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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.
+
+<!-- prettier-ignore -->
+```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 violations:
+
+<!-- prettier-ignore -->
+```css
+@unknown {}
+```
+
+The following patterns are _not_ considered violations:
+
+<!-- prettier-ignore -->
+```css
+@charset "UTF-8";
+```
+
+<!-- prettier-ignore -->
+```css
+@CHARSET "UTF-8";
+```
+
+<!-- prettier-ignore -->
+```css
+@media (max-width: 960px) {}
+```
+
+<!-- prettier-ignore -->
+```css
+@font-feature-values Font One {
+  @styleset {}
+}
+```
+
+## Optional secondary options
+
+### `ignoreAtRules: ["/regex/", /regex/, "string"]`
+
+Given:
+
+```
+["/^my-/", "custom"]
+```
+
+The following patterns are _not_ considered violations:
+
+<!-- prettier-ignore -->
+```css
+@my-at-rule "x.css";
+```
+
+<!-- prettier-ignore -->
+```css
+@my-other-at-rule {}
+```
+
+<!-- prettier-ignore -->
+```css
+@custom {}
+```

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

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