From 6d13e6b259729feda8618e6d47e590e4a29e9b0b Mon Sep 17 00:00:00 2001
From: Oleh Kuchuk <qualityfurniture@mail.ua>
Date: Wed, 1 Mar 2017 17:03:08 +0200
Subject: [PATCH] Minor optimization for handling blacklisted names (#446)

---
 .../src/index.js                               | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/packages/babel-plugin-minify-mangle-names/src/index.js b/packages/babel-plugin-minify-mangle-names/src/index.js
index 1eb62d322..b900ed991 100644
--- a/packages/babel-plugin-minify-mangle-names/src/index.js
+++ b/packages/babel-plugin-minify-mangle-names/src/index.js
@@ -21,7 +21,7 @@ module.exports = ({ types: t, traverse }) => {
     } = {}) {
       this.charset = charset;
       this.program = program;
-      this.blacklist = blacklist;
+      this.blacklist = toObject(blacklist);
       this.keepFnName = keepFnName;
       this.keepClassName = keepClassName;
       this.eval = _eval;
@@ -46,9 +46,6 @@ module.exports = ({ types: t, traverse }) => {
     }
 
     isBlacklist(name) {
-      if (Array.isArray(this.blacklist)) {
-        return this.blacklist.indexOf(name) !== -1;
-      }
       return hop.call(this.blacklist, name) && this.blacklist[name];
     }
 
@@ -311,6 +308,19 @@ class Charset {
   }
 }
 
+// convert value to object
+function toObject(value) {
+  if (!Array.isArray(value)) {
+    return value;
+  }
+
+  const map = {};
+  for (let i = 0; i < value.length; i++) {
+    map[value[i]] = true;
+  }
+  return map;
+}
+
 // for keepFnName
 function isFunction(path) {
   return path.isFunctionExpression()