fix AsyncResource.bind not using 'this' from the caller by default

Author: rochdev

lib/async_hooks.js

@@ -223,15 +223,18 @@ class AsyncResource {
     return this[trigger_async_id_symbol];
   }
 
-  bind(fn, thisArg = this) {
+  bind(fn, thisArg) {
     validateFunction(fn, 'fn');
-    const ret =
-      FunctionPrototypeBind(
-        this.runInAsyncScope,
-        this,
-        fn,
-        thisArg);
-    ObjectDefineProperties(ret, {
+    const runInAsyncScope = FunctionPrototypeBind(
+      this.runInAsyncScope,
+      this,
+      fn);
+    const bound = function (...args) {
+      return runInAsyncScope(
+        thisArg !== undefined ? thisArg : this,
+        ...args);
+    };
+    ObjectDefineProperties(bound, {
       'length': {
         configurable: true,
         enumerable: false,
@@ -245,7 +248,7 @@ class AsyncResource {
         writable: true,
       }
     });
-    return ret;
+    return bound;
   }
 
   static bind(fn, type, thisArg) {

test/parallel/test-asyncresource-bind.js

@@ -41,11 +41,16 @@ const fn3 = asyncResource.bind(common.mustCall(function() {
 fn3();
 
 const fn4 = asyncResource.bind(common.mustCall(function() {
-  assert.strictEqual(this, asyncResource);
+  assert.strictEqual(this, undefined);
 }));
 fn4();
 
 const fn5 = asyncResource.bind(common.mustCall(function() {
   assert.strictEqual(this, false);
 }), false);
 fn5();
+
+const fn6 = asyncResource.bind(common.mustCall(function() {
+  assert.strictEqual(this, 'test');
+}));
+fn6.call('test');