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

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+# unit-no-unknown
+
+Disallow unknown units.
+
+```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 warnings:
+
+```css
+a {
+  width: 10pixels;
+}
+```
+
+```css
+a {
+  width: calc(10px + 10pixels);
+}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a {
+  width: 10px;
+}  
+```
+
+```css
+a {
+  width: 10Px;
+}  
+```
+
+```css
+a {
+  width: 10pX;
+}  
+```
+
+```css
+a {
+  width: calc(10px + 10px);
+}
+```
+
+## Optional secondary options
+
+### `ignoreUnits: ["/regex/", "string"]`
+
+Given:
+
+```js
+["/^my-/", "custom"]
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a {
+  width: 10custom;
+}
+```
+
+```css
+a {
+  width: 10my-unit;
+}
+```
+
+```css
+a {
+  width: 10my-other-unit;
+}
+```

node_modules/stylelint/lib/rules/unit-no-unknown/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 keywordSets = require("../../reference/keywordSets")
+const valueParser = require("postcss-value-parser")
+
+const ruleName = "unit-no-unknown"
+
+const messages = ruleMessages(ruleName, {
+  rejected: unit => `Unexpected unknown unit "${unit}"`,
+})
+
+const rule = function (actual, options) {
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, { actual }, {
+      actual: options,
+      possible: {
+        ignoreUnits: [_.isString],
+      },
+      optional: true,
+    })
+
+    if (!validOptions) {
+      return
+    }
+
+    function check(node, value, getIndex) {
+      valueParser(value).walk(function (valueNode) {
+        // Ignore wrong units within `url` function
+        if (valueNode.type === "function" && valueNode.value.toLowerCase() === "url") {
+          return false
+        }
+
+        const unit = getUnitFromValueNode(valueNode)
+        if (!unit) {
+          return
+        }
+
+        if (optionsMatches(options, "ignoreUnits", unit)) {
+          return
+        }
+
+        if (keywordSets.units.has(unit.toLowerCase())) {
+          return
+        }
+
+        report({
+          index: getIndex(node) + valueNode.sourceIndex,
+          message: messages.rejected(unit),
+          node,
+          result,
+          ruleName,
+        })
+      })
+    }
+
+    root.walkAtRules(/^media$/i, atRule => check(atRule, atRule.params, atRuleParamIndex))
+    root.walkDecls(decl => check(decl, decl.value, declarationValueIndex))
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule