src: fix error message in async_hooks constructor

There are two minor issues in the AsyncHook constructor, if the object passed in has an after and/or destroy property that are not functions the errors thrown will still be: TypeError [ERR_ASYNC_CALLBACK]: before must be a function This commit updates the code and adds a unit test. PR-URL: #19000 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Matheus Marchini <matheus@sthima.com> Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
nodejs · jasnell · Jun 21, 2017 · Sep 25, 2017 · Jan 21, 2018 · Feb 11, 2018
commit 6456de8b948030ca4db5d74744a7fdaab7b83d60
diff --git a/lib/async_hooks.js b/lib/async_hooks.js
@@ -48,15 +48,15 @@ const {
 class AsyncHook {
   constructor({ init, before, after, destroy, promiseResolve }) {
     if (init !== undefined && typeof init !== 'function')
-      throw new errors.TypeError('ERR_ASYNC_CALLBACK', 'init');
+      throw new errors.TypeError('ERR_ASYNC_CALLBACK', 'hook.init');
     if (before !== undefined && typeof before !== 'function')
-      throw new errors.TypeError('ERR_ASYNC_CALLBACK', 'before');
+      throw new errors.TypeError('ERR_ASYNC_CALLBACK', 'hook.before');
     if (after !== undefined && typeof after !== 'function')
-      throw new errors.TypeError('ERR_ASYNC_CALLBACK', 'before');
+      throw new errors.TypeError('ERR_ASYNC_CALLBACK', 'hook.after');
     if (destroy !== undefined && typeof destroy !== 'function')
-      throw new errors.TypeError('ERR_ASYNC_CALLBACK', 'before');
+      throw new errors.TypeError('ERR_ASYNC_CALLBACK', 'hook.destroy');
     if (promiseResolve !== undefined && typeof promiseResolve !== 'function')
-      throw new errors.TypeError('ERR_ASYNC_CALLBACK', 'promiseResolve');
+      throw new errors.TypeError('ERR_ASYNC_CALLBACK', 'hook.promiseResolve');
 
     this[init_symbol] = init;
     this[before_symbol] = before;

diff --git a/test/parallel/test-async-hooks-constructor.js b/test/parallel/test-async-hooks-constructor.js
@@ -0,0 +1,23 @@
+'use strict';
+
+// This tests that AsyncHooks throws an error if bad parameters are passed.
+
+const common = require('../common');
+const async_hooks = require('async_hooks');
+const non_function = 10;
+
+typeErrorForFunction('init');
+typeErrorForFunction('before');
+typeErrorForFunction('after');
+typeErrorForFunction('destroy');
+typeErrorForFunction('promiseResolve');
+
+function typeErrorForFunction(functionName) {
+  common.expectsError(() => {
+    async_hooks.createHook({ [functionName]: non_function });
+  }, {
+    code: 'ERR_ASYNC_CALLBACK',
+    type: TypeError,
+    message: `hook.${functionName} must be a function`
+  });
+}