Function killApp

test/lib/next-test-utils.ts:640–656

(
  instance?: ChildProcess,
  signal: NodeJS.Signals | number = 'SIGKILL'
)

// Kill a launched app
export async function killApp(
  instance?: ChildProcess,
  signal: NodeJS.Signals | number = 'SIGKILL'
) {
  if (!instance) {
    return
  }
  if (
    instance?.pid &&
    instance.exitCode === null &&
    instance.signalCode === null
  ) {
    const exitPromise = once(instance, 'exit')
    await killProcess(instance.pid, signal)
    await exitPromise
  }
}

async function startListen(server: http.Server, port?: number) {
  const listenerPromise = new Promise((resolve) => {