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1 files changed, 32 insertions, 0 deletions

diff --git a/node_modules/is-generator-function/index.js b/node_modules/is-generator-function/index.js
new file mode 100644
index 00000000..306a299c
--- /dev/null
+++ b/node_modules/is-generator-function/index.js
@@ -0,0 +1,32 @@
+'use strict';
+
+var toStr = Object.prototype.toString;
+var fnToStr = Function.prototype.toString;
+var isFnRegex = /^\s*(?:function)?\*/;
+var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
+var getProto = Object.getPrototypeOf;
+var getGeneratorFunc = function () { // eslint-disable-line consistent-return
+	if (!hasToStringTag) {
+		return false;
+	}
+	try {
+		return Function('return function*() {}')();
+	} catch (e) {
+	}
+};
+var generatorFunc = getGeneratorFunc();
+var GeneratorFunction = generatorFunc ? getProto(generatorFunc) : {};
+
+module.exports = function isGeneratorFunction(fn) {
+	if (typeof fn !== 'function') {
+		return false;
+	}
+	if (isFnRegex.test(fnToStr.call(fn))) {
+		return true;
+	}
+	if (!hasToStringTag) {
+		var str = toStr.call(fn);
+		return str === '[object GeneratorFunction]';
+	}
+	return getProto(fn) === GeneratorFunction;
+};