So siehts ganz gut aus !

node_modules/es5-ext/math/acosh/implement.js

@@ -0,0 +1,8 @@
+"use strict";
+
+if (!require("./is-implemented")()) {
+	Object.defineProperty(Math, "acosh", { value: require("./shim"),
+		configurable: true,
+enumerable: false,
+writable: true });
+}

node_modules/es5-ext/math/acosh/index.js

@@ -0,0 +1,5 @@
+"use strict";
+
+module.exports = require("./is-implemented")()
+	? Math.acosh
+	: require("./shim");

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

@@ -0,0 +1,7 @@
+"use strict";
+
+module.exports = function () {
+	var acosh = Math.acosh;
+	if (typeof acosh !== "function") return false;
+	return acosh(2) === 1.3169578969248166;
+};

node_modules/es5-ext/math/acosh/shim.js

@@ -0,0 +1,12 @@
+"use strict";
+
+var log = Math.log, sqrt = Math.sqrt;
+
+module.exports = function (value) {
+	if (isNaN(value)) return NaN;
+	value = Number(value);
+	if (value < 1) return NaN;
+	if (value === 1) return 0;
+	if (value === Infinity) return value;
+	return log(value + sqrt(value * value - 1));
+};