refactor: null -> undefined where appropriate

[poolifier.git] / examples / typescript / http-server-pool / express-cluster / src / main.ts

import { dirname, extname, join } from 'node:path'
import { fileURLToPath } from 'node:url'
import { FixedClusterPool, availableParallelism } from 'poolifier'
import type { WorkerData, WorkerResponse } from './types.js'

const workerFile = join(
  dirname(fileURLToPath(import.meta.url)),
  `worker${extname(fileURLToPath(import.meta.url))}`
)

const pool = new FixedClusterPool<WorkerData, WorkerResponse>(
  availableParallelism(),
  workerFile,
  {
    onlineHandler: () => {
      pool
        .execute({ port: 8080 })
        .then(response => {
          if (response.status) {
            console.info(
              // eslint-disable-next-line @typescript-eslint/restrict-template-expressions
              `Express is listening in cluster worker on port ${response?.port}`
            )
          }
          return undefined
        })
        .catch(error => {
          console.error('Express failed to start in cluster worker:', error)
        })
    },
    errorHandler: (e: Error) => {
      console.error('Cluster worker error:', e)
    }
  }
)