Save hyperapp state across Parcel hot-module-reloads

app.js

let dispatch = app({...});

if (module && module.hot) {
    module.hot.dispose(function (data) {
        dispatch(function (state) {
            data.saved_state = state;
            return state;
        });
    });
    module.hot.accept(function (getParents) {
        dispatch(function (state) {
            return module.hot.data.saved_state;
        });
    });
}