use globals module instead of maintaining our own list

lib/6to5/traverse/global-keys.json

@@ -1,64 +0,0 @@
-[
-  "Set",
-  "Map",
-  "WeakMap",
-  "WeakSet",
-  "Proxy",
-  "Promise",
-  "Reflect",
-  "Symbol",
-  "System",
-  "__filename",
-  "__dirname",
-  "GLOBAL",
-  "global",
-  "module",
-  "require",
-  "Buffer",
-  "console",
-  "exports",
-  "process",
-  "setTimeout",
-  "clearTimeout",
-  "setInterval",
-  "clearInterval",
-  "setImmediate",
-  "clearImmediate",
-  "Array",
-  "Boolean",
-  "Date",
-  "decodeURI",
-  "decodeURIComponent",
-  "encodeURI",
-  "encodeURIComponent",
-  "Error",
-  "eval",
-  "EvalError",
-  "Function",
-  "hasOwnProperty",
-  "isFinite",
-  "isNaN",
-  "JSON",
-  "Map",
-  "Math",
-  "Number",
-  "Object",
-  "Proxy",
-  "Promise",
-  "parseInt",
-  "parseFloat",
-  "RangeError",
-  "ReferenceError",
-  "RegExp",
-  "Set",
-  "String",
-  "SyntaxError",
-  "TypeError",
-  "URIError",
-  "WeakMap",
-  "WeakSet",
-  "arguments",
-  "NaN",
-  "window",
-  "self"
-]

lib/6to5/traverse/scope.js

@@ -3,11 +3,13 @@
 module.exports = Scope;
 
 var traverse = require("./index");
+var globals  = require("globals");
 var object   = require("../helpers/object");
 var t        = require("../types");
 var each     = require("lodash/collection/each");
 var has      = require("lodash/object/has");
 var contains = require("lodash/collection/contains");
+var flatten  = require("lodash/array/flatten");
 var defaults = require("lodash/object/defaults");
 
 var FOR_KEYS = ["left", "init"];
@@ -35,7 +37,7 @@ function Scope(block, parentBlock, parent, file) {
   this.declarationKinds = info.declarationKinds;
 }
 
-Scope.defaultDeclarations = require("./global-keys");
+Scope.defaultDeclarations = flatten([globals.builtin, globals.browser, globals.node].map(Object.keys));
 
 Scope.prototype._add = function (node, references, throwOnDuplicate) {
   if (!node) return;

package.json

@@ -43,6 +43,7 @@
     "estraverse": "1.9.1",
     "esutils": "1.1.6",
     "fs-readdir-recursive": "0.1.0",
+    "globals": "^5.1.0",
     "js-tokenizer": "1.3.3",
     "lodash": "3.0.0",
     "output-file-sync": "1.1.0",