4 files changed, 34 insertions, 0 deletions
diff --git a/node_modules/es5-ext/math/log2/implement.js b/node_modules/es5-ext/math/log2/implement.js
new file mode 100644
index 000000000..f1c04e096
--- /dev/null
+++ b/node_modules/es5-ext/math/log2/implement.js
@@ -0,0 +1,8 @@
+"use strict";
+
+if (!require("./is-implemented")()) {
+	Object.defineProperty(Math, "log2", { value: require("./shim"),
+		configurable: true,
+enumerable: false,
+writable: true });
+}
diff --git a/node_modules/es5-ext/math/log2/index.js b/node_modules/es5-ext/math/log2/index.js
new file mode 100644
index 000000000..d319caec4
--- /dev/null
+++ b/node_modules/es5-ext/math/log2/index.js
@@ -0,0 +1,5 @@
+"use strict";
+
+module.exports = require("./is-implemented")()
+	? Math.log2
+	: require("./shim");
diff --git a/node_modules/es5-ext/math/log2/is-implemented.js b/node_modules/es5-ext/math/log2/is-implemented.js
new file mode 100644
index 000000000..c70963f66
--- /dev/null
+++ b/node_modules/es5-ext/math/log2/is-implemented.js
@@ -0,0 +1,7 @@
+"use strict";
+
+module.exports = function () {
+	var log2 = Math.log2;
+	if (typeof log2 !== "function") return false;
+	return log2(3).toFixed(15) === "1.584962500721156";
+};
diff --git a/node_modules/es5-ext/math/log2/shim.js b/node_modules/es5-ext/math/log2/shim.js
new file mode 100644
index 000000000..51fcdae90
--- /dev/null
+++ b/node_modules/es5-ext/math/log2/shim.js
@@ -0,0 +1,14 @@
+"use strict";
+
+var log = Math.log, LOG2E = Math.LOG2E;
+
+module.exports = function (value) {
+	if (isNaN(value)) return NaN;
+	value = Number(value);
+	if (value < 0) return NaN;
+	if (value === 0) return -Infinity;
+	if (value === 1) return 0;
+	if (value === Infinity) return Infinity;
+
+	return log(value) * LOG2E;
+};