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node_modules/stylelint/lib/rules/unit-no-unknown/README.md

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+# unit-no-unknown
+
+Disallow unknown units.
+
+<!-- prettier-ignore -->
+```css
+a { width: 100pixels; }
+/**           ↑
+ *  These units */
+```
+
+This rule considers units defined in the CSS Specifications, up to and including Editor's Drafts, to be known.
+
+## Options
+
+### `true`
+
+The following patterns are considered violations:
+
+<!-- prettier-ignore -->
+```css
+a {
+  width: 10pixels;
+}
+```
+
+<!-- prettier-ignore -->
+```css
+a {
+  width: calc(10px + 10pixels);
+}
+```
+
+The following patterns are _not_ considered violations:
+
+<!-- prettier-ignore -->
+```css
+a {
+  width: 10px;
+}
+```
+
+<!-- prettier-ignore -->
+```css
+a {
+  width: 10Px;
+}
+```
+
+<!-- prettier-ignore -->
+```css
+a {
+  width: 10pX;
+}
+```
+
+<!-- prettier-ignore -->
+```css
+a {
+  width: calc(10px + 10px);
+}
+```
+
+## Optional secondary options
+
+### `ignoreUnits: ["/regex/", /regex/, "string"]`
+
+Given:
+
+```
+["/^my-/", "custom"]
+```
+
+The following patterns are _not_ considered violations:
+
+<!-- prettier-ignore -->
+```css
+width: 10custom;
+a {
+}
+```
+
+<!-- prettier-ignore -->
+```css
+a {
+  width: 10my-unit;
+}
+```
+
+<!-- prettier-ignore -->
+```css
+a {
+  width: 10my-other-unit;
+}
+```
+
+### `ignoreFunctions: ["/regex/", /regex/, "string"]`
+
+Given:
+
+```
+["image-set", "/^my-/", "/^YOUR-/i"]
+```
+
+The following patterns are _not_ considered violations:
+
+<!-- prettier-ignore -->
+```css
+a {
+  background-image: image-set(
+    '/images/some-image-1x.jpg' 1x,
+    '/images/some-image-2x.jpg' 2x,
+    '/images/some-image-3x.jpg' 3x
+  );
+}
+```
+
+<!-- prettier-ignore -->
+```css
+a {
+  background-image: my-image-set(
+    '/images/some-image-1x.jpg' 1x,
+    '/images/some-image-2x.jpg' 2x,
+    '/images/some-image-3x.jpg' 3x
+  );
+}
+```
+
+<!-- prettier-ignore -->
+```css
+a {
+  background-image: YoUr-image-set(
+    '/images/some-image-1x.jpg' 1x,
+    '/images/some-image-2x.jpg' 2x,
+    '/images/some-image-3x.jpg' 3x
+  );
+}
+```

node_modules/stylelint/lib/rules/unit-no-unknown/index.js

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+// @ts-nocheck
+
+'use strict';
+
+const _ = require('lodash');
+const atRuleParamIndex = require('../../utils/atRuleParamIndex');
+const declarationValueIndex = require('../../utils/declarationValueIndex');
+const getUnitFromValueNode = require('../../utils/getUnitFromValueNode');
+const isMap = require('../../utils/isMap');
+const keywordSets = require('../../reference/keywordSets');
+const mediaParser = require('postcss-media-query-parser').default;
+const optionsMatches = require('../../utils/optionsMatches');
+const report = require('../../utils/report');
+const ruleMessages = require('../../utils/ruleMessages');
+const validateOptions = require('../../utils/validateOptions');
+const valueParser = require('postcss-value-parser');
+const vendor = require('../../utils/vendor');
+
+const ruleName = 'unit-no-unknown';
+
+const messages = ruleMessages(ruleName, {
+	rejected: (unit) => `Unexpected unknown unit "${unit}"`,
+});
+
+// The map property name (in map cleared from comments and spaces) always
+// has index that being divided by 4 gives remainder equals 0
+const mapPropertyNameIndexOffset = 4;
+
+function rule(actual, options) {
+	return (root, result) => {
+		const validOptions = validateOptions(
+			result,
+			ruleName,
+			{ actual },
+			{
+				actual: options,
+				possible: {
+					ignoreUnits: [_.isString, _.isRegExp],
+					ignoreFunctions: [_.isString, _.isRegExp],
+				},
+				optional: true,
+			},
+		);
+
+		if (!validOptions) {
+			return;
+		}
+
+		function check(node, value, getIndex) {
+			// make sure multiplication operations (*) are divided - not handled
+			// by postcss-value-parser
+			value = value.replace(/\*/g, ',');
+			const parsedValue = valueParser(value);
+			const ignoredMapProperties = [];
+
+			parsedValue.walk((valueNode) => {
+				// Ignore wrong units within `url` function
+				// and within functions listed in the `ignoreFunctions` option
+				if (
+					valueNode.type === 'function' &&
+					(valueNode.value.toLowerCase() === 'url' ||
+						optionsMatches(options, 'ignoreFunctions', valueNode.value))
+				) {
+					return false;
+				}
+
+				if (isMap(valueNode)) {
+					valueNode.nodes.forEach(({ sourceIndex }, index) => {
+						if (!(index % mapPropertyNameIndexOffset)) {
+							ignoredMapProperties.push(sourceIndex);
+						}
+					});
+				}
+
+				if (ignoredMapProperties.includes(valueNode.sourceIndex)) {
+					return;
+				}
+
+				const unit = getUnitFromValueNode(valueNode);
+
+				if (!unit) {
+					return;
+				}
+
+				if (optionsMatches(options, 'ignoreUnits', unit)) {
+					return;
+				}
+
+				if (keywordSets.units.has(unit.toLowerCase()) && unit.toLowerCase() !== 'x') {
+					return;
+				}
+
+				if (unit.toLowerCase() === 'x') {
+					if (
+						node.type === 'atrule' &&
+						node.name === 'media' &&
+						node.params.toLowerCase().includes('resolution')
+					) {
+						let ignoreUnit = false;
+
+						mediaParser(node.params).walk((mediaNode, i, mediaNodes) => {
+							if (
+								mediaNode.value.toLowerCase().includes('resolution') &&
+								_.last(mediaNodes).sourceIndex === valueNode.sourceIndex
+							) {
+								ignoreUnit = true;
+
+								return false;
+							}
+						});
+
+						if (ignoreUnit) {
+							return;
+						}
+					}
+
+					if (node.type === 'decl') {
+						if (node.prop.toLowerCase() === 'image-resolution') {
+							return;
+						}
+
+						if (/^(?:-webkit-)?image-set[\s(]/i.test(value)) {
+							const imageSet = parsedValue.nodes.find(
+								(n) => vendor.unprefixed(n.value) === 'image-set',
+							);
+							const imageSetValueLastIndex = _.last(imageSet.nodes).sourceIndex;
+
+							if (imageSetValueLastIndex >= valueNode.sourceIndex) {
+								return;
+							}
+						}
+					}
+				}
+
+				report({
+					index: getIndex(node) + valueNode.sourceIndex,
+					message: messages.rejected(unit),
+					node,
+					result,
+					ruleName,
+				});
+			});
+		}
+
+		root.walkAtRules((atRule) => {
+			if (!/^media$/i.test(atRule.name) && !atRule.variable) {
+				return;
+			}
+
+			check(atRule, atRule.params, atRuleParamIndex);
+		});
+		root.walkDecls((decl) => check(decl, decl.value, declarationValueIndex));
+	};
+}
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+module.exports = rule;