How TypeScript 5.7's --module nodenext Changes Are Breaking Legacy Express Apps (and How to Fix Them) Most Express app TypeScript failures after upgrading to 5.7 stem from three enforcement changes in --module nodenext that break previously tolerated patterns. Teams discover this when builds that passed in 5.6 suddenly throw module resolution errors with no obvious code changes. The breaking point arrived when TypeScript 5.7 tightened nodenext mode to match Node.js's actual ESM/CommonJS behavior