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node_modules/stylelint/lib/rules/no-eol-whitespace/README.md

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+# no-eol-whitespace
+
+Disallow end-of-line whitespace.
+
+```css
+a { color: pink; }···
+/**               ↑
+ *  This whitespace */
+```
+
+## Options
+
+### `true`
+
+The following patterns are considered warnings:
+
+```css
+a { color: pink; }·
+```
+
+```css
+a { color: pink; }····
+```
+
+Comment strings are also checked -- so the following is a warning:
+
+```css
+/* something····
+ * something else */
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a { color: pink; }
+```
+
+```css
+/* something
+ * something else */
+```
+
+## Optional secondary options
+
+### `ignore: ["empty-lines"]`
+
+#### `"empty-lines"`
+
+Allow end-of-line whitespace for lines that are only whitespace, "empty" lines.
+
+The following patterns are *not* considered warnings:
+
+```css
+a {
+  color: pink;
+··
+  background: orange;
+}
+```
+
+```css
+····
+```
+
+```css
+a { color: pink; }
+····
+```

node_modules/stylelint/lib/rules/no-eol-whitespace/index.js

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+"use strict"
+
+const isOnlyWhitespace = require("../../utils/isOnlyWhitespace")
+const optionsMatches = require("../../utils/optionsMatches")
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+const styleSearch = require("style-search")
+
+const ruleName = "no-eol-whitespace"
+
+const messages = ruleMessages(ruleName, {
+  rejected: "Unexpected whitespace at end of line",
+})
+
+const whitespacesToReject = new Set([
+  " ",
+  "\t",
+])
+
+const rule = function (on, options) {
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, {
+      actual: on,
+    }, {
+      optional: true,
+      actual: options,
+      possible: {
+        ignore: ["empty-lines"],
+      },
+    })
+    if (!validOptions) {
+      return
+    }
+
+    const rootString = root.toString()
+    styleSearch({
+      source: rootString,
+      target: [
+        "\n",
+        "\r",
+      ],
+      comments: "check",
+    }, match => {
+      // If the character before newline is not whitespace, ignore
+      if (!whitespacesToReject.has(rootString[match.startIndex - 1])) {
+        return
+      }
+
+      if (optionsMatches(options, "ignore", "empty-lines")) {
+        // If there is only whitespace between the previous newline and
+        // this newline, ignore
+        const lineBefore = rootString.substring(match.startIndex + 1, rootString.lastIndexOf("\n", match.startIndex - 1))
+        if (isOnlyWhitespace(lineBefore)) {
+          return
+        }
+      }
+
+      report({
+        message: messages.rejected,
+        node: root,
+        index: match.startIndex - 1,
+        result,
+        ruleName,
+      })
+    })
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule