IE11 Support

[akarpas]

It seems the current setup of the boilerplate / webpack does not support IE11. The following error is produced:

IE: Error: Unable to get property 'apply' of undefined or null reference.

I tried updating the babel-polyfill but it seems nothing is working. Any advice?

[leonardomso]

Well, I think this might be a problem, don't know how to fix that yet 😐

[akarpas]

@leonardomso from a quick look (or 1-2 hours now 😄 ) I believe its the redux devtools, i changed it to this:

import { createStore, applyMiddleware } from 'redux';
import { composeWithDevTools } from 'redux-devtools-extension/developmentOnly';
import thunk from 'redux-thunk';
import logger from 'redux-logger';

import rootReducer from './reducers';

const middleware = applyMiddleware(thunk, logger);

// const reduxDevTools =
//     window.__REDUX_DEVTOOLS_EXTENSION__ &&
//     window.__REDUX_DEVTOOLS_EXTENSION__()

const store = createStore(
    rootReducer,
    composeWithDevTools(
        middleware
    )
);

export default store;

One other step I have taken (but which did not produce results) was to add a CDN script import in index.html to import polyfills
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-polyfill/7.4.4/polyfill.min.js"></script>

As I said this CDN was not fixing the issue, had to change the dev tools - but I am keeping it for backup, as i need my app to run on IE11. This was apparently suggested by a number of people.

[leonardomso]

Well, if you find any solution for this issue, feel free to send a PR, I'll love to merge

[eclectic-coding]

Okay, so I have been reviewing this issue some this morning.

From the Core-js repo:

@babel/polyfill IS just the import of stable core-js features and regenerator-runtime for 
generators and async functions, so if you load @babel/polyfill - you load the global version 
of core-js without ES proposals.

The problem, as you know, is the needed polyfill for legacy browsers. I do not have a way to test, since I do not have a IE11 system, but it looks like react-app-polyfill might be a good fit for the legacy systems. It would be as simple as installing the package, and including in the first line of src/index.js:

// This must be the first line in src/index.js
import 'react-app-polyfill/ie11';

[leonardomso]

Wow, thanks for that @eclectic-coding. I will see if I can find some time this week to do some upgrades in this boilerplate and include the react-app-polyfill for IE11 support. Thanks, man.