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

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+# function-whitelist
+
+Specify a whitelist of allowed functions
+
+```css
+a { transform: scale(1); }
+/**            ↑
+ * These functions */
+```
+
+## Options
+
+`array|string`: `["array", "of", "unprefixed", "functions" or "regex"]|"function"|"/regex/"`
+
+If a string is surrounded with `"/"` (e.g. `"/^rgb/"`), it is interpreted as a regular expression.
+
+Given:
+
+```js
+["scale", "rgba", "linear-gradient"]
+```
+
+The following patterns are considered warnings:
+
+```css
+a { transform: rotate(1); }
+```
+
+```css
+a {
+  color: hsla(170, 50%, 45%, 1)
+}
+```
+
+```css
+a {
+  background:
+    red,
+    -webkit-radial-gradient(red, green, blue);
+}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a { background: red; }
+```
+
+```css
+a { transform: scale(1); }
+```
+
+```css
+a {
+  color: rgba(0, 0, 0, 0.5);
+}
+```
+
+```css
+a {
+  background:
+    red,
+    -moz-linear-gradient(45deg, blue, red);
+}
+```

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

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+"use strict"
+
+const declarationValueIndex = require("../../utils/declarationValueIndex")
+const isStandardSyntaxFunction = require("../../utils/isStandardSyntaxFunction")
+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 = "function-whitelist"
+
+const messages = ruleMessages(ruleName, {
+  rejected: name => `Unexpected function "${name}"`,
+})
+
+const rule = function (whitelistInput) {
+  const whitelist = [].concat(whitelistInput)
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, {
+      actual: whitelist,
+      possible: [_.isString],
+    })
+    if (!validOptions) {
+      return
+    }
+    root.walkDecls(decl => {
+      const value = decl.value
+
+      valueParser(value).walk(function (node) {
+        if (node.type !== "function") {
+          return
+        }
+        if (!isStandardSyntaxFunction(node)) {
+          return
+        }
+        if (matchesStringOrRegExp(postcss.vendor.unprefixed(node.value).toLowerCase(), whitelist)) {
+          return
+        }
+        report({
+          message: messages.rejected(node.value),
+          node: decl,
+          index: declarationValueIndex(decl) + node.sourceIndex,
+          result,
+          ruleName,
+        })
+      })
+    })
+  }
+}
+
+rule.primaryOptionArray = true
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule