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node_modules/stylelint/lib/rules/selector-no-empty/README.md

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+# selector-no-empty
+
+***Deprecated: See [CHANGELOG](../../../CHANGELOG.md).***
+
+Disallow empty selectors.
+
+```css
+  a, , b {}
+/** ↑
+ * An empty selector */
+```
+
+Empty selectors (by themselves or within a selector list) invalidate a rule. This rule splits the selector list on `,`. Any part that has zero length or containing only whitespace is deemed empty.
+
+## Options
+
+### `true`
+
+The following patterns are considered warnings:
+
+```css
+{}
+```
+
+```css
+, .a, .b {}
+```
+
+```css
+.a, .b,  {}
+```
+
+```css
+.a, , .b {}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a {}
+```
+
+```css
+a, b {}
+```
+
+```css
+a.foo {}
+```

node_modules/stylelint/lib/rules/selector-no-empty/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 = "selector-no-empty"
+
+const messages = ruleMessages(ruleName, {
+  rejected: "Unexpected empty selector",
+})
+
+const rule = function (actual) {
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, { actual })
+    if (!validOptions) {
+      return
+    }
+
+    result.warn((
+      "'selector-no-empty' has been deprecated and in 8.0 will be removed."
+    ), {
+      stylelintType: "deprecation",
+      stylelintReference: "https://stylelint.io/user-guide/rules/selector-no-empty/",
+    })
+
+    root.walkRules(rule => {
+      let index = 0
+
+      rule.selector.split(",").forEach(item => {
+        index += item.length + 1
+
+        if (item.trim() !== "") {
+          return
+        }
+
+        report({
+          message: messages.rejected,
+          node: rule,
+          index: index - 1,
+          ruleName,
+          result,
+        })
+      })
+    })
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule