【React】これ。SyntaxError: 'import' and 'export' may only appear at the top level

webpack.config.js

///webpack.config.js変更前/////
    module: {
        loaders: [
            { test: /\.jsx?$/, exclude: /node_modules/,
                loaders: ['react-hot']
            }
        ]
    },
    
///変更後////
//add 'babel?presets[]=es2015&presets[]=react'
//if you not yet install npmpackage, npm i -D babel-preset-es2015 babel-preset-react

    module: {
        loaders: [
            { test: /\.jsx?$/, exclude: /node_modules/,
                loaders: ['react-hot', 'babel?presets[]=es2015&presets[]=react']
            }
        ]
    },