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Overmind wraps objects and arrays in your state structure with proxies. If you pass state to 3rd party libraries, to a service worker or similar, you should pass a long a copy of that state. This avoids the 3rd party tool from mutating your state when you do not want it to.
import { json } from 'overmind'
const copy = json(someValue)
This function does a copy of any plain object or array, which are the only values that is wrapped with proxies. This ensures minimal work is done and keeps all other values alone.