Explanation of this code pls. And why I'm getting a error saying declaration or statement expected.

Question

SystemJS.config({
baseURL:'https://unpkg.com/',
defaultExtension: true,
meta: {
'*.jsx': {
'babelOptions': {
react: true
}
}
},
map: {
'plugin-babel': 'systemjs-plugin-babel@latest/plugin-babel.js',
'systemjs-babel-build': 'systemjs-plugin-babel@latest/systemjs-babel-browser.js',
'react': 'react@16.4.2/umd/react.production.min.js',
'react-dom': 'react-dom@16.4.2/umd/react-dom.production.min.js'
},
transpiler: 'plugin-babel'
});

SystemJS.import('index.js')
.catch(console.error.bind(console));