Do you need to access the stages of your thunks in easy-peasy? If yes, you are in the right place.

easy-peasy-thunk-stages allows you to augment your states adding the stage of all your thunks.

There are 2 ways of using this library:

1. Using the model thunkStagesModel. If you need to store stages for all thunk in a model.
2. Using the hook useThunkStage. If you want to wrap an existing thunk using a hook that will give you the correspondin stage.

About the hook: it doesn't persist the stage of the wrapped thunk in the store. It is just an experiment. This may change or it may live in a separate module.

Installation

npm i easy-peasy-thunk-stages

Example using the model

Given the following UsersModel containing 4 thunks.

interface UsersModel {
  fetch: Thunk<UsersModel>
  createUser: Thunk<UsersModel, User>
  updateUser: Thunk<UsersModel, User>
  removeUser: Thunk<UsersModel, User>
}

const userModel {
  fetch: thunk(...),
  createUser: thunk(...),
  updateUser: thunk(...),
  removeUser: thunk(...),
}

And your app need to known when any thunk is idle, busy, completed or failed.

With easy-peasy-thunk-stages you can have that information about your thunks' stages by doing 3 simple changes:

//                           1️⃣ Extends the interface.
//                           👇
interface UsersModel extends ThunkStagesModel<UsersModel> {
  fetch: Thunk<UsersModel>
  create: Thunk<UsersModel, User>
  update: Thunk<UsersModel, User>
  remove: Thunk<UsersModel, User>
}

const userModel {
  ...thunkStagesModel({   // 👈 2️⃣ Add the implementation.
    fetch: 'idle',
    create: 'idle',       // 👈 3️⃣ Initialize each thunk with a stage.
    update: 'idle',
    remove: 'idle',
  }),
  fetch: thunk(...),
  create: thunk(...),
  update: thunk(...),
  remove: thunk(...),
}

That's it! Now, you can access your thunk stages as follows:

const UsersPage = () => {
  const thunkStages = useStoreState($ => $.users.thunkStages)

  useEffect(() => {
    if (thunkStages.fetch === 'idle') {
      fetch()
    }
  }, [])

  if (thunkStages.fetch === 'busy') {
    return 'Loading...'
  }

  if (thunkStages.fetch === 'failed') {
    return 'Could not load users...'
  }

  return <UsersList users={users}>
}

Example using the hook

import { useThunkStage } from 'easy-peasy-thunk-stages'

const UsersPage = () => {
  const fetchUsers = useStoreState($ => $.users.fetchUsers)
  const [fetch, fetchStage] = useThunkStage(fetchUsers)

    useEffect(() => {
    if (fetchStage === 'idle') {
      fetch()
    }
  }, [])

  if (fetchStage === 'busy') {
    return 'Loading...'
  }

  if (fetchStage === 'failed') {
    return 'Could not load users...'
  }

  return <UsersList users={users}>
}

Tradeoff

Adding thunkStagesModel() will augment your model with the following properties: thunkStages, setThunkStage and setThunkStageOn.

As a consumer your app will be interacting with thunkStages. While the other two props are used by thunkStagesModel() to listen to all thunk and updates their stages.

Development

1. Clone this repository.
2. Install dependencies: npm i.
3. Run it locally: npm start or ./src/bin.js

Tests

npm run test

Releases

Releases are triggered by npm version and handled by GitHub Actions.