Use is-generator-function

Author: lukechilds

package.json

@@ -26,6 +26,7 @@
   "dependencies": {
     "inherits": "2.0.3",
     "is-arguments": "^1.0.4",
+    "is-generator-function": "^1.0.7",
     "object.entries": "^1.1.0"
   },
   "license": "MIT",

support/types.js

@@ -4,6 +4,7 @@
 'use strict';
 
 var isArgumentsObject = require('is-arguments');
+var isGeneratorFunction = require('is-generator-function');
 
 function uncurryThis(f) {
   return f.call.bind(f);
@@ -56,6 +57,8 @@ function isArgumentsObject(value) {
 }
 exports.isArgumentsObject = isArgumentsObject;
 
+exports.isGeneratorFunction = isGeneratorFunction;
+
 function isArrayBufferView(value) {
   return ArrayBufferSupported && ArrayBuffer.isView(value);
 }
@@ -214,11 +217,6 @@ function isAsyncFunction(value) {
 }
 exports.isAsyncFunction = isAsyncFunction;
 
-function isGeneratorFunction(value) {
-  return ObjectToString(value) === '[object GeneratorFunction]';
-}
-exports.isGeneratorFunction = isGeneratorFunction;
-
 function isMapIterator(value) {
   return ObjectToString(value) === '[object Map Iterator]';
 }