Function restartChild

lib/internal/main/watch_mode.js:190–192

({ trigger } = kEmptyObject)

async function init() {
  let child = start();
  const restartChild = async ({ trigger } = kEmptyObject) => {
    child = await restart(child, trigger);
  };
  watcher
    .on('changed', restartChild)
    .on('error', (error) => {