React Profiler for Gatsby

gatsby-node.js

// HAVE NOT TESTED, BUYER BEWARE
/*
 * Potential enhancements:
 * disable mangling to see component names
 * only do this with a certain env variable (e.g. PROFILE=true)?
 */
exports.onCreateWebpackConfig = ({
  actions,
}) => {
  actions.setWebpackConfig({
    resolve: {
      alias: {
        'react-dom$': 'react-dom/profiling',
        'scheduler/tracing': 'scheduler/tracing-profiling',
      }
    }
  })
}