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Caches

Definition

caches: 'all' | Object

Tells to the plugin what to cache and how.

  • 'all': means that everything (all the webpack output assets) and URLs listed in externals option will be cached on install.
  • Object: Object with 3 possible sections (properties) of type Array<string | RegExp>: main, additional, optional. All sections are optional and by default are empty (no assets added).

Default: 'all'.

Advanced usage

Pass an Object to caches option to manually specify how to cache build assets.

Example:

caches: {
  main: [':rest:'],
  additional: [':externals:'],
  optional: ['*.chunk.js']
}

In this example assets which ends with .chunk.js are added to optional cache, external assets added to additional cache and rest of the assets are added to main cache.

Use special keyword :rest: to match all unused/uncached assets. To match multiple assets or assets with dynamic names, use pattern matching. To add external assets (from outside of your webpack build), list them in externals option and then use :externals: keyword in caches. If you don't want to put all externals into the same section, you can list those assets manually (e.g. additional: ['/external.js']) instead of using :externals: keyword.

Cache sections

  • main: Assets listed in this section are cached first (on install event in ServiceWorker) and if caching of this section fails -- no assets are cached at all. Hence, it should contain most important set of assets (for example ['index.html', 'main.js']), without which your website won't work.
  • additional: By default enabled only in ServiceWorker. Assets in this section are loaded after main section is successfully loaded (on activate event in ServiceWorker). If any of assets fails to download, then nothing is cached from the additional section and all the assets are moved to the optional section. If current update strategy is changed, then only failed to download assets are moved to the optional section, all other are successfully cached.
  • optional: By default enabled only in ServiceWorker. Assets in this sections are cached only when they are fetched from the server. ServiceWorker won't download them ahead of time.

Note: AppCache doesn't support conditional or delayed assets loading and by default ignores assets in additional and optional sections. To make AppCache cache all sections, set this option:

 AppCache: {
  caches: ['main', 'additional', 'optional']
 }