nextTick

// packages/runtime-core/src/scheduler.ts
// see https://vuejs.org/api/general.html#nexttick
const resolvedPromise = /*#__PURE__*/ Promise.resolve() as Promise<any>
let currentFlushPromise: Promise<void> | null = null

function nextTick<T = void>(
  this: T,
  fn?: (this: T) => void
): Promise<void> {
  const p = currentFlushPromise || resolvedPromise
  return fn ? p.then(this ? fn.bind(this) : fn) : p
}