enhance type safety for websocket.js

[zeearth]

Since I wasn't sure what the standard was for typing (maybe I missed it—probably), I created two types. Feel free to resubmit the PR to standardize them using the preferred format ;)

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[fraxken]

@allcontributors please add @zeearth for code

[allcontributors]

@fraxken

I've put up a pull request to add @zeearth! 🎉