Build recursive types like DeepPartial, DeepReadonly, JSON values, and tree structures that terminate safely within TypeScript's instantiation depth limits.
## CONTEXT Recursive types let TypeScript describe self-similar structures: JSON values, file trees, nested config, and deep transforms like DeepPartial and DeepReadonly. In 2026 they are everywhere, but they are also where TypeScript's instantiation depth limit (and tail-recursion rules) bite. A naive recursive type…
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