import launchEditor from 'react-dev-utils/launchEditor'; import launchEditorEndpoint from 'react-dev-utils/launchEditorEndpoint'; export default function createLaunchEditorMiddleware() { return function launchEditorMiddleware(req, res, next) { if (req.url.startsWith(launchEditorEndpoint)) { const lineNumber = parseInt(req.query.lineNumber, 10) || 1; launchEditor(req.query.fileName, lineNumber); res.end(); } else { next(); } }; }