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.

Backport-PR-URL: #22380
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>

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;

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`
+ });
+}