• 在安装babel的时候，遇到个**Error: Cannot find module '@babel/core’**问题，查了很多资料才解决，希望能够帮助到各位兄弟。

问题产生的原因

babel-loader和babel-core版本不对应所产生的，

• babel-loader 8.x对应babel-core 7.x
• babel-loader 7.x对应babel-core 6.x

如何解决

1、 卸载旧的babel-core
npm un babel-core
2、 安装新的babel-core
npm i -D @babel/core
3、 卸载旧的babel-preset
npm un babel-preset-env
npm un babel-preset-stage-0
4、 安装新的babel-preset
npm i @babel/preset-react
npm i @babel/preset-env
npm i babel-preset-mobx
5、 卸载旧的babel-plugin
npm un babel-plugin-transform-runtime
6、 安装新的babel-plugin
npm install --save-dev @babel/plugin-proposal-object-rest-spread
npm install --save-dev @babel/plugin-transform-runtime
npm install --save @babel/runtime
7、 修改.babelrc文件

{"presets": ["@babel/preset-env", "@babel/preset-react", "mobx"],"plugins": ["@babel/plugin-proposal-object-rest-spread","@babel/plugin-transform-runtime"]
}

• 如果你按上述命令安装完后，相应的版本应该如下图所示，问题也应该解决了。

"devDependencies": {"@babel/core": "^7.2.2","@babel/plugin-proposal-object-rest-spread": "^7.2.0","@babel/plugin-transform-runtime": "^7.2.0","@babel/preset-env": "^7.2.3","@babel/preset-react": "^7.0.0","babel-loader": "^8.0.4","babel-preset-mobx": "^2.0.0","css-loader": "^2.1.0","file-loader": "^3.0.1","popper.js": "^1.14.6","style-loader": "^0.23.1","url-loader": "^1.1.2","webpack": "^4.28.2","webpack-cli": "^3.1.2"},"dependencies": {"@babel/runtime": "^7.2.0","bootstrap": "^4.2.1","jquery": "^3.3.1"}