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2.2.0 • Public • Published

Redux DevTools Instrumentation

Redux enhancer used along with Redux DevTools or Remote Redux DevTools.


yarn add @redux-devtools/instrument


Add the store enhancer:

import { createStore, applyMiddleware, compose } from 'redux';
import thunk from 'redux-thunk';
import devTools from 'remote-redux-devtools';
import reducer from '../reducers';

// Usually you import the reducer from the monitor
// or apply with createDevTools as explained in Redux DevTools
const monitorReducer = (state = {}, action) => state;

export default function configureStore(initialState) {
  const enhancer = compose(
    // other enhancers and applyMiddleware should be added before the instrumentation
    instrument(monitorReducer, { maxAge: 50 }),

  // Note: passing enhancer as last argument requires redux@>=3.1.0
  return createStore(reducer, initialState, enhancer);


instrument(monitorReducer, [options])

  • arguments
    • monitorReducer function called whenever an action is dispatched (see the example of a monitor reducer).
    • options object
      • maxAge number or function(currentLiftedAction, previousLiftedState) - maximum allowed actions to be stored on the history tree, the oldest actions are removed once maxAge is reached. Can be generated dynamically with a function getting current action as argument.
      • shouldCatchErrors boolean - if specified as true, whenever there's an exception in reducers, the monitors will show the error message, and next actions will not be dispatched.
      • shouldRecordChanges boolean - if specified as false, it will not record the changes till pauseRecording(false) is dispatched. Default is true.
      • pauseActionType string - if specified, whenever pauseRecording(false) lifted action is dispatched and there are actions in the history log, will add this action type. If not specified, will commit when paused.
      • shouldStartLocked boolean - if specified as true, it will not allow any non-monitor actions to be dispatched till lockChanges(false) is dispatched. Default is false.
      • shouldHotReload boolean - if set to false, will not recompute the states on hot reloading (or on replacing the reducers). Default to true.
      • trace boolean or function - if set to true, will include stack trace for every dispatched action. You can use a function (with action object as argument) which should return new Error().stack string, getting the stack outside of reducers. Default to false.
      • traceLimit number - maximum stack trace frames to be stored (in case trace option was provided as true). By default it's 10. If trace option is a function, traceLimit will have no effect, that should be handled there like so: trace: () => new Error().stack.split('\n').slice(0, limit+1).join('\n') (+1 is needed for Chrome where's an extra 1st frame for Error\n).



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npm i @redux-devtools/instrument

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  • methuselah96