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node_modules/stylelint/lib/rules/font-family-no-duplicate-names/README.md

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+# font-family-no-duplicate-names
+
+Disallow duplicate font family names.
+
+<!-- prettier-ignore -->
+```css
+a { font-family: serif, serif; }
+/**              ↑      ↑
+ * These font family names */
+```
+
+This rule checks the `font` and `font-family` properties.
+
+This rule ignores `$sass`, `@less`, and `var(--custom-property)` variable syntaxes.
+
+**Caveat:** This rule will stumble on _unquoted_ multi-word font names and _unquoted_ font names containing escape sequences. Wrap these font names in quotation marks, and everything should be fine.
+
+## Options
+
+### `true`
+
+The following patterns are considered violations:
+
+<!-- prettier-ignore -->
+```css
+a { font-family: 'Times', Times, serif; }
+```
+
+<!-- prettier-ignore -->
+```css
+a { font: 1em "Arial", 'Arial', sans-serif; }
+```
+
+<!-- prettier-ignore -->
+```css
+a { font: normal 14px/32px -apple-system, BlinkMacSystemFont, sans-serif, sans-serif; }
+```
+
+The following patterns are _not_ considered violations:
+
+<!-- prettier-ignore -->
+```css
+a { font-family: Times, serif; }
+```
+
+<!-- prettier-ignore -->
+```css
+a { font: 1em "Arial", "sans-serif", sans-serif; }
+```
+
+<!-- prettier-ignore -->
+```css
+a { font: normal 14px/32px -apple-system, BlinkMacSystemFont, sans-serif; }
+```
+
+## Optional secondary options
+
+### `ignoreFontFamilyNames: ["/regex/", /regex/, "string"]`
+
+Given:
+
+```
+["/^My Font /", "monospace"]
+```
+
+The following patterns are _not_ considered violations:
+
+<!-- prettier-ignore -->
+```css
+font-family: monospace, monospace
+```
+
+<!-- prettier-ignore -->
+```css
+font-family: "My Font Family", "My Font Family", monospace
+```

node_modules/stylelint/lib/rules/font-family-no-duplicate-names/index.js

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+// @ts-nocheck
+
+'use strict';
+
+const _ = require('lodash');
+const declarationValueIndex = require('../../utils/declarationValueIndex');
+const findFontFamily = require('../../utils/findFontFamily');
+const keywordSets = require('../../reference/keywordSets');
+const optionsMatches = require('../../utils/optionsMatches');
+const report = require('../../utils/report');
+const ruleMessages = require('../../utils/ruleMessages');
+const validateOptions = require('../../utils/validateOptions');
+
+const ruleName = 'font-family-no-duplicate-names';
+
+const messages = ruleMessages(ruleName, {
+	rejected: (name) => `Unexpected duplicate name ${name}`,
+});
+
+const isFamilyNameKeyword = (node) =>
+	!node.quote && keywordSets.fontFamilyKeywords.has(node.value.toLowerCase());
+
+function rule(actual, options) {
+	return (root, result) => {
+		const validOptions = validateOptions(
+			result,
+			ruleName,
+			{ actual },
+			{
+				actual: options,
+				possible: {
+					ignoreFontFamilyNames: [_.isString, _.isRegExp],
+				},
+				optional: true,
+			},
+		);
+
+		if (!validOptions) {
+			return;
+		}
+
+		root.walkDecls(/^font(-family)?$/i, (decl) => {
+			const keywords = new Set();
+			const familyNames = new Set();
+
+			const fontFamilies = findFontFamily(decl.value);
+
+			if (fontFamilies.length === 0) {
+				return;
+			}
+
+			fontFamilies.forEach((fontFamilyNode) => {
+				const family = fontFamilyNode.value.trim();
+
+				if (optionsMatches(options, 'ignoreFontFamilyNames', fontFamilyNode.value.trim())) {
+					return;
+				}
+
+				if (isFamilyNameKeyword(fontFamilyNode)) {
+					if (keywords.has(family.toLowerCase())) {
+						complain(
+							messages.rejected(family),
+							declarationValueIndex(decl) + fontFamilyNode.sourceIndex,
+							decl,
+						);
+
+						return;
+					}
+
+					keywords.add(family);
+
+					return;
+				}
+
+				if (familyNames.has(family)) {
+					complain(
+						messages.rejected(family),
+						declarationValueIndex(decl) + fontFamilyNode.sourceIndex,
+						decl,
+					);
+
+					return;
+				}
+
+				familyNames.add(family);
+			});
+		});
+
+		function complain(message, index, decl) {
+			report({
+				result,
+				ruleName,
+				message,
+				node: decl,
+				index,
+			});
+		}
+	};
+}
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+module.exports = rule;