What does the following ‘infer’ usage extract? type PromiseValue = T extends Promise ? PromiseValue : T;

Question

TypeScript Professional — Hard

What does the following ‘infer’ usage extract? type PromiseValue = T extends Promise ? PromiseValue : T;

Accepted Answer

The 'infer' usage in the given code snippet recursively unwraps nested Promise types until it reaches the inner non-Promise value type. This means it peels away layers of Promise wrappers to access the final non-Promise type.