docs: function fork(mod, args, options) {
    if (!mod) throw new Error('Please specify a module to fork')
    const proc = /** @type {!_spawncommand.ChildProcessWithPromise} */ (forkCp(mod, args, options))
  
    const promise = getPromise(proc)
    proc.promise = promise
    /** @suppress {checkTypes} */
    proc.spawnCommand = proc['spawnargs'].join(' ')
    return proc
  }