---
url: /api/symbols/workbox-swkit/precaching/precachefallbackplugin.md
---

# PrecacheFallbackPlugin

Class @vite-pwa/workbox-swkit/precaching

`PrecacheFallbackPlugin` allows you to specify an "offline fallback"
response to be used when a given strategy is unable to generate a response.

It does this by intercepting the `handlerDidError` plugin callback
and returning a precached response, taking the expected revision parameter
into account automatically.

Unless you explicitly pass in a `PrecacheController` instance to the
constructor, the default instance will be used. Generally speaking, most
developers will end up using the default.

## Constructor

```ts
new PrecacheFallbackPlugin(config: { fallbackURL: string; precacheController?: PrecacheController })
```

Constructs a new PrecacheFallbackPlugin with the associated fallbackURL.