polyfill for IE11

At the top of index.js, add:

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import "react-app-polyfill/ie11"; import "react-app-polyfill/stable";   //yarn add react-app-polyfill //yarn add babel-loader @babel/core --dev

and in package.json, add "ie 11" as below:

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"development": [      "last 1 chrome version",      "last 1 firefox version",      "last 1 safari version",      "ie 11"