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node_modules/stylelint/lib/rules/custom-property-no-outside-root/README.md

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+# custom-property-no-outside-root
+
+***Deprecated: See [CHANGELOG](../../../CHANGELOG.md).***
+
+Disallow custom properties outside of `:root` rules.
+
+```css
+    a { --foo: 1px; }
+/** ↑   ↑
+ * These selectors and these types of custom properties */
+```
+
+## Options
+
+### `true`
+
+The following patterns are considered warnings:
+
+```css
+a { --foo: 1px; }
+```
+
+```css
+:root, a { --foo: 1px; }
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+:root { --foo: 1px; }
+```

node_modules/stylelint/lib/rules/custom-property-no-outside-root/index.js

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+"use strict"
+
+const isCustomProperty = require("../../utils/isCustomProperty")
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+
+const ruleName = "custom-property-no-outside-root"
+
+const messages = ruleMessages(ruleName, {
+  rejected: "Unexpected custom property",
+})
+
+const rule = function (actual) {
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, { actual })
+    if (!validOptions) {
+      return
+    }
+
+    result.warn((
+      `'${ruleName}' has been deprecated and in 8.0 will be removed.`
+    ), {
+      stylelintType: "deprecation",
+      stylelintReference: `https://stylelint.io/user-guide/rules/${ruleName}/`,
+    })
+
+    root.walkRules(rule => {
+      // Ignore rules whose selector is just `:root`
+      if (rule.selector.toLowerCase().trim() === ":root") {
+        return
+      }
+
+      rule.walkDecls(decl => {
+        if (!isCustomProperty(decl.prop)) {
+          return
+        }
+        report({
+          message: messages.rejected,
+          node: decl,
+          result,
+          ruleName,
+        })
+      })
+    })
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule