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

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+# at-rule-no-vendor-prefix
+
+Disallow vendor prefixes for at-rules.
+
+```css
+    @-webkit-keyframes { 0% { top: 0; } }
+/**  ↑
+ * These prefixes */
+```
+
+## Options
+
+### `true`
+
+The following patterns are considered warnings:
+
+```css
+@-webkit-keyframes { 0% { top: 0; } }
+```
+
+```css
+@-ms-viewport { orientation: landscape; }
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+@keyframes { 0% { top: 0; } }
+```
+
+```css
+@viewport { orientation: landscape; }
+```

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

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+"use strict"
+
+const isAutoprefixable = require("../../utils/isAutoprefixable")
+const isStandardSyntaxAtRule = require("../../utils/isStandardSyntaxAtRule")
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+
+const ruleName = "at-rule-no-vendor-prefix"
+
+const messages = ruleMessages(ruleName, {
+  rejected: p => `Unexpected vendor-prefixed at-rule "@${p}"`,
+})
+
+const rule = function (actual) {
+  return function (root, result) {
+    const validOptions = validateOptions(result, ruleName, { actual })
+    if (!validOptions) {
+      return
+    }
+
+    root.walkAtRules(atRule => {
+      if (!isStandardSyntaxAtRule(atRule)) {
+        return
+      }
+
+      const name = atRule.name
+
+      if (name[0] !== "-") {
+        return
+      }
+
+      if (!isAutoprefixable.atRuleName(name)) {
+        return
+      }
+
+      report({
+        message: messages.rejected(name),
+        node: atRule,
+        result,
+        ruleName,
+      })
+    })
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule