IE10 does not support Map (#325)

[xfields]

No description provided.

[codecov]

Codecov Report

Merging #326 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #326   +/-   ##
=======================================
  Coverage   96.21%   96.21%           
=======================================
  Files          27       27           
  Lines         132      132           
  Branches       39       40    +1     
=======================================
  Hits          127      127           
  Misses          4        4           
  Partials        1        1

Impacted Files	Coverage Δ
src/utils/isMap.js	100% <100%> (ø)	⬆️

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[heygrady]

You should use a polyfill in your project. A typical react app needs some polyfills.

Try adding this to the top of your entry point:

// @see https://reactjs.org/docs/javascript-environment-requirements.html
import 'raf/polyfill'
import 'core-js/modules/es6.map'
import 'core-js/modules/es6.set'

This PR should probably be about updating the README to let people know they need to supply polyfills for Map.

[xfields]

My project got en error (#325) on IE10 after I update redux-actions to 2.6.1.

I don't think it is a good idea to add a polyfill by whom use redux-actions, they may just don't need the Map class.

[heygrady]

Oh, I see. In this case Map isn’t used except as a type check. Your fix actually looks correct.

[timche]

Thanks 👍