Function setImmediate

cf/polyfills.js:219–229

(fn)

}

function setImmediate(fn) {
  const id = ids++
  tasks.add(id)
  queueMicrotask(() => {
    if (tasks.has(id)) {
      fn()
      tasks.delete(id)
    }
  })
  return id
}

function clearImmediate(id) {
  tasks.delete(id)