• Type: undefined | true | PrefetchOption
type IncludeType = 'async-chunks' | 'initial' | 'all-assets' | 'all-chunks';

type Filter = Array<string | RegExp> | ((filename: string) => boolean);

interface PrefetchOption {
  type?: IncludeType;
  include?: Filter;
  exclude?: Filter;
  • Default: undefined

Specifies that the user agent should preemptively fetch and cache the target resource as it is likely to be required for a followup navigation. Refer to prefetch.

Boolean Type

When setting performance.prefetch to true, resources will be prefetched according to the following configuration:

  type: 'async-chunks',

Object Type

When the value of performance.prefetch is object type, the Builder will enable the prefetch capability for the specified resource according to the current configuration.


The type field controls which resources will be pre-fetched, and supports secondary filtering of specified resources through include and exclude.

Currently supported resource types are as follows:

  • async-chunks: prefetch all asynchronous resources (on the current page), including asynchronous js and its associated css, image, font and other resources.
  • initial: prefetch all non-async resources (on the current page). It should be noted that if the current script has been added to the html template, no additional pre-fetching will be performed.
  • all-chunks: prefetch all resources (on the current page), including all asynchronous and non-asynchronous resources.
  • all-assets: prefetch all resources, and resources of other pages will be included in the MPA scenario.


When you want to prefetch all image resources in png format on the current page, you can configure it as follows:

export default {
  performance: {
    prefetch: {
      type: 'all-chunks',
      include: [/.*\.png$/]