I haven't tried it directly myself but there is this project, Dragonfire, which looks quite reasonable using DeepSpeech:

https://github.com/DragonComputer/Dragonfire

There's a minimal demo app I put together here too: https://github.com/nmstoker/SimpleSpeechLoop

I've been using DeepSpeech to learn to build voice controls for all sorts of things in JavaScript. And I've got a way to connect it to the web so you'll be able write speech recognition enabled web pages using client side JavaScript.

https://github.com/jaxcore/deepspeech-plugin