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node_modules/stylelint/lib/rules/no-duplicate-selectors/README.md

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+# no-duplicate-selectors
+
+Disallow duplicate selectors within a stylesheet.
+
+<!-- prettier-ignore -->
+```css
+    .foo {} .bar {} .foo {}
+/** ↑              ↑
+ * These duplicates */
+```
+
+This rule checks for two types of duplication:
+
+- Duplication of a single selector with a rule's selector list, e.g. `a, b, a {}`.
+- Duplication of a selector list within a stylesheet, e.g. `a, b {} a, b {}`. Duplicates are found even if the selectors come in different orders or have different spacing, e.g. `a d, b > c {} b>c, a d {}`.
+
+The same selector _is_ allowed to repeat in the following circumstances:
+
+- It is used in different selector lists, e.g. `a {} a, b {}`.
+- The duplicates are determined to originate in different stylesheets, e.g. you have concatenated or compiled files in a way that produces sourcemaps for PostCSS to read, e.g. postcss-import.
+- The duplicates are in rules with different parent nodes, e.g. inside and outside of a media query.
+
+This rule resolves nested selectors. So `a b {} a { & b {} }` counts as a violation, because the resolved selectors end up with a duplicate.
+
+## Options
+
+### `true`
+
+The following patterns are considered violations:
+
+<!-- prettier-ignore -->
+```css
+.foo,
+.bar,
+.foo {}
+```
+
+<!-- prettier-ignore -->
+```css
+.foo {}
+.bar {}
+.foo {}
+```
+
+<!-- prettier-ignore -->
+```css
+.foo .bar {}
+.bar {}
+.foo .bar {}
+```
+
+<!-- prettier-ignore -->
+```css
+@media (min-width: 10px) {
+  .foo {}
+  .foo {}
+}
+```
+
+<!-- prettier-ignore -->
+```css
+.foo, .bar {}
+.bar, .foo {}
+```
+
+<!-- prettier-ignore -->
+```css
+a .foo, b + .bar {}
+b+.bar,
+a
+  .foo {}
+```
+
+<!-- prettier-ignore -->
+```css
+a b {}
+a {
+  & b {}
+}
+```
+
+The following patterns are _not_ considered violations:
+
+<!-- prettier-ignore -->
+```css
+.foo {}
+@media (min-width: 10px) {
+  .foo {}
+}
+```
+
+<!-- prettier-ignore -->
+```css
+.foo {
+  .foo {}
+}
+```
+
+<!-- prettier-ignore -->
+```css
+.foo {}
+.bar {}
+.foo .bar {}
+.bar .foo {}
+```
+
+<!-- prettier-ignore -->
+```css
+a b {}
+a {
+  & b,
+  & c {}
+}
+```
+
+## Optional secondary options
+
+### `disallowInList: true | false` (default: `false`)
+
+This option will also disallow duplicate selectors within selector lists.
+
+For example, with `true`.
+
+The following patterns are considered violations:
+
+<!-- prettier-ignore -->
+```css
+input, textarea {
+  border: 2px;
+}
+
+textarea {
+  border: 1px;
+}
+
+```

node_modules/stylelint/lib/rules/no-duplicate-selectors/index.js

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+// @ts-nocheck
+
+'use strict';
+
+const _ = require('lodash');
+const findAtRuleContext = require('../../utils/findAtRuleContext');
+const isKeyframeRule = require('../../utils/isKeyframeRule');
+const nodeContextLookup = require('../../utils/nodeContextLookup');
+const normalizeSelector = require('normalize-selector');
+const parseSelector = require('../../utils/parseSelector');
+const report = require('../../utils/report');
+const resolvedNestedSelector = require('postcss-resolve-nested-selector');
+const ruleMessages = require('../../utils/ruleMessages');
+const validateOptions = require('../../utils/validateOptions');
+
+const ruleName = 'no-duplicate-selectors';
+
+const messages = ruleMessages(ruleName, {
+	rejected: (selector, firstDuplicateLine) =>
+		`Unexpected duplicate selector "${selector}", first used at line ${firstDuplicateLine}`,
+});
+
+function rule(actual, options) {
+	return (root, result) => {
+		const validOptions = validateOptions(
+			result,
+			ruleName,
+			{ actual },
+			{
+				actual: options,
+				possible: {
+					disallowInList: _.isBoolean,
+				},
+				optional: true,
+			},
+		);
+
+		if (!validOptions) {
+			return;
+		}
+
+		const shouldDisallowDuplicateInList = _.get(options, 'disallowInList');
+
+		// The top level of this map will be rule sources.
+		// Each source maps to another map, which maps rule parents to a set of selectors.
+		// This ensures that selectors are only checked against selectors
+		// from other rules that share the same parent and the same source.
+		const selectorContextLookup = nodeContextLookup();
+
+		root.walkRules((ruleNode) => {
+			if (isKeyframeRule(ruleNode)) {
+				return;
+			}
+
+			const contextSelectorSet = selectorContextLookup.getContext(
+				ruleNode,
+				findAtRuleContext(ruleNode),
+			);
+			const resolvedSelectors = ruleNode.selectors.reduce((selectors, selector) => {
+				return _.union(selectors, resolvedNestedSelector(selector, ruleNode));
+			}, []);
+
+			const normalizedSelectorList = resolvedSelectors.map(normalizeSelector);
+
+			// Sort the selectors list so that the order of the constituents
+			// doesn't matter
+			const sortedSelectorList = normalizedSelectorList.slice().sort().join(',');
+
+			const selectorLine = ruleNode.source.start.line;
+
+			// Complain if the same selector list occurs twice
+
+			let previousDuplicatePosition;
+			// When `disallowInList` is true, we must parse `sortedSelectorList` into
+			// list items.
+			const selectorListParsed = [];
+
+			if (shouldDisallowDuplicateInList) {
+				parseSelector(sortedSelectorList, result, ruleNode, (selectors) => {
+					selectors.each((s) => {
+						const selector = String(s);
+
+						selectorListParsed.push(selector);
+
+						if (contextSelectorSet.get(selector)) {
+							previousDuplicatePosition = contextSelectorSet.get(selector);
+						}
+					});
+				});
+			} else {
+				previousDuplicatePosition = contextSelectorSet.get(sortedSelectorList);
+			}
+
+			if (previousDuplicatePosition) {
+				// If the selector isn't nested we can use its raw value; otherwise,
+				// we have to approximate something for the message -- which is close enough
+				const isNestedSelector = resolvedSelectors.join(',') !== ruleNode.selectors.join(',');
+				const selectorForMessage = isNestedSelector
+					? resolvedSelectors.join(', ')
+					: ruleNode.selector;
+
+				return report({
+					result,
+					ruleName,
+					node: ruleNode,
+					message: messages.rejected(selectorForMessage, previousDuplicatePosition),
+				});
+			}
+
+			const presentedSelectors = new Set();
+			const reportedSelectors = new Set();
+
+			// Or complain if one selector list contains the same selector more than once
+			ruleNode.selectors.forEach((selector) => {
+				const normalized = normalizeSelector(selector);
+
+				if (presentedSelectors.has(normalized)) {
+					if (reportedSelectors.has(normalized)) {
+						return;
+					}
+
+					report({
+						result,
+						ruleName,
+						node: ruleNode,
+						message: messages.rejected(selector, selectorLine),
+					});
+					reportedSelectors.add(normalized);
+				} else {
+					presentedSelectors.add(normalized);
+				}
+			});
+
+			if (shouldDisallowDuplicateInList) {
+				for (const selector of selectorListParsed) {
+					// [selectorLine] will not really be accurate for multi-line
+					// selectors, such as "bar" in "foo,\nbar {}".
+					contextSelectorSet.set(selector, selectorLine);
+				}
+			} else {
+				contextSelectorSet.set(sortedSelectorList, selectorLine);
+			}
+		});
+	};
+}
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+module.exports = rule;