refactor: factor out async function detection helper

Signed-off-by: Jérôme Benoit <jerome.benoit@sap.com>

diff --git a/src/utils.ts b/src/utils.ts
index 1b657bce22acaf49a39552f411f1bc4899834777..f3952ab1746f559e780774b61520e099d7cdc310 100644 (file)
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -111,3 +111,15 @@ export const isKillBehavior = <KB extends KillBehavior>(
 ): value is KB => {
   return value === killBehavior
 }
+
+/**
+ * Detects whether the given value is an asynchronous function or not.
+ *
+ * @param fn - Any value.
+ * @returns `true` if `fn` was an asynchronous function, otherwise `false`.
+ */
+export const isAsyncFunction = (
+  fn: unknown
+): fn is (...args: unknown[]) => Promise<unknown> => {
+  return typeof fn === 'function' && fn.constructor.name === 'AsyncFunction'
+}

diff --git a/src/worker/abstract-worker.ts b/src/worker/abstract-worker.ts
index f291c52428fee35bd384a845945d64de8ee539e3..7d81a88ccc816803bcdcdae4f89cb9dd56486f51 100644 (file)
--- a/src/worker/abstract-worker.ts
+++ b/src/worker/abstract-worker.ts
@@ -7,7 +7,7 @@ import type {
   TaskPerformance,
   WorkerStatistics
 } from '../utility-types'
-import { EMPTY_FUNCTION, isPlainObject } from '../utils'
+import { EMPTY_FUNCTION, isAsyncFunction, isPlainObject } from '../utils'
 import {
   type KillBehavior,
   KillBehaviors,
@@ -154,7 +154,7 @@ export abstract class AbstractWorker<
     if (message.id != null && message.data != null) {
       // Task message received
       const fn = this.getTaskFunction(message.name)
-      if (fn?.constructor.name === 'AsyncFunction') {
+      if (isAsyncFunction(fn)) {
         this.runInAsyncScope(this.runAsync.bind(this), this, fn, message)
       } else {
         this.runInAsyncScope(this.runSync.bind(this), this, fn, message)