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node_modules/stylelint/lib/rules/declaration-block-no-duplicate-custom-properties/index.mjs

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+import { isRegExp, isString } from '../../utils/validateTypes.mjs';
+import eachDeclarationBlock from '../../utils/eachDeclarationBlock.mjs';
+import isCustomProperty from '../../utils/isCustomProperty.mjs';
+import isStandardSyntaxProperty from '../../utils/isStandardSyntaxProperty.mjs';
+import optionsMatches from '../../utils/optionsMatches.mjs';
+import report from '../../utils/report.mjs';
+import ruleMessages from '../../utils/ruleMessages.mjs';
+import validateOptions from '../../utils/validateOptions.mjs';
+
+const ruleName = 'declaration-block-no-duplicate-custom-properties';
+
+const messages = ruleMessages(ruleName, {
+	rejected: (property) => `Unexpected duplicate "${property}"`,
+});
+
+const meta = {
+	url: 'https://stylelint.io/user-guide/rules/declaration-block-no-duplicate-custom-properties',
+};
+
+/** @type {import('stylelint').CoreRules[ruleName]} */
+const rule = (primary, secondaryOptions) => {
+	return (root, result) => {
+		const validOptions = validateOptions(
+			result,
+			ruleName,
+			{ actual: primary },
+			{
+				actual: secondaryOptions,
+				possible: {
+					ignoreProperties: [isString, isRegExp],
+				},
+				optional: true,
+			},
+		);
+
+		if (!validOptions) {
+			return;
+		}
+
+		eachDeclarationBlock(root, (eachDecl) => {
+			const decls = new Set();
+
+			eachDecl((decl) => {
+				const prop = decl.prop;
+
+				if (!isStandardSyntaxProperty(prop)) {
+					return;
+				}
+
+				if (!isCustomProperty(prop)) {
+					return;
+				}
+
+				if (optionsMatches(secondaryOptions, 'ignoreProperties', prop)) {
+					return;
+				}
+
+				const isDuplicate = decls.has(prop);
+
+				if (isDuplicate) {
+					report({
+						message: messages.rejected,
+						messageArgs: [prop],
+						node: decl,
+						result,
+						ruleName,
+						word: prop,
+					});
+
+					return;
+				}
+
+				decls.add(prop);
+			});
+		});
+	};
+};
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+rule.meta = meta;
+export default rule;