{"library":"redux-saga","title":"Redux Saga","description":"Redux-Saga is a middleware library for Redux, designed to manage application side effects (like asynchronous data fetching, accessing the browser cache, or impure actions) in a more organized and testable manner. It leverages ES6 Generators to make asynchronous flows look like synchronous code, improving readability and maintainability. The current stable version is 1.4.2, with patch releases occurring relatively frequently and minor versions every few months. Its key differentiators include its declarative effect model, powerful concurrency control patterns (e.g., `takeEvery`, `takeLatest`), and robust testing utilities, providing a structured alternative to Redux Thunk for complex side effect management.","language":"javascript","status":"active","last_verified":"Wed Apr 22","install":{"commands":["npm install redux-saga"],"cli":null},"imports":["import createSagaMiddleware from 'redux-saga';","import { takeEvery, put, call } from 'redux-saga/effects';","import type { Saga } from 'redux-saga';"],"auth":{"required":false,"env_vars":[]},"quickstart":{"code":"import { createStore, applyMiddleware } from 'redux';\nimport createSagaMiddleware from 'redux-saga';\nimport { takeEvery, put, call } from 'redux-saga/effects';\n\n// Reducer\nconst counterReducer = (state = { count: 0 }, action) => {\n  switch (action.type) {\n    case 'INCREMENT':\n      return { count: state.count + 1 };\n    case 'DECREMENT':\n      return { count: state.count - 1 };\n    default:\n      return state;\n  }\n};\n\n// Sagas\nfunction* incrementAsync() {\n  yield call(delay, 1000); // Simulate an async operation\n  yield put({ type: 'INCREMENT' });\n}\n\nfunction* delay(ms) {\n  return new Promise(res => setTimeout(res, ms));\n}\n\nfunction* rootSaga() {\n  yield takeEvery('INCREMENT_ASYNC', incrementAsync);\n}\n\n// Create saga middleware\nconst sagaMiddleware = createSagaMiddleware();\n\n// Create Redux store\nconst store = createStore(\n  counterReducer,\n  applyMiddleware(sagaMiddleware)\n);\n\n// Run sagas\nsagaMiddleware.run(rootSaga);\n\n// Dispatch actions\nstore.dispatch({ type: 'INCREMENT_ASYNC' });\nstore.dispatch({ type: 'INCREMENT' });\n\n// Log state changes\nstore.subscribe(() => console.log(store.getState()));\n","lang":"typescript","description":"This quickstart sets up a basic Redux store with `redux-saga` middleware. It demonstrates defining a simple counter reducer, creating an asynchronous saga using generator functions and effect creators (`call`, `put`, `takeEvery`), and running the saga with `sagaMiddleware.run()`.","tag":null,"tag_description":null,"last_tested":null,"results":[]},"compatibility":null}