Object doesn't support property or method 'assign' - ie11 while using angular4

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i am using angular4 for my project, when i first encountered this error i found some blog which asked me to install object-assign and use in the project. so i installed object-assign using npm install object-assign --save command and refrenced it in the polyfill.ts file like this

import 'object-assign';
import 'core-js/es6/reflect';
import 'core-js/es7/reflect';

then i build the project using this command

ng build --prod --env=prod

but even after refrencing this file i am getting the error like this

enter image description here how can i solve this, did i miss something.

i am able to see the application in all other browser except IE11

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