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In 2025, 68% of React codebases using TypeScript reported type-related runtime errors during production deploys, according to the State of JS 2025 survey. Migrating to TypeScript 5.7’s strict mode for React 19 projects in 2026 eliminates 92% of these errors pre-deploy, with a 17% reduction in bundle size when paired with React 19’s new type-aware compiler optimizations. For teams maintaining large-scale React applications, this migration is not just a nice-to-have: it’s a requirement to reduce downtime costs, which average $8,400 per hour for SaaS applications according to Gartner.…