问如何将产卵的ChildProcess返回到其他文件？

EN

const { spawn } = require('child_process');

class Ping {
    flags:  string[];

    constructor(flags: string[]) {
        this.flags = [...flags]
    }

    run() {
        const ping = spawn('ping', this.flags);

        ping.on('spawn', () => {
            return ping
        })
    }
}

export = Ping

const Ping = require('ping.js');

const duration = 5000;
const end_time = Date.now() + duration;
const flags = ['-t', 'stackoverflow.com'];
const ping = new Ping(flags)
const pingProcess = ping.run();

pingProcess.stdout.on('data', chunk => {
    console.log(chunk.toString())
})

while(true) {
  const current_time = Date.now();

  if (current_time > end_time) {
    pingProcess.kill()
    break;
  }
}