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1 files changed, 37 insertions, 0 deletions

diff --git a/node_modules/is-callable/index.js b/node_modules/is-callable/index.js
new file mode 100644
index 00000000..d9820b51
--- /dev/null
+++ b/node_modules/is-callable/index.js
@@ -0,0 +1,37 @@
+'use strict';
+
+var fnToStr = Function.prototype.toString;
+
+var constructorRegex = /^\s*class\b/;
+var isES6ClassFn = function isES6ClassFunction(value) {
+	try {
+		var fnStr = fnToStr.call(value);
+		return constructorRegex.test(fnStr);
+	} catch (e) {
+		return false; // not a function
+	}
+};
+
+var tryFunctionObject = function tryFunctionToStr(value) {
+	try {
+		if (isES6ClassFn(value)) { return false; }
+		fnToStr.call(value);
+		return true;
+	} catch (e) {
+		return false;
+	}
+};
+var toStr = Object.prototype.toString;
+var fnClass = '[object Function]';
+var genClass = '[object GeneratorFunction]';
+var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
+
+module.exports = function isCallable(value) {
+	if (!value) { return false; }
+	if (typeof value !== 'function' && typeof value !== 'object') { return false; }
+	if (typeof value === 'function' && !value.prototype) { return true; }
+	if (hasToStringTag) { return tryFunctionObject(value); }
+	if (isES6ClassFn(value)) { return false; }
+	var strClass = toStr.call(value);
+	return strClass === fnClass || strClass === genClass;
+};