Use variadic tuple types to type pipe, compose, curry, and rest-spread functions so argument counts and order are checked and the chained types flow correctly.
## CONTEXT Variadic tuple types (the [...T] spread in tuple positions) let TypeScript type functions that take or return variable-length, heterogeneous argument lists with full precision. In 2026 they are what make pipe, compose, curry, bind, and tuple manipulation fully type-safe. They are also some of the trickiest…
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