conditional-types-over-overloads

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.

Используйте при вводе функций с несколькими типами возврата. Используйте, когда поведение функции зависит от типа ввода. Используйте при работе с входными данными типа объединения. Используйте при рассмотрении перегрузок функций. Источник: marius-townhouse/effective-typescript-skills.