const domainA = createDomain(‘formTypeA’)
const formTypeA = createForm(config)

const domainB = createDomain(‘formTypeB’)
const formTypeB = createForm(config)

const typeToModel = {
    typeA: domainA,
    typeB: domainA,
}

const create = createEvent()
const choose = createEvent<{id: string, type: typeA | typeB}>()

const clearFx = createEffect((scope: Maybe<Scope>) => fold(scope, noop, clearNode))

const forms = createStore<Map</*id*/string, Maybe<Scope>>>(Map())
    .on(create, map => map.set(uuid(), None))
    .on(choose, (map, {id, type}) => map.set(id, fork(typeToModel[type])))

sample({
    source: forms,
    clock: choose,
    fn => ($forms, {id}) => $forms.get(id, None),
    target: clearFx,
})