title: How to add jsconfig.json to existing vscode project w/o breaking it
body: <p>I have React project, currently not using <code>jsconfig.json</code> file.
  Recently I got the following warning message, when generating a build (yarn):</p>
  
  <blockquote>
    <p>Setting NODE_PATH to resolve modules absolutely has been deprecated in favor of setting baseUrl in jsconfig.json (or tsconfig.json if you are using TypeScript) and will be removed in a future major release of create-react-app.</p>
  </blockquote>
  
  <p>I saw "local fixes" to add base_url <a href="https://github.com/facebook/create-react-app/issues/5692" rel="noreferrer">here</a> <a href="https://github.com/facebook/create-react-app/pull/6656" rel="noreferrer">here</a>, but I am afraid it will break my build in  other places.</p>
  
  <p>What is the safest way to fix this issue in an existing project?
  What additional settings are required in <code>jsconfig.json</code>?
  Or should I not worry at all and ignore it?</p>