So siehts ganz gut aus !

node_modules/es5-ext/math/atanh/is-implemented.js

@@ -0,0 +1,7 @@
+"use strict";
+
+module.exports = function () {
+	var atanh = Math.atanh;
+	if (typeof atanh !== "function") return false;
+	return Math.round(atanh(0.5) * 1e15) === 549306144334055;
+};