https://github.com/sebinsua/redux-saga-helpers

:ambulance: Error-handling for redux-saga.
https://github.com/sebinsua/redux-saga-helpers

errors functional-programming handlers redux-saga

Last synced: 2 months ago
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:ambulance: Error-handling for redux-saga.

• Host: GitHub
• URL: https://github.com/sebinsua/redux-saga-helpers
• Owner: sebinsua
• License: unlicense
• Created: 2016-09-03T20:40:53.000Z (over 8 years ago)
• Default Branch: master
• Last Pushed: 2016-10-07T11:37:54.000Z (about 8 years ago)
• Last Synced: 2024-04-25T17:20:42.080Z (8 months ago)
• Topics: errors, functional-programming, handlers, redux-saga
• Language: JavaScript
• Homepage:
• Size: 47.9 KB
• Stars: 23
• Watchers: 2
• Forks: 0
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# redux-saga-helpers

> Error-handling for `redux-saga`

This library provides a selection of small utilities to better handle sagas.

## Why?

- Following [the error-handling pattern recommended within the `redux-saga` docs]((https://yelouafi.github.io/redux-saga/docs/basics/ErrorHandling.html)) can lead to [code that silently swallows errors](https://github.com/yelouafi/redux-saga/issues/521) and that gives cryptic error messages. This is because [`redux-saga#put` effects cause `dispatch`es that might error](https://twitter.com/dan_abramov/status/770914221638942720) causing [corruption of React's internal state](https://twitter.com/dan_abramov/status/770918163965997056).

- Additionally JavaScript's try-catch syntax does not provide an easy way to catch specific errors.

## Install

```sh

npm install --save redux-saga-helpers

```

## Examples

### `toResult`

```js

import { call, put } from 'redux-saga/effects'

import { toResult } from 'redux-saga-helpers'

import { fetchProductSuccess, fetchProductError } from './actions'

function fetchProduct (id) {

  return fetch(`/products/${id}`)

}

export function * loadProduct () {

  const [ product, error ] = yield call(toResult(fetchProduct), 1)

  if (!error) {

    yield put(fetchProductSuccess(product))

  } else {

    yield put(fetchProductError(error))

  }

}

```

### `emitActions`

```js

import { createAction } from 'redux-actions'

import { call } from 'redux-saga/effects'

import { emitActions } from 'redux-saga-helpers'

function fetchProduct (id) {

  return fetch(`/products/${id}`)

}

export function * loadProduct () {

  // `emitActions(fetchProduct)` automatically generates a

  // `FETCH_PRODUCT_SUCCESS` or `FETCH_PRODUCT_ERROR` action.

  yield call(emitActions(fetchProduct), 1)

}

```

### `createEmitActions`

```js

import { createAction } from 'redux-actions'

import { call } from 'redux-saga/effects'

import { createEmitActions } from 'redux-saga-helpers'

function fetchProduct (id) {

  return fetch(`/products/${id}`)

}

export function * loadProduct () {

  const successAction = createAction('PRODUCT_REQUEST_RECEIVED')

  const errorAction = createAction('PRODUCT_REQUEST_FAILED')

  const emitProductActions = createEmitActions(successAction, errorAction)

  yield call(emitProductActions(fetchProduct), 1)

}

```

### `createBooleanCallHandler`

```js

import { createAction } from 'redux-actions'

import { call } from 'redux-saga/effects'

import { createBooleanCallHandler, toActionPutter } from 'redux-saga-helpers'

function fetchProduct (id) {

  return fetch(`/products/${id}`)

}

export function * loadProduct () {

  const successHandler = toActionPutter(createAction('PRODUCT_REQUEST_RECEIVED'))

  const errorHandler = toActionPutter(createAction('PRODUCT_REQUEST_FAILED'))

  const booleanCallHandler = createBooleanCallHandler(successHandler, errorHandler)

  yield call(booleanCallHandler(fetchProduct), 1)

}

```

### `createMatchAsCallHandler`

```js

import { call } from 'redux-saga/effects'

import { createMatchAsCallHandler } from 'redux-saga-helpers'

function fetchProduct (id) {

  return fetch(`/products/${id}`)

}

export function * loadProduct () {

  const okHandler = (value) => `${value} ${value}`

  const errHandler = (err) => err

  const authErrorHandler = (err) => `handle authentication errors: ${err}`

  const matchAsCallHandler = createMatchAsCallHandler({

    Ok: okHandler,

    Err: errHandler,

    AuthError: authErrorHandler

  })

  yield call(matchAsCallHandler(fetchProduct), 1)

}

```

### `match`

```js

import { call } from 'redux-saga/effects'

import { toResult, match } from 'redux-saga-helpers'

function fetchProduct (id) {

  return fetch(`/products/${id}`)

}

export function * testMatch () {

  const log = console.log.bind(console)

  const fetchProductAsResult = toResult(fetchProduct)

  const result = yield fetchProductAsResult(1)

  return yield match(result).as({

    Ok: (value) => call(log, `${value} ${value}`),

    Err: (err) => call(log, err),

  })

}

```