-unknown
+
+Disallow unknown at-rules.
+
+```css
+    @unknown (max-width: 960px) {}
+/** ↑
+ * At-rules like this */
+```
+
+This rule considers at-rules defined in the CSS Specifications, up to and including Editor's Drafts, to be known.
+
+## Options
+
+### `true`
+
+The following patterns are considered warnings:
+
+```css
+@unknown {}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+@charset "UTF-8";
+```
+
+```css
+@CHARSET "UTF-8";
+```
+
+```css
+@media (max-width: 960px) {}
+```
+
+```css
+@font-feature-values Font One {
+  @styleset {}
+}
+```
+
+## Optional secondary options
+
+### `ignoreAtRules: ["/regex/", "string"]`
+
+Given:
+
+```js
+["/^my-/", "custom"]
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+@my-at-rule "x.css";
+```
+
+```css
+@my-other-at-rule {}
+```
+
+```css
+@custom {}
+```

node_modules/stylelint/lib/rules/at-rule-no-unknown/index.js

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+"use strict"
+
+const _ = require("lodash")
+const keywordSets = require("../../reference/keywordSets")
+const optionsMatches = require("../../utils/optionsMatches")
+const postcss = require("postcss")
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+
+const ruleName = "at-rule-no-unknown"
+
+const messages = ruleMessages(ruleName, {
+  rejected: atRule => `Unexpected unknown at-rule "${atRule}"`,
+})
+
+const rule = function (actual, options) {
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, { actual }, {
+      actual: options,
+      possible: {
+        ignoreAtRules: [_.isString],
+      },
+      optional: true,
+    })
+
+    if (!validOptions) {
+      return
+    }
+
+    root.walkAtRules(atRule => {
+      const name = atRule.name
+
+      // Return early if at-rule is to be ignored
+      if (optionsMatches(options, "ignoreAtRules", atRule.name)) {
+        return
+      }
+
+      if (
+        postcss.vendor.prefix(name)
+        || keywordSets.atRules.has(name.toLowerCase())
+      ) {
+        return
+      }
+
+      report({
+        message: messages.rejected(`@${name}`),
+        node: atRule,
+        ruleName,
+        result,
+      })
+    })
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule