# Global variables

The global variables are all available in the `window` instances on browsers.

```typescript
interface Window {
  // Sentre
  sentre: {
    wallet?: import('@senswap/sen-js').WalletInterface
    lamports: import('@senswap/sen-js').Lamports
    splt: import('@senswap/sen-js').SPLT
    swap: import('@senswap/sen-js').Swap
  }
  // Utility
  notify: ({ type, description, onClick }: SentreNotification) => void
  message: ({ type, description, onClick }: SentreMessage) => void
}
```

## Global sentre

```typescript
window.sentre = {
  wallet?: import('@senswap/sen-js').WalletInterface
  lamports: import('@senswap/sen-js').Lamports
  splt: import('@senswap/sen-js').SPLT
  swap: import('@senswap/sen-js').Swap
}
```

{% hint style="info" %}
The following instances are from sen-js. See [sen-js APIs](https://descartesnetwork.github.io/sen-js/) for details.
{% endhint %}

| Property | Type                         | Description        |
| -------- | ---------------------------- | ------------------ |
| wallet   | WalletInterface \| undefined | Wallet instance.   |
| lamports | Lamports                     | Lamports instance. |
| splt     | SPLT                         | SPLT instance.     |
| swap     | Swap                         | Swap instance.     |

## Global notification

To create top-right notifications.

```typescript
window.notify = ({ type, description, onClick }: SentreNotification) => void

type SentreNotification = {
  type: 'error' | 'warning' | 'success' | 'info'
  description: string
  onClick?: () => void
}

window.message = ({ type, description, onClick }: SentreMessage) => void

type SentreMessage = {
  type: 'error' | 'warning' | 'success' | 'info' | 'loading'
  description: string
  onClick?: () => void
}
```

#### API

| Property    | Type                                           | Description                                                               |
| ----------- | ---------------------------------------------- | ------------------------------------------------------------------------- |
| type        | error \| warning \| success \| info \| loading | The notification type.                                                    |
| description | string                                         | The notification message.                                                 |
| onClick     | function \| undefined                          | The action that is activated when users click to the notification pop-up. |

#### Examples

```typescript
// To pop an error message on Coin98 connection failure
window.message({
  type: 'error',
  description: 'Coin98 Wallet is not connected.',
})

// To pop an warning notification on Phantom installation and direct to Phantom homepage
window.notify({
  type: 'warning',
  description: 'Phantom Wallet is not installed.',
  onClick: () => window.open('https://phantom.app/', '_blank'),
})
```


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