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4 files changed, 37 insertions, 0 deletions

diff --git a/node_modules/es5-ext/math/tanh/implement.js b/node_modules/es5-ext/math/tanh/implement.js
new file mode 100644
index 00000000..9e30d10d
--- /dev/null
+++ b/node_modules/es5-ext/math/tanh/implement.js
@@ -0,0 +1,8 @@
+"use strict";
+
+if (!require("./is-implemented")()) {
+	Object.defineProperty(Math, "tanh", { value: require("./shim"),
+		configurable: true,
+enumerable: false,
+writable: true });
+}
diff --git a/node_modules/es5-ext/math/tanh/index.js b/node_modules/es5-ext/math/tanh/index.js
new file mode 100644
index 00000000..7c45d988
--- /dev/null
+++ b/node_modules/es5-ext/math/tanh/index.js
@@ -0,0 +1,5 @@
+"use strict";
+
+module.exports = require("./is-implemented")()
+	? Math.tanh
+	: require("./shim");
diff --git a/node_modules/es5-ext/math/tanh/is-implemented.js b/node_modules/es5-ext/math/tanh/is-implemented.js
new file mode 100644
index 00000000..b17a1bc4
--- /dev/null
+++ b/node_modules/es5-ext/math/tanh/is-implemented.js
@@ -0,0 +1,7 @@
+"use strict";
+
+module.exports = function () {
+	var tanh = Math.tanh;
+	if (typeof tanh !== "function") return false;
+	return (tanh(1) === 0.7615941559557649) && (tanh(Number.MAX_VALUE) === 1);
+};
diff --git a/node_modules/es5-ext/math/tanh/shim.js b/node_modules/es5-ext/math/tanh/shim.js
new file mode 100644
index 00000000..974dd7cd
--- /dev/null
+++ b/node_modules/es5-ext/math/tanh/shim.js
@@ -0,0 +1,17 @@
+"use strict";
+
+var exp = Math.exp;
+
+module.exports = function (value) {
+	var num1, num2;
+	if (isNaN(value)) return NaN;
+	value = Number(value);
+	if (value === 0) return value;
+	if (value === Infinity) return 1;
+	if (value === -Infinity) return -1;
+	num1 = exp(value);
+	if (num1 === Infinity) return 1;
+	num2 = exp(-value);
+	if (num2 === Infinity) return -1;
+	return (num1 - num2) / (num1 + num2);
+};