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node_modules/clean-css/lib/optimizer/level-1/value-optimizers/url-whitespace.js

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+var startsAsUrl = require('./starts-as-url');
+
+var WHITESPACE_PATTERN = /\\?\n|\\?\r\n/g;
+var WHITESPACE_PREFIX_PATTERN = /(\()\s+/g;
+var WHITESPACE_SUFFIX_PATTERN = /\s+(\))/g;
+
+var plugin = {
+  level1: {
+    value: function urlWhitespace(_name, value) {
+      if (!startsAsUrl(value)) {
+        return value;
+      }
+
+      return value
+        .replace(WHITESPACE_PATTERN, '')
+        .replace(WHITESPACE_PREFIX_PATTERN, '$1')
+        .replace(WHITESPACE_SUFFIX_PATTERN, '$1');
+    }
+  }
+};
+
+module.exports = plugin;