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node_modules/stylelint/lib/rules/selector-list-comma-newline-after/README.md

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+# selector-list-comma-newline-after
+
+Require a newline or disallow whitespace after the commas of selector lists.
+
+```css
+   a,
+   b↑{ color: pink; }
+/** ↑
+ * The newline after this comma */
+```
+
+End-of-line comments are allowed one space after the comma.
+
+```css
+a, /* comment */
+b { color: pink; }
+```
+
+## Options
+
+`string`: `"always"|"always-multi-line"|"never-multi-line"`
+
+### `"always"`
+
+There *must always* be a newline after the commas.
+
+The following patterns are considered warnings:
+
+```css
+a, b { color: pink; }
+```
+
+```css
+a
+, b { color: pink; }
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a,
+b { color: pink; }
+```
+
+```css
+a
+,
+b { color: pink; }
+```
+
+### `"always-multi-line"`
+
+There *must always* be a newline after the commas in multi-line selector lists.
+
+The following patterns are considered warnings:
+
+```css
+a
+, b { color: pink; }
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a, b { color: pink; }
+```
+
+```css
+a,
+b { color: pink; }
+```
+
+```css
+a
+,
+b { color: pink; }
+```
+
+### `"never-multi-line"`
+
+There *must never* be whitespace after the commas in multi-line selector lists.
+
+The following patterns are considered warnings:
+
+```css
+a
+, b { color: pink; }
+```
+
+```css
+a,
+b { color: pink; }
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a,b { color: pink; }
+```
+
+```css
+a
+,b { color: pink; }
+```

node_modules/stylelint/lib/rules/selector-list-comma-newline-after/index.js

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+"use strict"
+
+const isStandardSyntaxRule = require("../../utils/isStandardSyntaxRule")
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+const whitespaceChecker = require("../../utils/whitespaceChecker")
+const styleSearch = require("style-search")
+
+const ruleName = "selector-list-comma-newline-after"
+
+const messages = ruleMessages(ruleName, {
+  expectedAfter: () => "Expected newline after \",\"",
+  expectedAfterMultiLine: () => "Expected newline after \",\" in a multi-line list",
+  rejectedAfterMultiLine: () => "Unexpected whitespace after \",\" in a multi-line list",
+})
+
+const rule = function (expectation) {
+  const checker = whitespaceChecker("newline", expectation, messages)
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, {
+      actual: expectation,
+      possible: [
+        "always",
+        "always-multi-line",
+        "never-multi-line",
+      ],
+    })
+    if (!validOptions) {
+      return
+    }
+
+    root.walkRules(rule => {
+      if (!isStandardSyntaxRule(rule)) {
+        return
+      }
+      // Get raw selector so we can allow end-of-line comments, e.g.
+      // a, /* comment */
+      // b {}
+      const selector = rule.raws.selector ? rule.raws.selector.raw : rule.selector
+      styleSearch({
+        source: selector,
+        target: ",",
+        functionArguments: "skip",
+      }, match => {
+        const nextThreeChars = selector.substr(match.endIndex, 3)
+
+        // If there's a // comment, that means there has to be a newline
+        // ending the comment so we're fine
+        if (nextThreeChars === " //") {
+          return
+        }
+
+        // If there is a space and then a comment begins, look for the newline
+        // after that comment
+        const indextoCheckAfter = nextThreeChars === " /*" ? selector.indexOf("*/", match.endIndex) + 1 : match.startIndex
+        checker.afterOneOnly({
+          source: selector,
+          index: indextoCheckAfter,
+          err: m => report({
+            message: m,
+            node: rule,
+            index: match.startIndex,
+            result,
+            ruleName,
+          }),
+        })
+      })
+    })
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule