conditional-types-over-overloads

SKILL.md

When a function's return type depends on its input type, you might reach for overload signatures. However, conditional types often provide a better solution. Unlike overloads, which are checked independently, conditional types distribute over unions and can be analyzed as a single expression. This makes them more powerful for handling union inputs and results in more maintainable type declarations.

Understanding when to use conditional types versus overloads is key to writing flexible, correct type signatures.

Prefer conditional types to overloaded signatures. Conditional types distribute over unions and provide more precise, maintainable type declarations.

在鍵入具有多種返回類型的函數時使用。當函數行為取決於輸入類型時使用。在處理聯合類型輸入時使用。在考慮函數重載時使用。 來源：marius-townhouse/effective-typescript-skills。

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