While debugging, can I have access to the Redux st

问题:

I have unit tests for my reducers, as I'm supposed so have. However, when I'm debugging in the browser, I want to check if my actions have been called correctly and whether the state has been modified accordingly.

I'm looking for something like:

window._redux.store

... in the browser so I can type that on the console and check how things are going.

How can I achieve that?

回答1:

If you have react developer tools running you can use $r.store.getState(); with no changes to your codebase.

Note: You have to open the react devtool in your developer tools window first to make this work, otherwise you will get a $r is not defined error

1. open developer tools
2. click the React tab
3. ensure the provider node (or topmost node) is selected
4. then type $r.store.getState(); or $r.store.dispatch({type:"MY_ACTION"}) into your console

回答2:

let store = createStore(yourApp); window.store = store;

Now you can access the store from window.store in the console like this:

window.store.dispatch({type:"MY_ACTION"})

回答3:

You can use a logging middleware as described in the Redux Book:

/**
 * Logs all actions and states after they are dispatched.
 */
const logger = store => next => action => {
  console.group(action.type)
  console.info('dispatching', action)
  let result = next(action)
  console.log('next state', store.getState())
  console.groupEnd(action.type)
  return result
}

let createStoreWithMiddleware = applyMiddleware(logger)(createStore)

let yourApp = combineReducers(reducers)
let store = createStoreWithMiddleware(yourApp)

Alternatively, you could change the logging to just append to a global array (your window._redux) and you could look in the array when you needed information on a particular state.

回答4:

In case you would like to see store state for debugging you could do this:

#import global from 'window-or-global'
const store = createStore(reducer)
const onStateChange = (function (global) {
  global._state = this.getState()
}.bind(store, global))
store.subscribe(onStateChange)
onStateChange()
console.info('Application state is available via global _state object.', '_state=', global._state)

回答5:

If you're using Next JS, you can access the store by: window.__NEXT_REDUX_STORE__.getState()

You can also dispatch actions, just look at the options you have in window.__NEXT_REDUX_STORE__