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docs: when extension is not present and app fails to load due to compose usage #773

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Troubleshooting info about extension absence causing undefined error …
Jan 7, 2021
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Jan 7, 2021
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17 changes: 17 additions & 0 deletions docs/Troubleshooting.md
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Expand Up @@ -109,3 +109,20 @@ const store = Redux.createStore(reducer, window.__REDUX_DEVTOOLS_EXTENSION__ &&
```

It will handle also date, regex, undefined, error objects, symbols, maps, sets and functions.

### Without browser extension installed, app fails to load

If your app fails to load without the browser extension installed, you are likely including your `window.__REDUX_DEVTOOLS_EXTENSION__ && window.__REDUX_DEVTOOLS_EXTENSION__()` in a `Redux.compose(...)`.

`__REDUX_DEVTOOLS_EXTENSION__` should be used only when it's the only enhancer, not to be included in the compose.

You should use `window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || compose` instead. Reference the [Advanced store setup](README.md#12-advanced-store-setup):

```
import { createStore, applyMiddleware, compose } from 'redux';

const composeEnhancers = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || compose;
const store = createStore(reducer, /* preloadedState, */, composeEnhancers(...)
```

See https://github.com/zalmoxisus/redux-devtools-extension/issues/320 for discussion.