Callbacks for preloading ad events.

| Properties ||
|---|---|
| `https://developers.google.com/admob/react-native/reference/interface/PreloadCallback#PreloadCallback.onAdFailedToPreload` |   |
| `https://developers.google.com/admob/react-native/reference/interface/PreloadCallback#PreloadCallback.onAdPreloaded` | Called when an ad has been successfully preloaded. |
| `https://developers.google.com/admob/react-native/reference/interface/PreloadCallback#PreloadCallback.onAdsExhausted` |   |

## Properties

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### `Optional` onAdFailedToPreload

`onAdFailedToPreload?: ((error) => void)`

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### `Optional` onAdPreloaded

`onAdPreloaded?: ((metadata) => void)` Called when an ad has been successfully preloaded.

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### `Optional` onAdsExhausted

`onAdsExhausted?: (() => void)`