This content originally appeared on 2ality – JavaScript and more and was authored by Dr. Axel Rauschmayer
The TypeScript handbook makes an interesting statement: “Often, the checks in a conditional type will provide us with some new information. Just like narrowing with type guards can give us a more specific type, the true branch of a conditional type will further constrain generics by the type we check against.”
In this blog post, we’ll see that this goes further than you may think.
This content originally appeared on 2ality – JavaScript and more and was authored by Dr. Axel Rauschmayer
Dr. Axel Rauschmayer | Sciencx (2025-02-23T00:00:00+00:00) The unexpected way in which conditional types constrain type variables in TypeScript. Retrieved from https://www.scien.cx/2025/02/23/the-unexpected-way-in-which-conditional-types-constrain-type-variables-in-typescript/
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