Configring node js.

node_modules/core-js/library/modules/es6.number.to-precision.js

@@ -0,0 +1,18 @@
+'use strict';
+var $export      = require('./_export')
+  , $fails       = require('./_fails')
+  , aNumberValue = require('./_a-number-value')
+  , $toPrecision = 1..toPrecision;
+
+$export($export.P + $export.F * ($fails(function(){
+  // IE7-
+  return $toPrecision.call(1, undefined) !== '1';
+}) || !$fails(function(){
+  // V8 ~ Android 4.3-
+  $toPrecision.call({});
+})), 'Number', {
+  toPrecision: function toPrecision(precision){
+    var that = aNumberValue(this, 'Number#toPrecision: incorrect invocation!');
+    return precision === undefined ? $toPrecision.call(that) : $toPrecision.call(that, precision); 
+  }
+});