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node_modules/stylelint/lib/rules/selector-descendant-combinator-no-non-space/README.md

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+# selector-descendant-combinator-no-non-space
+
+Disallow non-space characters for descendant combinators of selectors.
+
+```css
+.foo .bar .baz {}
+/** ↑    ↑
+* These descendant combinators */
+```
+
+This rule ensures that only a single space is used and ensures no tabs, newlines, nor multiple spaces are used for descendant combinators of selectors.
+
+## Options
+
+### `true`
+
+The following patterns are considered warnings:
+
+```css
+.foo  .bar {}
+```
+
+```css
+.foo
+.bar {}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+.foo .bar {}
+```

node_modules/stylelint/lib/rules/selector-descendant-combinator-no-non-space/index.js

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+"use strict"
+
+const isStandardSyntaxRule = require("../../utils/isStandardSyntaxRule")
+const parseSelector = require("../../utils/parseSelector")
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+const punctuationSets = require("../../reference/punctuationSets")
+
+const ruleName = "selector-descendant-combinator-no-non-space"
+
+const messages = ruleMessages(ruleName, {
+  rejected: nonSpaceCharacter => `Unexpected "${nonSpaceCharacter}"`,
+})
+
+const rule = function (actual) {
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, { actual })
+    if (!validOptions) {
+      return
+    }
+
+    root.walkRules(rule => {
+      if (!isStandardSyntaxRule(rule)) {
+        return
+      }
+
+      const selector = rule.selector
+
+      parseSelector(selector, result, rule, fullSelector => {
+        fullSelector.walkCombinators(combinatorNode => {
+          const value = combinatorNode.value
+
+          if (punctuationSets.nonSpaceCombinators.has(value)) {
+            return
+          }
+          if (value === " ") {
+            return
+          }
+
+          report({
+            result,
+            ruleName,
+            message: messages.rejected(value),
+            node: rule,
+            index: combinatorNode.sourceIndex,
+          })
+        })
+      })
+    })
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule