feat: init

node_modules/regexp-tree/dist/optimizer/transforms/char-class-remove-duplicates-transform.js

@@ -0,0 +1,33 @@
+/**
+ * The MIT License (MIT)
+ * Copyright (c) 2017-present Dmitry Soshnikov <dmitry.soshnikov@gmail.com>
+ */
+
+'use strict';
+
+/**
+ * A regexp-tree plugin to remove duplicates from character classes.
+ */
+
+module.exports = {
+  CharacterClass: function CharacterClass(path) {
+    var node = path.node;
+
+    var sources = {};
+
+    for (var i = 0; i < node.expressions.length; i++) {
+      var childPath = path.getChild(i);
+      var source = childPath.jsonEncode();
+
+      if (sources.hasOwnProperty(source)) {
+        childPath.remove();
+
+        // Since we remove the current node.
+        // TODO: make it simpler for users with a method.
+        i--;
+      }
+
+      sources[source] = true;
+    }
+  }
+};