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node_modules/stylelint/lib/rules/declaration-block-no-duplicate-custom-properties/README.md

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+# declaration-block-no-duplicate-custom-properties
+
+Disallow duplicate custom properties within declaration blocks.
+
+<!-- prettier-ignore -->
+```css
+a { --custom-property: pink; --custom-property: orange; }
+/** ↑                        ↑
+ * These duplicated custom properties */
+```
+
+This rule is case-sensitive.
+
+## Options
+
+### `true`
+
+The following patterns are considered violations:
+
+<!-- prettier-ignore -->
+```css
+a { --custom-property: pink; --custom-property: orange; }
+```
+
+<!-- prettier-ignore -->
+```css
+a { --custom-property: pink; background: orange; --custom-property: orange }
+```
+
+The following patterns are _not_ considered violations:
+
+<!-- prettier-ignore -->
+```css
+a { --custom-property: pink; }
+```
+
+<!-- prettier-ignore -->
+```css
+a { --custom-property: pink; --cUstOm-prOpErtY: orange; }
+```

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

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+// @ts-nocheck
+
+'use strict';
+
+const eachDeclarationBlock = require('../../utils/eachDeclarationBlock');
+const isCustomProperty = require('../../utils/isCustomProperty');
+const isStandardSyntaxProperty = require('../../utils/isStandardSyntaxProperty');
+const report = require('../../utils/report');
+const ruleMessages = require('../../utils/ruleMessages');
+const validateOptions = require('../../utils/validateOptions');
+
+const ruleName = 'declaration-block-no-duplicate-custom-properties';
+
+const messages = ruleMessages(ruleName, {
+	rejected: (property) => `Unexpected duplicate "${property}"`,
+});
+
+function rule(on) {
+	return (root, result) => {
+		const validOptions = validateOptions(result, ruleName, { actual: on });
+
+		if (!validOptions) {
+			return;
+		}
+
+		eachDeclarationBlock(root, (eachDecl) => {
+			const decls = new Set();
+
+			eachDecl((decl) => {
+				const prop = decl.prop;
+
+				if (!isStandardSyntaxProperty(prop)) {
+					return;
+				}
+
+				if (!isCustomProperty(prop)) {
+					return;
+				}
+
+				const isDuplicate = decls.has(prop);
+
+				if (isDuplicate) {
+					report({
+						message: messages.rejected(prop),
+						node: decl,
+						result,
+						ruleName,
+					});
+
+					return;
+				}
+
+				decls.add(prop);
+			});
+		});
+	};
+}
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+module.exports = rule;