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

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+# declaration-property-unit-whitelist
+
+Specify a whitelist of allowed property and unit pairs within declarations.
+
+```css
+a { width: 100px; }
+/** ↑         ↑
+ * These properties and these units */
+```
+
+## Options
+
+`object`: `{
+  "unprefixed-property-name": ["array", "of", "units"]
+}`
+
+If a property name is surrounded with `"/"` (e.g. `"/^animation/"`), it is interpreted as a regular expression. This allows, for example, easy targeting of shorthands: `/^animation/` will match `animation`, `animation-duration`, `animation-timing-function`, etc.
+
+Given:
+
+```js
+{
+  "font-size": ["em", "px"],
+  "/^animation/": ["s"],
+  "line-height": []
+}
+```
+
+The following patterns are considered warnings:
+
+```css
+a { font-size: 1.2rem; }
+```
+
+```css
+a { animation: animation-name 500ms ease; }
+```
+
+```css
+a { -webkit-animation: animation-name 500ms ease; }
+```
+
+```css
+a { animation-duration: 500ms; }
+```
+
+```css
+a { line-height: 13px; }
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a { font-size: 1em; }
+```
+
+```css
+a { height: 100px; }
+```
+
+```css
+a { animation: animation-name 5s ease; }
+```
+
+```css
+a { -webkit-animation: animation-name 5s ease; }
+```
+
+```css
+a { animation-duration: 5s; }
+```
+
+```css
+a { line-height: 1; }
+```

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

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+"use strict"
+
+const declarationValueIndex = require("../../utils/declarationValueIndex")
+const getUnitFromValueNode = require("../../utils/getUnitFromValueNode")
+const matchesStringOrRegExp = require("../../utils/matchesStringOrRegExp")
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+const _ = require("lodash")
+const valueParser = require("postcss-value-parser")
+const postcss = require("postcss")
+
+const ruleName = "declaration-property-unit-whitelist"
+
+const messages = ruleMessages(ruleName, {
+  rejected: (property, unit) => `Unexpected unit "${unit}" for property "${property}"`,
+})
+
+const rule = function (whitelist) {
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, {
+      actual: whitelist,
+      possible: [_.isObject],
+    })
+    if (!validOptions) {
+      return
+    }
+
+    root.walkDecls(decl => {
+      const prop = decl.prop,
+        value = decl.value
+
+      const unprefixedProp = postcss.vendor.unprefixed(prop)
+
+      const propWhitelist = _.find(whitelist, (list, propIdentifier) => matchesStringOrRegExp(unprefixedProp, propIdentifier))
+
+      if (!propWhitelist) {
+        return
+      }
+
+      valueParser(value).walk(function (node) {
+        // Ignore wrong units within `url` function
+        if (node.type === "function" && node.value.toLowerCase() === "url") {
+          return false
+        }
+        if (node.type === "string") {
+          return
+        }
+
+        const unit = getUnitFromValueNode(node)
+
+        if (!unit || (unit && propWhitelist.indexOf(unit.toLowerCase())) !== -1) {
+          return
+        }
+
+        report({
+          message: messages.rejected(prop, unit),
+          node: decl,
+          index: declarationValueIndex(decl) + node.sourceIndex,
+          result,
+          ruleName,
+        })
+      })
+    })
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule