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node_modules/stylelint/lib/rules/string-no-newline/README.md

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+# string-no-newline
+
+Disallow (unescaped) newlines in strings.
+
+```css
+a {
+  content: "first
+    second";     ↑
+}                ↑
+/**              ↑
+ * The newline here */
+```
+
+[The spec](https://www.w3.org/TR/CSS2/syndata.html#strings) says this: "A string cannot directly contain a newline. To include a newline in a string, use an escape representing the line feed character in ISO-10646 (U+000A), such as \"\A\" or \"\00000a\"." And also: "It is possible to break strings over several lines, for aesthetic or other reasons, but in such a case the newline itself has to be escaped with a backslash (\)."
+
+## Options
+
+### `true`
+
+The following patterns are considered warnings:
+
+```css
+a {
+  content: "first
+    second";     
+}  
+```
+
+```css
+[title="something
+is probably wrong"] {}  
+```
+
+```css
+a {
+  font-family: "Times
+    New
+    Roman";
+}  
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a {
+  content: "first\Asecond";     
+}  
+```
+
+```css
+a {
+  content: "first\\nsecond";     
+}  
+```
+
+```css
+[title="nothing\
+  is wrong"] {}  
+```
+
+```css
+a {
+  font-family: "Times New Roman";
+}  
+```

node_modules/stylelint/lib/rules/string-no-newline/index.js

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+"use strict"
+
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+const styleSearch = require("style-search")
+
+const ruleName = "string-no-newline"
+
+const messages = ruleMessages(ruleName, {
+  rejected: "Unexpected newline in string",
+})
+
+const rule = function (actual) {
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, { actual })
+    if (!validOptions) {
+      return
+    }
+
+    const cssString = root.toString()
+    styleSearch({
+      source: cssString,
+      target: "\n",
+      strings: "only",
+    }, match => {
+      const charBefore = cssString[match.startIndex - 1]
+      let index = match.startIndex
+      if (charBefore === "\\") {
+        return
+      }
+      if (charBefore === "\r") index -= 1
+      report({
+        message: messages.rejected,
+        node: root,
+        index,
+        result,
+        ruleName,
+      })
+    })
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule