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Composing Handlers?

See original GitHub issue

Hello, Is Is possible to using multiple levels of handler? for exmpale:

bot.onEvent(mainHandler)
const mainHandler = new LineHandler()
    .onFollow(async context => {
        return true
    }, followHandler)
    .onUnfollow(async context => {
        return true
    }, unfollowHandler)
    .onEvent(middleware([
        termAndServiceAgreement,
        isLoggedIn,
        eventHandlers
    ]))
    .onError(async (context, err) => {
        await context.sendText(err)
    })
    .onUnhandled(doNothing)

const eventHandlers = new LineHandler()
    .onEvent(async context => {
        const answer = 'somthing';
        switch (answer) {
            case case1:
                context([]);
                break;
            case case2:
                const anotherHandler = handler1.build()
                anotherHandler(context)
                break;
            default:
                // code
                doNothing()
        }
    })

const handler1 = new LineHandler()
    .onEvent(async context => {
        // do something
    })

I see there bottender-compose, but it seems i can’t do something in the second parameter, only send actions.

bot.onEvent(
  condition([
    [context => false, sendText('a')],
    [context => false, sendText('b')],
    [context => true, sendText('c')],
  ])
);

what if i i wanna check something in context.state and call 3r party services or pass to another event handler??

Thanks~~~