Unexpected token < error in react router component

Question

I\'m trying to write router component for my react app. I\'m create new react class and define some routes in componentDidMount method. This is full method

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Answer 1

do you have this into your package.json ?

"devDependencies": {
        "@babel/plugin-proposal-class-properties": "^7.7.4",
        "@babel/preset-react": "^7.0.0",
...
}

if yes -> do you have a .babelrc file ? if not :

add .babelrc file to your root application. and paste it into :

{
  "presets": ["@babel/preset-env", "@babel/preset-react"]
}

To finish installation : npm install and npm run dev

source : https://github.com/babel/babel-loader/issues/789#issuecomment-491554727