TypeScript Recursive Types in 2026: Modeling JSON, Trees, and Deep Partial Without Hitting the Limit This article was written with the assistance of AI, under human supervision and review. Most TypeScript codebases handle nested data—JSON responses, file trees, comment threads—by writing any or falling back to runtime validation. The compiler cannot protect operations on deeply nested structures because the types stop at one or two levels. When a frontend engineer fetches a config...