From c359c2dbec009859c2343e5b6cf3a32e23ddd340 Mon Sep 17 00:00:00 2001
From: John Simon <john@whatisaph.one>
Date: Thu, 12 Dec 2019 13:41:11 -0500
Subject: [PATCH] Fix the crash when hashing an `async` function

---
 index.js      |  2 +-
 test/index.js | 12 ++++++++++++
 test/types.js |  2 ++
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/index.js b/index.js
index a4f7222..90c2285 100644
--- a/index.js
+++ b/index.js
@@ -214,7 +214,7 @@ function typeHasher(options, writeTo, context){
         return write(object);
       }
 
-      if(objType !== 'object' && objType !== 'function') {
+      if(objType !== 'object' && objType !== 'function' && objType !== 'asyncfunction') {
         if(this['_' + objType]) {
           this['_' + objType](object);
         } else if (options.ignoreUnknown) {
diff --git a/test/index.js b/test/index.js
index 2c9cec0..ecff50a 100644
--- a/test/index.js
+++ b/test/index.js
@@ -219,6 +219,18 @@ describe('hash', function() {
     assert.notEqual(c,d, 'changing a property in the prototype changes the hash');
   });
 
+  it('distinguishes async functions based on their properties', function() {
+    var a, b;
+    
+    async function Foo() {}
+    a = hash(Foo);
+
+    Foo.foo = 22;
+    b = hash(Foo);
+
+    assert.notEqual(a,b, 'adding a property changes the hash');
+  });
+
   it('Distinguish objects based on their type', function() {
 
     function Foo() {}
diff --git a/test/types.js b/test/types.js
index d59e2e9..eb2274b 100644
--- a/test/types.js
+++ b/test/types.js
@@ -8,11 +8,13 @@ var validSha1 = /^[0-9a-f]{40}$/i;
 describe('hash()ing different types', function() {
   it('hashes non-object types', function() {
     var func = function(a){ return a + 1; };
+    var asyncFunc = async function(a){ return a + 1; };
     assert.ok(validSha1.test(hash('Shazbot!')), 'hash string');
     assert.ok(validSha1.test(hash(42)), 'hash number');
     assert.ok(validSha1.test(hash(NaN)), 'hash bool');
     assert.ok(validSha1.test(hash(true)), 'hash bool');
     assert.ok(validSha1.test(hash(func)), 'hash function');
+    assert.ok(validSha1.test(hash(asyncFunc)), 'hash async function');
   });
 
   it('hashes special object types', function() {