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node_modules/stylelint/lib/rules/no-unknown-custom-properties/index.cjs

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+// NOTICE: This file is generated by Rollup. To modify it,
+// please instead edit the ESM counterpart and rebuild with Rollup (npm run build).
+'use strict';
+
+const valueParser = require('postcss-value-parser');
+const nodeFieldIndices = require('../../utils/nodeFieldIndices.cjs');
+const isVarFunction = require('../../utils/isVarFunction.cjs');
+const report = require('../../utils/report.cjs');
+const ruleMessages = require('../../utils/ruleMessages.cjs');
+const validateOptions = require('../../utils/validateOptions.cjs');
+
+const ruleName = 'no-unknown-custom-properties';
+
+const messages = ruleMessages(ruleName, {
+	rejected: (propName) => `Unexpected unknown custom property "${propName}"`,
+});
+
+const meta = {
+	url: 'https://stylelint.io/user-guide/rules/no-unknown-custom-properties',
+};
+
+/** @type {import('stylelint').CoreRules[ruleName]} */
+const rule = (primary) => {
+	return (root, result) => {
+		const validOptions = validateOptions(result, ruleName, { actual: primary });
+
+		if (!validOptions) return;
+
+		/** @type {Set<string>} */
+		const declaredCustomProps = new Set();
+
+		root.walkAtRules(/^property$/i, ({ params }) => {
+			declaredCustomProps.add(params);
+		});
+
+		root.walkDecls(/^--/, ({ prop }) => {
+			declaredCustomProps.add(prop);
+		});
+
+		root.walkDecls((decl) => {
+			const { value } = decl;
+
+			const parsedValue = valueParser(value);
+
+			parsedValue.walk((node) => {
+				if (!isVarFunction(node)) return;
+
+				const [firstNode, secondNode] = node.nodes;
+
+				if (!firstNode || declaredCustomProps.has(firstNode.value)) return;
+
+				// Second node (div) indicates fallback exists in all cases
+				if (secondNode && secondNode.type === 'div') return;
+
+				const startIndex = nodeFieldIndices.declarationValueIndex(decl);
+
+				report({
+					result,
+					ruleName,
+					message: messages.rejected,
+					messageArgs: [firstNode.value],
+					node: decl,
+					index: startIndex + firstNode.sourceIndex,
+					endIndex: startIndex + firstNode.sourceEndIndex,
+				});
+			});
+		});
+	};
+};
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+rule.meta = meta;
+
+module.exports = rule;

node_modules/stylelint/lib/rules/no-unknown-custom-properties/index.mjs

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+import valueParser from 'postcss-value-parser';
+
+import { declarationValueIndex } from '../../utils/nodeFieldIndices.mjs';
+import isVarFunction from '../../utils/isVarFunction.mjs';
+import report from '../../utils/report.mjs';
+import ruleMessages from '../../utils/ruleMessages.mjs';
+import validateOptions from '../../utils/validateOptions.mjs';
+
+const ruleName = 'no-unknown-custom-properties';
+
+const messages = ruleMessages(ruleName, {
+	rejected: (propName) => `Unexpected unknown custom property "${propName}"`,
+});
+
+const meta = {
+	url: 'https://stylelint.io/user-guide/rules/no-unknown-custom-properties',
+};
+
+/** @type {import('stylelint').CoreRules[ruleName]} */
+const rule = (primary) => {
+	return (root, result) => {
+		const validOptions = validateOptions(result, ruleName, { actual: primary });
+
+		if (!validOptions) return;
+
+		/** @type {Set<string>} */
+		const declaredCustomProps = new Set();
+
+		root.walkAtRules(/^property$/i, ({ params }) => {
+			declaredCustomProps.add(params);
+		});
+
+		root.walkDecls(/^--/, ({ prop }) => {
+			declaredCustomProps.add(prop);
+		});
+
+		root.walkDecls((decl) => {
+			const { value } = decl;
+
+			const parsedValue = valueParser(value);
+
+			parsedValue.walk((node) => {
+				if (!isVarFunction(node)) return;
+
+				const [firstNode, secondNode] = node.nodes;
+
+				if (!firstNode || declaredCustomProps.has(firstNode.value)) return;
+
+				// Second node (div) indicates fallback exists in all cases
+				if (secondNode && secondNode.type === 'div') return;
+
+				const startIndex = declarationValueIndex(decl);
+
+				report({
+					result,
+					ruleName,
+					message: messages.rejected,
+					messageArgs: [firstNode.value],
+					node: decl,
+					index: startIndex + firstNode.sourceIndex,
+					endIndex: startIndex + firstNode.sourceEndIndex,
+				});
+			});
+		});
+	};
+};
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+rule.meta = meta;
+export default rule;