How to display JS error from source map in DOM
I think it can be done via AST (maybe as a babel plugin), you can explore it with AST explore.
If writing AST is too much, maybe redbox-react could help. It's a react component that accepts an error and displaying it in human friendly format on the screen.
import RedBox from 'redbox-react'const e = new Error('boom')const box = <RedBox error={e} />An edit from the OP
Here is the actual code I ended up using to get the rendering of the errors in the Google bot rendering in the index.js file
import React from 'react';import ReactDOM from 'react-dom';import App from './App';import RedBox from 'redbox-react'var errors = []window.addEventListener('error', function(e) { errors.push(e) const displayErrors = ( <ul> {errors.map(e => { return <li key={e.message}><RedBox error={e.error} /></li> })} </ul> ) const app = errors.length > 0 ? displayErrors : <App /> ReactDOM.render(app, document.getElementById('root'));});