add some packages

node_modules/babel-plugin-minify-mangle-names/lib/counted-set.js

@@ -0,0 +1,37 @@
+"use strict";
+
+// Set that counts
+module.exports = class CountedSet {
+  constructor() {
+    // because you can't simply extend Builtins yet
+    this.map = new Map();
+  }
+
+  keys() {
+    return [...this.map.keys()];
+  }
+
+  has(value) {
+    return this.map.has(value);
+  }
+
+  add(value) {
+    if (!this.has(value)) {
+      this.map.set(value, 0);
+    }
+
+    this.map.set(value, this.map.get(value) + 1);
+  }
+
+  delete(value) {
+    if (!this.has(value)) return;
+    const count = this.map.get(value);
+
+    if (count <= 1) {
+      this.map.delete(value);
+    } else {
+      this.map.set(value, count - 1);
+    }
+  }
+
+};