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node_modules/stylelint/lib/rules/unit-whitelist/README.md

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+# unit-whitelist
+
+Specify a whitelist of allowed units.
+
+```css
+a { width: 100px; }
+/**           ↑
+ *  These units */
+```
+
+## Options
+
+`array|string`: `["array", "of", "units"]|"unit"`
+
+Given:
+
+```js
+["px", "em", "deg"]
+```
+
+The following patterns are considered warnings:
+
+```css
+a { width: 100%; }
+```
+
+```css
+a { font-size: 10rem; }
+```
+
+```css
+a { animation: animation-name 5s ease; }
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a { font-size: 1.2em; }
+```
+
+```css
+a { line-height: 1.2; }
+```
+
+```css
+a { height: 100px; }
+```
+
+```css
+a { height: 100PX; }
+```
+
+```css
+a { transform: rotate(30deg); }
+```
+
+## Optional secondary options
+
+### `ignoreProperties: { unit: ["property", "/regex/"] }`
+
+Ignore units in the values of declarations with the specified properties.
+
+For example, with `["px", "em"]`.
+
+Given:
+
+```js
+{
+  "rem": [ "line-height", "/^border/" ],
+  "%": [ "width" ]  
+}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a { line-height: 0.1rem; }
+```
+
+```css
+a { border-bottom-width: 6rem; }
+```
+
+```css
+a { width: 100%; }
+```
+
+The following patterns are considered warnings:
+
+```css
+a { margin: 0 20rem; }
+```
+
+```css
+a { -moz-border-radius-topright: 20rem; }
+```
+
+```css
+a { height: 100%; }
+```

node_modules/stylelint/lib/rules/unit-whitelist/index.js

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+"use strict"
+
+const atRuleParamIndex = require("../../utils/atRuleParamIndex")
+const declarationValueIndex = require("../../utils/declarationValueIndex")
+const getUnitFromValueNode = require("../../utils/getUnitFromValueNode")
+const optionsMatches = require("../../utils/optionsMatches")
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+const _ = require("lodash")
+const validateObjectWithStringArrayProps = require("../../utils/validateObjectWithStringArrayProps")
+const valueParser = require("postcss-value-parser")
+
+const ruleName = "unit-whitelist"
+
+const messages = ruleMessages(ruleName, {
+  rejected: unit => `Unexpected unit "${unit}"`,
+})
+
+const rule = function (whitelistInput, options) {
+  const whitelist = [].concat(whitelistInput)
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, {
+      actual: whitelist,
+      possible: [_.isString],
+    }, {
+      optional: true,
+      actual: options,
+      possible: {
+        ignoreProperties: validateObjectWithStringArrayProps,
+      },
+    })
+    if (!validOptions) {
+      return
+    }
+
+    function check(node, value, getIndex) {
+      valueParser(value).walk(function (valueNode) {
+        // Ignore wrong units within `url` function
+        if (valueNode.type === "function" && valueNode.value.toLowerCase() === "url") {
+          return false
+        }
+
+        const unit = getUnitFromValueNode(valueNode)
+
+        if (!unit || unit && whitelist.indexOf(unit.toLowerCase()) !== -1) {
+          return
+        }
+
+        if (options && optionsMatches(options["ignoreProperties"], unit.toLowerCase(), node.prop)) {
+          return
+        }
+
+        report({
+          index: getIndex(node) + valueNode.sourceIndex,
+          message: messages.rejected(unit),
+          node,
+          result,
+          ruleName,
+        })
+      })
+    }
+
+    root.walkAtRules(/^media$/i, atRule => check(atRule, atRule.params, atRuleParamIndex))
+    root.walkDecls(decl => check(decl, decl.value, declarationValueIndex))
+  }
+}
+
+rule.primaryOptionArray = true
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule