1 files changed, 14 insertions, 0 deletions
diff --git a/node_modules/es5-ext/math/atanh/shim.js b/node_modules/es5-ext/math/atanh/shim.js
new file mode 100644
index 000000000..9383e9714
--- /dev/null
+++ b/node_modules/es5-ext/math/atanh/shim.js
@@ -0,0 +1,14 @@
+"use strict";
+
+var log = Math.log;
+
+module.exports = function (value) {
+	if (isNaN(value)) return NaN;
+	value = Number(value);
+	if (value < -1) return NaN;
+	if (value > 1) return NaN;
+	if (value === -1) return -Infinity;
+	if (value === 1) return Infinity;
+	if (value === 0) return value;
+	return 0.5 * log((1 + value) / (1 - value));
+};