Have you used the keyword 'infer' in your projects to determine types in TypeScript?

The infer keyword in TypeScript is used within conditional types to extract and infer types from other types. For example, it can be used to obtain the element type of an array or the return type of a function without explicitly specifying it. This is useful for creating more generic and flexible types.

Example of using infer to get the element type of an array:

type ElementType<T> = T extends (infer U)[] ? U : T;

type NumberArray = number[];
type NumberType = ElementType<NumberArray>; // NumberType will be number

In my projects, I have used infer to create utility types that automatically extract the needed types from complex structures, which simplifies maintenance and extension of the code.