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node_modules/stylelint/lib/rules/at-rule-name-case/README.md

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+# at-rule-name-case
+
+Specify lowercase or uppercase for at-rules names.
+
+```css
+   @media (min-width: 10px) {}
+/** ↑
+ * These at-rule names */
+```
+
+Only lowercase at-rule names are valid in SCSS.
+
+## Options
+
+`string`: `"lower"|"upper"`
+
+### `"lower"`
+
+The following patterns are considered warnings:
+
+```css
+@Charset 'UTF-8';
+```
+
+```css
+@cHarSeT 'UTF-8';
+```
+
+```css
+@CHARSET 'UTF-8';
+```
+
+```css
+@Media (min-width: 50em) {}
+```
+
+```css
+@mEdIa (min-width: 50em) {}
+```
+
+```css
+@MEDIA (min-width: 50em) {}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+@charset 'UTF-8';
+```
+
+```css
+@media (min-width: 50em) {}
+```
+
+### `"upper"`
+
+The following patterns are considered warnings:
+
+```css
+@Charset 'UTF-8';
+```
+
+```css
+@cHarSeT 'UTF-8';
+```
+
+```css
+@charset 'UTF-8';
+```
+
+```css
+@Media (min-width: 50em) {}
+```
+
+```css
+@mEdIa (min-width: 50em) {}
+```
+
+```css
+@media (min-width: 50em) {}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+@CHARSET 'UTF-8';
+```
+
+```css
+@MEDIA (min-width: 50em) {}
+```

node_modules/stylelint/lib/rules/at-rule-name-case/index.js

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+"use strict"
+
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+
+const ruleName = "at-rule-name-case"
+
+const messages = ruleMessages(ruleName, {
+  expected: (actual, expected) => `Expected "${actual}" to be "${expected}"`,
+})
+
+const rule = function (expectation) {
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, {
+      actual: expectation,
+      possible: [
+        "lower",
+        "upper",
+      ],
+    })
+    if (!validOptions) {
+      return
+    }
+
+    root.walkAtRules(atRule => {
+      const name = atRule.name
+
+      const expectedName = expectation === "lower"
+        ? name.toLowerCase()
+        : name.toUpperCase()
+
+      if (name === expectedName) {
+        return
+      }
+
+      report({
+        message: messages.expected(name, expectedName),
+        node: atRule,
+        ruleName,
+        result,
+      })
+    })
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule