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

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+# declaration-block-no-duplicate-properties
+
+Disallow duplicate properties within declaration blocks.
+
+<!-- prettier-ignore -->
+```css
+a { color: pink; color: orange; }
+/** ↑            ↑
+ * These duplicated properties */
+```
+
+This rule ignores variables (`$sass`, `@less`, `--custom-property`).
+
+## Options
+
+### `true`
+
+The following patterns are considered violations:
+
+<!-- prettier-ignore -->
+```css
+a { color: pink; color: orange; }
+```
+
+<!-- prettier-ignore -->
+```css
+a { color: pink; background: orange; color: orange }
+```
+
+The following patterns are _not_ considered violations:
+
+<!-- prettier-ignore -->
+```css
+a { color: pink; }
+```
+
+<!-- prettier-ignore -->
+```css
+a { color: pink; background: orange; }
+```
+
+## Optional secondary options
+
+### `ignore: ["consecutive-duplicates"]`
+
+Ignore consecutive duplicated properties.
+
+They can prove to be useful fallbacks for older browsers.
+
+The following patterns are considered violations:
+
+<!-- prettier-ignore -->
+```css
+p {
+  font-size: 16px;
+  font-weight: 400;
+  font-size: 1rem;
+}
+```
+
+The following patterns are _not_ considered violations:
+
+<!-- prettier-ignore -->
+```css
+p {
+  font-size: 16px;
+  font-size: 1rem;
+  font-weight: 400;
+}
+```
+
+### `ignore: ["consecutive-duplicates-with-different-values"]`
+
+Ignore consecutive duplicated properties with different values.
+
+Including duplicate properties (fallbacks) is useful to deal with older browsers support for CSS properties. E.g. using `px` units when `rem` isn't available.
+
+The following patterns are considered violations:
+
+<!-- prettier-ignore -->
+```css
+/* properties with the same value */
+p {
+  font-size: 16px;
+  font-size: 16px;
+  font-weight: 400;
+}
+```
+
+<!-- prettier-ignore -->
+```css
+/* nonconsecutive duplicates */
+p {
+  font-size: 16px;
+  font-weight: 400;
+  font-size: 1rem;
+}
+```
+
+The following patterns are _not_ considered violations:
+
+<!-- prettier-ignore -->
+```css
+p {
+  font-size: 16px;
+  font-size: 1rem;
+  font-weight: 400;
+}
+```
+
+### `ignoreProperties: ["/regex/", "non-regex"]`
+
+Ignore duplicates of specific properties.
+
+Given:
+
+```
+["color", "/background-/"]
+```
+
+The following patterns are considered violations:
+
+<!-- prettier-ignore -->
+```css
+a { color: pink; background: orange; background: white; }
+```
+
+<!-- prettier-ignore -->
+```css
+a { background: orange; color: pink; background: white; }
+```
+
+The following patterns are _not_ considered violations:
+
+<!-- prettier-ignore -->
+```css
+a { color: pink; color: orange; background-color: orange; background-color: white; }
+```
+
+<!-- prettier-ignore -->
+```css
+a { color: pink; background-color: orange; color: orange; background-color: white; }
+```

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

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+// @ts-nocheck
+
+'use strict';
+
+const _ = require('lodash');
+const eachDeclarationBlock = require('../../utils/eachDeclarationBlock');
+const isCustomProperty = require('../../utils/isCustomProperty');
+const isStandardSyntaxProperty = require('../../utils/isStandardSyntaxProperty');
+const optionsMatches = require('../../utils/optionsMatches');
+const report = require('../../utils/report');
+const ruleMessages = require('../../utils/ruleMessages');
+const validateOptions = require('../../utils/validateOptions');
+
+const ruleName = 'declaration-block-no-duplicate-properties';
+
+const messages = ruleMessages(ruleName, {
+	rejected: (property) => `Unexpected duplicate "${property}"`,
+});
+
+function rule(on, options) {
+	return (root, result) => {
+		const validOptions = validateOptions(
+			result,
+			ruleName,
+			{ actual: on },
+			{
+				actual: options,
+				possible: {
+					ignore: ['consecutive-duplicates', 'consecutive-duplicates-with-different-values'],
+					ignoreProperties: [_.isString],
+				},
+				optional: true,
+			},
+		);
+
+		if (!validOptions) {
+			return;
+		}
+
+		eachDeclarationBlock(root, (eachDecl) => {
+			const decls = [];
+			const values = [];
+
+			eachDecl((decl) => {
+				const prop = decl.prop;
+				const value = decl.value;
+
+				if (!isStandardSyntaxProperty(prop)) {
+					return;
+				}
+
+				if (isCustomProperty(prop)) {
+					return;
+				}
+
+				// Return early if the property is to be ignored
+				if (optionsMatches(options, 'ignoreProperties', prop)) {
+					return;
+				}
+
+				// Ignore the src property as commonly duplicated in at-fontface
+				if (prop.toLowerCase() === 'src') {
+					return;
+				}
+
+				const indexDuplicate = decls.indexOf(prop.toLowerCase());
+
+				if (indexDuplicate !== -1) {
+					if (optionsMatches(options, 'ignore', 'consecutive-duplicates-with-different-values')) {
+						// if duplicates are not consecutive
+						if (indexDuplicate !== decls.length - 1) {
+							report({
+								message: messages.rejected(prop),
+								node: decl,
+								result,
+								ruleName,
+							});
+
+							return;
+						}
+
+						// if values of consecutive duplicates are equal
+						if (value === values[indexDuplicate]) {
+							report({
+								message: messages.rejected(value),
+								node: decl,
+								result,
+								ruleName,
+							});
+
+							return;
+						}
+
+						return;
+					}
+
+					if (
+						optionsMatches(options, 'ignore', 'consecutive-duplicates') &&
+						indexDuplicate === decls.length - 1
+					) {
+						return;
+					}
+
+					report({
+						message: messages.rejected(prop),
+						node: decl,
+						result,
+						ruleName,
+					});
+				}
+
+				decls.push(prop.toLowerCase());
+				values.push(value.toLowerCase());
+			});
+		});
+	};
+}
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+module.exports = rule;