From @rytisbac on Wed, 14 Nov 2018 07:57:33 GMT

Version v4.0.0-rc.12
Function fromJS.
example:
console.log(fromJS({test: 'qqq'}))
In most of the browsers it returns Map object, but IE11 returns the same object.
Other case:
console.log(fromJS([{test: 'qqq'}]))
In most of the browsers it returns List and Map as first element, but IE11 returns List and initial object.

Version 3.8.2 works as expected

Copied from original issue: immutable-js#1648