--- /dev/null
+"use strict";
+
+const _ = require("lodash");
+const declarationValueIndex = require("../../utils/declarationValueIndex");
+const getUnitFromValueNode = require("../../utils/getUnitFromValueNode");
+const matchesStringOrRegExp = require("../../utils/matchesStringOrRegExp");
+const postcss = require("postcss");
+const report = require("../../utils/report");
+const ruleMessages = require("../../utils/ruleMessages");
+const validateOptions = require("../../utils/validateOptions");
+const valueParser = require("postcss-value-parser");
+
+const ruleName = "declaration-property-unit-blacklist";
+
+const messages = ruleMessages(ruleName, {
+ rejected: (property, unit) =>
+ `Unexpected unit "${unit}" for property "${property}"`
+});
+
+const rule = function(blacklist) {
+ return (root, result) => {
+ const validOptions = validateOptions(result, ruleName, {
+ actual: blacklist,
+ possible: [_.isObject]
+ });
+ if (!validOptions) {
+ return;
+ }
+
+ root.walkDecls(decl => {
+ const prop = decl.prop,
+ value = decl.value;
+
+ const unprefixedProp = postcss.vendor.unprefixed(prop);
+
+ const propBlacklist = _.find(blacklist, (list, propIdentifier) =>
+ matchesStringOrRegExp(unprefixedProp, propIdentifier)
+ );
+
+ if (!propBlacklist) {
+ 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 && propBlacklist.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;