TypeScript FSA utilities for redux-saga

Installation

npm install --save typescript-fsa-redux-saga-extended

API

bindAsyncAction(actionCreators: AsyncActionCreators): HigherOrderSaga

Creates higher-order-saga that wraps target saga with async actions, mainly based on typescript-fsa-redux-saga.

Main differences withtypescript-fsa-redux-saga:

• It is designed to work with takeLatest/takeEvery
• Accepts an action instead of a {params} object
• Does not throw any error (which would stop all sagas)
• Does not dispatch an started action. This avoids the need for a trigger action, because instead of having another dummy action just for triggering, you can use that started action as a trigger.
• Resulting saga dispatches only done/failed upon finish.

Example:

// actions.ts
import actionCreatorFactory from 'typescript-fsa';

const actionCreator = actionCreatorFactory();

// specify parameters and result shapes as generic type arguments
export const doSomething = actionCreator.async<
  { foo: string }, // parameter type
  { bar: number } // result type
>('DO_SOMETHING');

// saga.ts
import { SagaIterator } from 'redux-saga';
import { call } from 'redux-saga/effects';
import { doSomething } from './actions';

const doSomethingWorker = bindAsyncAction(doSomething)(function*(
  action,
): SagaIterator {
  const bar = yield call(fetchSomething, action.payload.foo);
  return { bar };
});

function* watchIncrementAsync() {
  yield takeLatest(doSomethingWorkerActionCreator.started, doSomethingWorker);
}