Yes, I dont knw what you mean by loading polyfills? I have imported the package on to my mian file. Can you please describe me by what you mean loading polyfills? I will create a sample app with my package.json file and upload in github in the mean time. But this is my package.json file I am using. Package.json { "name": "Nikhil", "version": "0.1.0", "private": true, "devDependencies": { "add-asset-html-webpack-plugin": "^2.0.1", "amdefine": "^1.0.1", "autoprefixer": "6.7. ", "babel-core": "^6.25.0", "babel-eslint": "^7.2.3", "babel-jest": "^20.0.3", "babel-loader": "^7.1.1", "babel-plugin-dynamic-import-webpack": "^1.0.1", "babel-plugin-syntax-dynamic-import": "^6.18.0", "babel-plugin-transform-runtime": "^6.23.0", "babel-preset-es2015": "^6.24.1", "babel-preset-react": "^6.24.1", "babel-preset-react-app": "2.2. ", "babel-preset-stage-0": "^6.24.1", "babel-preset-stage-2": "^6.24.1", "babel-runtime": "^6.23.0", "case-sensitive-paths-webpack-plugin": "^2.1.1", "chalk": "1.1. ", "connect-history-api-fallback": "1.3. ", "cpr": "^2.2.0", "cross-spawn": "4.0. ", "css-loader": "0.26. ", "detect-port": "1.1. ", "dotenv": "^4.0.0", "eslint": "3.19. ", "eslint-config-airbnb": "14.1. ", "eslint-config-react-app": "0.6. ", "eslint-loader": "1.6. ", "eslint-plugin-flowtype": "2.21. ", "eslint-plugin-import": "2.2. ", "eslint-plugin-jsx-a11y": "4.0. ", "eslint-plugin-react": "6.10. ", "extract-text-webpack-plugin": "^3.0.0", "file-loader": "0.10. ", "fs-extra": "0.30. ", "happypack": "^4.0.0-beta.1", "has-flag": "^2.0.0", "html-webpack-plugin": "^2.29.0", "http-proxy-middleware": "0.17. ", "jest": "^20.0.4", "json-loader" : "0.5._" , _ "locate-path": "^2.0.0", "object-assign": "4.1. ", "postcss-loader": "1.2. ", "preload-webpack-plugin": "^1.2.2", "promise": "7.1. ", "react-dev-utils": "^3.0.2", "react-error-overlay": "^1.0.9", "rimraf": "^2.6.1", "style-loader": "0.13. ", "url-loader": "0.5. ", "webpack": "^3.1.0", "webpack-dev-server": "^2.5.1", "whatwg-fetch": "2.0.2" },