Module not found: Error: Can't resolve 'core-js/es6'

Question

I've got a problem with my build process in relation to my React app.

I always get the following error:

Module not found: Error: Can't resolve 'core-js/es6'

if I use this in a polyfill.js:

import 'core-js/es6';

That is my package.json:

{    "name": "test",    "version": "1.0.0",    "main": "index.js",    "license": "MIT",    "private": true,    "devDependencies": {      "@babel/core": "^7.4.0",      "@babel/preset-env": "^7.4.2",      "@babel/preset-react": "^7.0.0",      "@babel/runtime": "^7.4.2",      "babel-loader": "^8.0.5",      "babel-preset-es2015": "^6.24.1",      "copy-webpack-plugin": "^5.0.2",      "css-hot-loader": "^1.4.4",      "eslint": "5.15.3",      "eslint-config-airbnb": "^17.1.0",      "eslint-loader": "^2.1.2",      "eslint-plugin-import": "2.16.0",      "eslint-plugin-jsx-a11y": "6.2.1",      "eslint-plugin-react": "7.12.4",      "file-loader": "^3.0.1",      "node-sass": "^4.11.0",      "prettier": "^1.16.4",      "react-hot-loader": "4.8.0",      "sass-loader": "^7.1.0",      "webpack": "^4.29.6",      "webpack-cli": "^3.3.0",      "webpack-dev-server": "^3.2.1"    },    "dependencies": {      "axios": "^0.18.0",      "core-js": "^3.0.0",      "prop-types": "^15.7.2",      "react": "^16.8.5",      "react-dom": "^16.8.5",      "react-redux": "^6.0.1",      "react-string-replace": "^0.4.1",      "redux": "^4.0.1",      "slick-carousel": "^1.8.1"    },    "scripts": {      "dev": "webpack-dev-server --hot",      "build": "webpack --colors --profile --progress --env.mode production",      "lint": "eslint ./src/ --ext .js,.jsx"    }  }

Can someone help here?

Answer 1

The imports have changed for core-js version 3.0.1 - for example

import 'core-js/es6/array'; and import 'core-js/es7/array';

can now be provided simply by the following

import 'core-js/es/array';

if you would prefer not to bring in the whole of core-js