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node_modules/stylelint/lib/rules/selector-pseudo-class-no-unknown/README.md

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+# selector-pseudo-class-no-unknown
+
+Disallow unknown pseudo-class selectors.
+
+```css
+    a:hover {}
+/**    ↑
+ * This pseudo-class selector */
+```
+
+This rule considers pseudo-class selectors defined in the CSS Specifications, up to and including Editor's Drafts, to be known.
+
+All vendor-prefixed pseudo-class selectors are ignored.
+
+## Options
+
+### `true`
+
+The following patterns are considered warnings:
+
+```css
+a:unknown {}
+```
+
+```css
+a:UNKNOWN {}
+```
+
+```css
+a:hoverr {}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a:hover {}
+```
+
+```css
+a:focus {}
+```
+
+```css
+:not(p) {}
+```
+
+```css
+input:-moz-placeholder {}
+```
+
+## Optional secondary options
+
+### `ignorePseudoClasses: ["/regex/", "string"]`
+
+Given:
+
+```js
+["/^my-/", "pseudo-class"]
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a:pseudo-class {}
+```
+
+```css
+a:my-pseudo {}
+```
+
+```css
+a:my-other-pseudo {}
+```

node_modules/stylelint/lib/rules/selector-pseudo-class-no-unknown/index.js

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+"use strict"
+
+const isStandardSyntaxRule = require("../../utils/isStandardSyntaxRule")
+const isStandardSyntaxSelector = require("../../utils/isStandardSyntaxSelector")
+const isCustomSelector = require("../../utils/isCustomSelector")
+const optionsMatches = require("../../utils/optionsMatches")
+const parseSelector = require("../../utils/parseSelector")
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+const keywordSets = require("../../reference/keywordSets")
+const _ = require("lodash")
+const postcss = require("postcss")
+
+const ruleName = "selector-pseudo-class-no-unknown"
+
+const messages = ruleMessages(ruleName, {
+  rejected: selector => `Unexpected unknown pseudo-class selector "${selector}"`,
+})
+
+const rule = function (actual, options) {
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, { actual }, {
+      actual: options,
+      possible: {
+        ignorePseudoClasses: [_.isString],
+      },
+      optional: true,
+    })
+    if (!validOptions) {
+      return
+    }
+
+    root.walkRules(rule => {
+      if (!isStandardSyntaxRule(rule)) {
+        return
+      }
+      const selector = rule.selector
+
+      // Return early before parse if no pseudos for performance
+
+      if (selector.indexOf(":") === -1) {
+        return
+      }
+
+      parseSelector(selector, result, rule, selectorTree => {
+        selectorTree.walkPseudos(pseudoNode => {
+          const value = pseudoNode.value
+
+          if (!isStandardSyntaxSelector(value)) {
+            return
+          }
+
+          if (isCustomSelector(value)) {
+            return
+          }
+
+          // Ignore pseudo-elements
+          if (value.slice(0, 2) === "::") {
+            return
+          }
+
+          if (optionsMatches(options, "ignorePseudoClasses", pseudoNode.value.slice(1))) {
+            return
+          }
+
+          const name = value.slice(1)
+
+          if (postcss.vendor.prefix(name)
+            || keywordSets.pseudoClasses.has(name.toLowerCase())
+            || keywordSets.pseudoElements.has(name.toLowerCase())
+          ) {
+            return
+          }
+
+          if (pseudoNode.prev()) {
+            const prevPseudoNodeValue = postcss.vendor.unprefixed(pseudoNode.prev().value.toLowerCase().slice(2))
+
+            if (keywordSets.webkitProprietaryPseudoElements.has(prevPseudoNodeValue)
+              && keywordSets.webkitProprietaryPseudoClasses.has(name.toLowerCase())
+            ) {
+              return
+            }
+          }
+
+          report({
+            message: messages.rejected(value),
+            node: rule,
+            index: pseudoNode.sourceIndex,
+            ruleName,
+            result,
+          })
+        })
+      })
+    })
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule