const $userName = createStore('john')

const signIn = createEffect({handler: console.log})

const submitForm = createEvent()

​

const sampleUnit = sample(

  $userName /* 2 */,

  submitForm /* 1 */,

  (name, password) => ({name, password}) /* 3 */

)

/* 5 */

forward({

  from: sampleUnit,

  to: signIn,

})

​

submitForm(12345678)

// 1. when submitForm is called with params (12345678)

// 2. take $userName store`s state ('john')

// 3. transform payload from event (1) and current store`s state (2)

// 4. when sampleUnit (event in this case) is trigered,

//    send it payload to effect signIn with params received at the step (3)

​