+ delete this.opts.async
+ }
+
+ /**
+ * Checks if the `taskFunctions` parameter is passed to the constructor.
+ *
+ * @param taskFunctions - The task function(s) parameter that should be checked.
+ */
+ private checkTaskFunctions (
+ taskFunctions:
+ | WorkerFunction<Data, Response>
+ | TaskFunctions<Data, Response>
+ ): void {
+ if (taskFunctions == null) {
+ throw new Error('taskFunctions parameter is mandatory')
+ }
+ this.taskFunctions = new Map<string, WorkerFunction<Data, Response>>()
+ if (typeof taskFunctions === 'function') {
+ this.taskFunctions.set(DEFAULT_FUNCTION_NAME, taskFunctions.bind(this))
+ } else if (isPlainObject(taskFunctions)) {
+ let firstEntry = true
+ for (const [name, fn] of Object.entries(taskFunctions)) {
+ if (typeof fn !== 'function') {
+ throw new TypeError(
+ 'A taskFunctions parameter object value is not a function'
+ )
+ }
+ this.taskFunctions.set(name, fn.bind(this))
+ if (firstEntry) {
+ this.taskFunctions.set(DEFAULT_FUNCTION_NAME, fn.bind(this))
+ firstEntry = false
+ }
+ }
+ if (firstEntry) {
+ throw new Error('taskFunctions parameter object is empty')
+ }
+ } else {
+ throw new TypeError(
+ 'taskFunctions parameter is not a function or a plain object'
+ )
+ }