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<img src="https://user-images.githubusercontent.com/211411/34776833-6f1ef4da-f618-11e7-8b13-f0697901d6a8.png" height="100" />

[Github](https://github.com/LedgerHQ/ledgerjs/),
[Ledger Devs Slack](https://ledger-dev.slack.com/)

## @ledgerhq/hw-transport-webhid

Allows to communicate with Ledger Hardware Wallets.

**[Web]** **(WebHID)** – WebHID [check browser support](https://caniuse.com/webhid).

### FAQ: "DOM Exception" is triggered when creating the transport

The transport functions `create()` and `listen()` must be called in the context of an user interaction (like a **"click"** event), otherwise it fails with DOM Exception. This is by WebUSB design. You also must run on HTTPS.

### How to use this transport?

Please check `@ledgerhq/hw-transport-webusb` documentation because it is very similar paradigm.

### Support status

WebUSB is currently only supported on Google Chrome / Chromium DEV version and by explicitly enabling `chrome://flags/#enable-experimental-web-platform-features`

## API

<!-- Generated by documentation.js. Update this documentation by updating the source code. -->

#### Table of Contents

-   [TransportWebHID](#transportwebhid)
    -   [Parameters](#parameters)
    -   [Examples](#examples)
    -   [close](#close)
    -   [exchange](#exchange)
        -   [Parameters](#parameters-1)
    -   [isSupported](#issupported)
    -   [list](#list)
    -   [listen](#listen)
        -   [Parameters](#parameters-2)
    -   [request](#request)
    -   [openConnected](#openconnected)
    -   [open](#open)
        -   [Parameters](#parameters-3)

### TransportWebHID

**Extends Transport**

WebHID Transport implementation

#### Parameters

-   `device` **HIDDevice** 

#### Examples

```javascript
import TransportWebHID from "@ledgerhq/hw-transport-webhid";
...
TransportWebHID.create().then(transport => ...)
```

#### close

Release the transport device

Returns **[Promise](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise)&lt;void>** 

#### exchange

Exchange with the device using APDU protocol.

##### Parameters

-   `apdu` **[Buffer](https://nodejs.org/api/buffer.html)** 

Returns **[Promise](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Promise)&lt;[Buffer](https://nodejs.org/api/buffer.html)>** a promise of apdu response

#### isSupported

Check if WebUSB transport is supported.

#### list

List the WebUSB devices that was previously authorized by the user.

#### listen

Actively listen to WebUSB devices and emit ONE device
that was either accepted before, if not it will trigger the native permission UI.

Important: it must be called in the context of a UI click!

##### Parameters

-   `observer` **Observer&lt;DescriptorEvent&lt;HIDDevice>>** 

Returns **Subscription** 

#### request

Similar to create() except it will always display the device permission (even if some devices are already accepted).

#### openConnected

Similar to create() except it will never display the device permission (it returns a Promise&lt;?Transport>, null if it fails to find a device).

#### open

Create a Ledger transport with a HIDDevice

##### Parameters

-   `device` **HIDDevice** 

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