perf: remove unneeded class indirection for dynamic pool in worker

[poolifier.git] / src / pools / pool-worker.ts

/**
 * Callback invoked if the worker has received a message.
 */
export type MessageHandler<Worker> = (this: Worker, m: unknown) => void

/**
 * Callback invoked if the worker raised an error.
 */
export type ErrorHandler<Worker> = (this: Worker, e: Error) => void

/**
 * Callback invoked when the worker has started successfully.
 */
export type OnlineHandler<Worker> = (this: Worker) => void

/**
 * Callback invoked when the worker exits successfully.
 */
export type ExitHandler<Worker> = (this: Worker, code: number) => void

/**
 * Interface that describes the minimum required implementation of listener events for a pool worker.
 */
export interface IPoolWorker {
  /**
   * Register an event listener.
   *
   * @param event - The event.
   * @param handler - The event listener.
   */
  on: ((event: 'message', handler: MessageHandler<this>) => void) &
  ((event: 'error', handler: ErrorHandler<this>) => void) &
  ((event: 'online', handler: OnlineHandler<this>) => void) &
  ((event: 'exit', handler: ExitHandler<this>) => void)
  /**
   * Register a listener to the exit event that will only performed once.
   *
   * @param event - `'exit'`.
   * @param handler - The exit handler.
   */
  once: (event: 'exit', handler: ExitHandler<this>) => void
}