Function defineAsyncComponent()

Define an async component which is lazy loaded
only when it is rendered.

function defineAsyncComponent(
  source: AsyncComponentLoader | AsyncComponentOptions
): Component

type AsyncComponentLoader = () => Promise<Component>

interface AsyncComponentOptions {
  loader: AsyncComponentLoader
  loadingComponent?: Component
  errorComponent?: Component
  delay?: number
  timeout?: number
  suspensible?: boolean
  onError?: (
    error: Error,
    retry: () => void,
    fail: () => void,
    attempts: number
  ) => any
}