Configring node js.

node_modules/core-js/library/modules/es6.math.fround.js

@@ -0,0 +1,26 @@
+// 20.2.2.16 Math.fround(x)
+var $export   = require('./_export')
+  , sign      = require('./_math-sign')
+  , pow       = Math.pow
+  , EPSILON   = pow(2, -52)
+  , EPSILON32 = pow(2, -23)
+  , MAX32     = pow(2, 127) * (2 - EPSILON32)
+  , MIN32     = pow(2, -126);
+
+var roundTiesToEven = function(n){
+  return n + 1 / EPSILON - 1 / EPSILON;
+};
+
+
+$export($export.S, 'Math', {
+  fround: function fround(x){
+    var $abs  = Math.abs(x)
+      , $sign = sign(x)
+      , a, result;
+    if($abs < MIN32)return $sign * roundTiesToEven($abs / MIN32 / EPSILON32) * MIN32 * EPSILON32;
+    a = (1 + EPSILON32 / EPSILON) * $abs;
+    result = a - (a - $abs);
+    if(result > MAX32 || result != result)return $sign * Infinity;
+    return $sign * result;
+  }
+});