Design TypeScript generic functions whose type parameters infer cleanly at the call site, with proper constraints, defaults, and narrow return types instead of widened ones.
## CONTEXT In 2026, TypeScript generics are the foundation of every well-typed library, yet most hand-written generics either over-annotate (forcing callers to pass type arguments) or under-constrain (returning widened types like string instead of literal unions). The difference between a generic that "just works"…
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