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node_modules/stylelint/lib/rules/custom-property-pattern/README.md

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+# custom-property-pattern
+
+Specify a pattern for custom properties.
+
+```css
+a { --foo-: 1px; }
+/**   ↑
+ * The pattern of this */
+```
+
+## Options
+
+`regex|string`
+
+A string will be translated into a RegExp like so `new RegExp(yourString)` — so be sure to escape properly.
+
+Given the string:
+
+```js
+"foo-.+"
+```
+
+The following patterns are considered warnings:
+
+```css
+:root { --boo-bar: 0; }
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+:root { --foo-bar: 0; }
+```

node_modules/stylelint/lib/rules/custom-property-pattern/index.js

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+"use strict"
+
+const _ = require("lodash")
+const isCustomProperty = require("../../utils/isCustomProperty")
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+
+const ruleName = "custom-property-pattern"
+
+const messages = ruleMessages(ruleName, {
+  expected: "Expected custom property name to match specified pattern",
+})
+
+const rule = function (pattern) {
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, {
+      actual: pattern,
+      possible: [
+        _.isRegExp,
+        _.isString,
+      ],
+    })
+    if (!validOptions) {
+      return
+    }
+
+    const regexpPattern = _.isString(pattern) ? new RegExp(pattern) : pattern
+
+    root.walkDecls(decl => {
+      const prop = decl.prop
+
+      if (!isCustomProperty(prop)) {
+        return
+      }
+      if (regexpPattern.test(prop.slice(2))) {
+        return
+      }
+
+      report({
+        message: messages.expected,
+        node: decl,
+        result,
+        ruleName,
+      })
+    })
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule