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node_modules/stylelint/lib/rules/keyframe-block-no-duplicate-selectors/index.mjs

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+import getRuleSelector from '../../utils/getRuleSelector.mjs';
+import getStrippedSelectorSource from '../../utils/getStrippedSelectorSource.mjs';
+import isStandardSyntaxRule from '../../utils/isStandardSyntaxRule.mjs';
+import parseSelector from '../../utils/parseSelector.mjs';
+import report from '../../utils/report.mjs';
+import ruleMessages from '../../utils/ruleMessages.mjs';
+import validateOptions from '../../utils/validateOptions.mjs';
+
+const ruleName = 'keyframe-block-no-duplicate-selectors';
+
+const messages = ruleMessages(ruleName, {
+	rejected: (selector) => `Unexpected duplicate "${selector}"`,
+});
+
+const meta = {
+	url: 'https://stylelint.io/user-guide/rules/keyframe-block-no-duplicate-selectors',
+};
+
+/** @type {import('stylelint').CoreRules[ruleName]} */
+const rule = (primary) => {
+	return (root, result) => {
+		const validOptions = validateOptions(result, ruleName, { actual: primary });
+
+		if (!validOptions) {
+			return;
+		}
+
+		root.walkAtRules(/^(-(o|moz|ms|webkit)-)?keyframes$/i, (atRuleKeyframes) => {
+			const selectors = new Set();
+
+			atRuleKeyframes.walkRules((keyframeRule) => {
+				if (!isStandardSyntaxRule(keyframeRule)) {
+					return;
+				}
+
+				parseSelector(getRuleSelector(keyframeRule), result, keyframeRule)?.each((selector) => {
+					const { selector: selectorStr, index, endIndex } = getStrippedSelectorSource(selector);
+
+					const normalizedSelector = selectorStr.toLowerCase();
+
+					const isDuplicate = selectors.has(normalizedSelector);
+
+					if (isDuplicate) {
+						report({
+							message: messages.rejected,
+							messageArgs: [selectorStr],
+							node: keyframeRule,
+							result,
+							ruleName,
+							index,
+							endIndex,
+						});
+
+						return;
+					}
+
+					selectors.add(normalizedSelector);
+				});
+			});
+		});
+	};
+};
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+rule.meta = meta;
+export default rule;