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node_modules/stylelint/lib/rules/declaration-block-trailing-semicolon/README.md

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+# declaration-block-trailing-semicolon
+
+Require or disallow a trailing semicolon within declaration blocks.
+
+```css
+a { background: orange; color: pink; }
+/**                                ↑
+ *                    This semicolon */
+```
+
+The trailing semicolon is the *last* semicolon in a declaration block and it is optional.
+
+This rule will ignore Less mixins, trailing `//` comments, and declaration blocks containing nested (at-)rules.
+
+## Options
+
+`string`: `"always"|"never"`
+
+### `"always"`
+
+There *must always* be a trailing semicolon.
+
+The following patterns are considered warnings:
+
+```css
+a { color: pink }
+```
+
+```css
+a { background: orange; color: pink }
+```
+
+```css
+a { @include foo }
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a { color: pink; }
+```
+
+```css
+a { background: orange; color: pink; }
+```
+
+```css
+a { @include foo; }
+```
+
+### `"never"`
+
+There *must never* be a trailing semicolon.
+
+The following patterns are considered warnings:
+
+```css
+a { color: pink; }
+```
+
+```css
+a { background: orange; color: pink; }
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a { color: pink }
+```
+
+```css
+a { background: orange; color: pink }
+```

node_modules/stylelint/lib/rules/declaration-block-trailing-semicolon/index.js

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+"use strict"
+
+const hasBlock = require("../../utils/hasBlock")
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+
+const ruleName = "declaration-block-trailing-semicolon"
+
+const messages = ruleMessages(ruleName, {
+  expected: "Expected a trailing semicolon",
+  rejected: "Unexpected trailing semicolon",
+})
+
+const rule = function (expectation) {
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, {
+      actual: expectation,
+      possible: [
+        "always",
+        "never",
+      ],
+    })
+    if (!validOptions) {
+      return
+    }
+
+    root.walkAtRules(atRule => {
+      if (atRule.parent === root) {
+        return
+      }
+      if (atRule !== atRule.parent.last) {
+        return
+      }
+      if (hasBlock(atRule)) {
+        return
+      }
+      checkLastNode(atRule)
+    })
+
+    root.walkDecls(decl => {
+      if (decl !== decl.parent.last) {
+        return
+      }
+      checkLastNode(decl)
+    })
+
+    function checkLastNode(node) {
+      let message
+
+      if (expectation === "always") {
+        if (node.parent.raws.semicolon) {
+          return
+        }
+        message = messages.expected
+      }
+      if (expectation === "never") {
+        if (!node.parent.raws.semicolon) {
+          return
+        }
+        message = messages.rejected
+      }
+
+      report({
+        message,
+        node,
+        index: node.toString().trim().length - 1,
+        result,
+        ruleName,
+      })
+    }
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule