## sveltekit-device-detector

![npm](https://img.shields.io/npm/dm/sveltekit-device-detector?label=npm%20downloads)

Detect device, and render view according to the detected device type.

## When to use this library

This library uses a technique called [user agent sniffing](https://developer.mozilla.org/en-US/docs/Web/HTTP/Browser_detection_using_the_user_agent) to detect device information. That means it works by examining the [User Agent string](https://en.wikipedia.org/wiki/User_agent) given by a browser and comparing it to a list of browser and device names it knows about. This technique works, but [has drawbacks](https://css-tricks.com/browser-detection-is-bad/) and may or may not be the right approach, depending on what you're trying to achieve. If you need to detect a specific browser type (e.g. Chrome, Safari, Internet Explorer) or specific category of device (e.g. all iPods), this library can do that.

## Flags

You can use these flags to detect the device type.

```js
interface DeviceType {
	isMobile: boolean;
	isBrowser: boolean;
	isAndroid: boolean;
	isIOS: boolean;
	isSmartTV: boolean;
	isConsole: boolean;
	isWearable: boolean;
	isEmbedded: boolean;
	isMobileSafari: boolean;
	isChromium: boolean;
	isTablet: boolean;
	isDesktop: boolean;
	isWinPhone: boolean;
	isChrome: boolean;
	isFirefox: boolean;
	isSafari: boolean;
	isOpera: boolean;
	isIE: boolean;
	osVersion: string;
	fullBrowserVersion: string;
	browserVersion: string;
	mobileVendor: string;
	mobileModel: string;
	getUA: string;
	isEdge: boolean;
	isYandex: boolean;
	isIOS13: boolean;
	isIPad13: boolean;
	isIPhone13: boolean;
	isIPod13: boolean;
	isElectron: boolean;
	isEdgeChromium: boolean;
	isLegacyEdge: boolean;
	isWindows: boolean;
	isMacOs: boolean;
	isMIUI: boolean;
	isSamsungBrowser: boolean;
	isWebView: boolean;
	isCrawler: boolean;
}

interface DevicePayload extends DeviceType {
	browserMajorVersion?: string;
	browserFullVersion?: string;
	browserName?: string;
	engineName?: string;
	engineVersion?: string;
	osName?: string;
	osVersion: string;
	userAgent?: string;
	vendor?: string;
	model?: string;
	os?: string;
	ua?: string;
}
```

## Installation

To install, you can use npm or yarn:

```
npm install sveltekit-device-detector --save

or

yarn add sveltekit-device-detector
```

Update your `app.d.ts` file to look something like:

```ts
import type { DevicePayload } from 'sveltekit-device-detector/dist/types';
// See https://kit.svelte.dev/docs#typescript
// for information about these interfaces
declare namespace App {
	interface Locals {
		deviceType: DevicePayload;
	}

	interface PageData {
		deviceType: DevicePayload;
	}

	interface Platform {}

	interface PrivateEnv {}

	interface PublicEnv {}
}
```

Create a +layout.server.js file at the root and returning the DeviceType from there.

```js
/** @type {import('./$types').LayoutServerLoad} */
export const load = ({ locals }) => {
	return {
		deviceType: locals.deviceType
	};
};
```

You'll now have access to the `deviceType` data by using `$page.data.deviceType` or via the `parent` function from other `+page.server.js` load functions.

```svelte
<script>
	import { page } from '$app/stores';
	$: deviceType = $page.data.deviceType;
</script>
```

### Initializing

> src/hooks.server.ts

```js
import { handleDeviceDetector } from 'sveltekit-device-detector';

// You can do it like this, without passing a own handle function
export const handle = handleDeviceDetector({});

// Or pass your handle function as second argument to handleDeviceDetector

export const handle = handleSession({}, ({ event, resolve }) => {
	// event.locals is populated with the deviceType `event.locals.deviceType`

	// Do anything you want here
	return resolve(event);
});
```

In case you're using [sequence()](https://kit.svelte.dev/docs/modules#sveltejs-kit-hooks-sequence), do this

```js
const deviceDetector = handleDeviceDetector({});
export const handle = sequence(deviceDetector, ({ resolve, event }) => {
	// event.locals is populated with the deviceType `event.locals.deviceType`
	// Do anything you want here
	return resolve(event);
});
```