setupXkeysPanel WebHID method emits uncatchable error

[loucadufault]

Because setupXkeysPanel writes data to the device before it returns the Xkeys instance to the caller, it is impossible to attach an error event listener to handle an error thrown from sending the report:

xkeys/packages/webhid/src/methods.ts

Line 74 in 723cf1b

await xkeys.init()

https://github.com/SuperFlyTV/xkeys/blob/master/packages/core/src/xkeys.ts#L341-L350

The fix would be to:

• handle error events on the xkeys events during the init process
• return the instance to the caller and let them call init

[loucadufault]

Happy to PR. Probably the first approach makes the most sense to avoid a breaking change, and to maintain the all-in-one setup nature of the function.

[loucadufault]

For reference, the observed symptom in this case is that during setup (after firing the call to setupXkeysPanel), the page crashes with an uncaught (in promise) exception:

NotAllowedError: Failed to write the report

occurring due to an underlying call to this WebHID API which rejects:

https://developer.mozilla.org/en-US/docs/Web/API/HIDDevice/sendReport#notallowederror